V" 3"1-5' u; 'v;-. 4 '.v D. 0 . .4.“ “.".""n 11.13.. p, {3"313g3313‘yfig1t-3‘.I" ‘ "1 f ‘. {‘1 '_ ' . THE INFLUENCE OF NITROGEN AND PLANT. POPULATIONS 0N SEVERAL CULTIVARS 0F PICKUNG CUC'UMBERS Thesis for the Degree of M. S. MICHIGAN STATE UNIVERSITY - CHRISTOPHER JOHN RAIZER - 1977 LIBRA ’{Y Midnbdn State nivcrsity ABSTRACT THE INFLUENCE OF NITROGEN AND PLANT POPULATIONS ON SEVERAL CULTIVARS OF PICKLING CUCUMBERS By Christopher John Rajzer Early and late plantings of several cultivars of pickling cucumbers Cucumis sativus L. were evaluated under various levels of preplant N and plant populations. Cultivars responded to treatments differently in fruit yields, sex expression, fruit set, and length to diameter ratios. Increasing nitrogen rates to 67 kg/ha increased yields (metric tons and dollars/ha) in the early planting only, and 101 kg/ha appeared to suppress yields in both plantings. High nitrdgen rates (67 and 101 kg/ha) reduced the percent cull fruit in the first planting. Increasing the plant populations increased yields only when N was sufficient. Increasing populations from 99,000 to 296,000 plants/ha increased the percent culls, but oversize fruit decreased with increasing plant populations. Yield was positively correlated to percent pistillate flowers and fruit number per vine. Cucumber plants and fruit were analyzed at harvest to determine the plant nutrient content and nutrient removal Christopher John Rajzer by fruit. Factors studied were time of planting, culti— vars, N levels, and plant populations. The mean plant nutrient content of N, P, and K was 103, 9, and 1&7 kg/ha, respectively, with mean nutrient removal of 22, 3, and 38 kg/ha, respectively. The nutrient levels of three cultivars were increased by added N and increasing plant populations. Nitrogen treatments influenced plant nutrient content. Yields and percent cull fruit were also affected. As plant population increased, both total nutrient con- tent in the plants and nutrient removal by fruit decreased. Nutrient removal from a field by cucumber fruit is about 25 percent of the total plant's content at harvest. THE INFLUENCE OF NITROGEN AND PLANT POPULATIONS ON SEVERAL CULTIVARS 0F PICKLING CUCUMBERS By Christopher John Rajzer A THESIS Submitted to Michigan State University in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE Department of Horticulture 1977 “vs I. MD 3: H. II A ‘1! “It 2; ACKNOWLEDGMENT I would like to express my sincere thanks and appre- ciation to Dr. H. C. Price for his counsel, assistance, and support during the course of my graduate program. I am most grateful to Drs. J. E. Motes, A. R. Putnam, M. J. Bukovac and M. M. Warncke for counsel and service on my guidance committee. My greatest indebtedness is to my wife, Dina, for her patience, understanding, and encouragement throughout my graduate studies. Guida 83.06 LP. “ .Llj I w‘ -Aa vet I” h “‘3 Guidance Committee: The Paper-Format was adopted for this thesis in accord— ance with Departmental and University regulations. The thesis body was separated into two sections. Both sections are intended for publication in The Journal of the American Sggjgty tor Horticultural Sgignge. iii "qu UHV POI" "v ‘ LJC TABLE OF CONTENTS Page LIST OF TABLES . . . . . . . . . . . . . . . . . . . . v LIST OF APPENDICES . . . . . . . . . . . . . . . . . . vi INTRODUCTION . . . . . . . . . . . . . . . . . . . . . 1 LITERATURE REVIEW. . . . . . . . . . . . . . . . 2 Nutritional Requirements of Cucumber. . . . . . . 2 Effect of Plant Population on Cucumber Growth . 7 Nutrient Uptake . . 8 Other Plant Responses to Nutrition . . . . . . . 11 SECTION ONE. THE INFLUENCE OF NITROGEN AND PLANT POPULATIONS ON SEVERAL CULTIVARS OF PICKLING CUCUMBERS I. FRUIT YIELDS . . . . . . . . . . . . . . 17 Abstract. . . . . . . . . . . . . . . . . . . . . 18 Introduction. . . . . . . . . . . . . . . . . . . 18 Materials and Methods . . . . . . . . . . . . . . 20 Results and Discussion. . . . . . . . . . . . . . 22 Literature Cited. . . . . . . . . . . . . . . . . 32 SECTION TWO. THE INFLUENCE OF NITROGEN AND PLANT POPULATIONS ON SEVERAL CULTIVARS OF PICKLING CUCUMBERS II. NUTRIENT CONTENT AND REMOVAL. . . . . . 34 Abstract. . . . . . . . . . . . . . . . . . . . . 35 Introduction. . . . . . . . . . . . . . . . . . . 35 Materials and Methods . . . . . . . . . . . . . . 36 Results and Discussion. . . . . . . . . . . . . . 37 Literature Cited. . . . . . . . . . . . . . . . . 46 APPENDICES . . . . . . . . . . . . . . . . . . . . . . #8 iv Lat. ~ 1 *4 k.) Table LIST OF TABLES Section One Effect of plant population, nitrogen and cultivar on vine and fruit characteristics: Early Planting . . . . . . . . . . . . . . Effect of plant population, nitrogen and cultivar on vine and fruit characteristics: Late Planting O O O O O I O I O O I O O O I Effect on sex expressions and fruiting habits: Early Planting. . . . . . . . Effect on sex expressions and fruiting habits: Late Planting . . . . . . . . Section Two Soil analyses at tip-over. . . . . . . . Nutrient content in fruit removed by harvesting for early planting. . . . . . . Nutrient content in fruit removed by harvesting for late planting . . . . . . . Plant nutrient content at harvest for early planting . . . . . . . . . . . . Plant nutrient content at harvest for late planting. . . . . . . . . . . . . . Page 31 41 45 Table A-1 A-2 A-3 A-A A-s A-6 A—8 A-9 A-10 A-11 A-12 A-13 A-IA A-15 A-16 A—17 A-18 A—19 A-20 LIST OF APPENDICES Early planting: Early planting: Early planting: at harvest. Early planting: Early planting: Early planting: Early planting: Weight (MT/ha) of fruit. . . Fruit wt. (g). . Other plant parameters Pistillate flowers per node. Staminate flowers per node . Blind flowers per node . . . Soil analyses. Dry weight (g) for early planting . Nutrient analyses on July 1. for early planting . Nutrient analyses on July 9, for early planting . Nutrient analyses in vines only on July 17-19. for early planting. . . . . . . . . . . Nutrient analyses in fruit on July 17—19. for early planting. Page 49 so 51 52 - 53 . 5A - 55 56 57 58 59 . 6O Nutrient analyses of vines and fruit on July 17-19. for early planting. o o o o o o o o o" o o o 0 Nutrient content on July 1, for early planting. Nutrient content on July 9, for early planting. Nutrient content in vines only on July 17-19. for early planting. . . . . . . . . . . . . . Late planting: Late planting: Late planting: harvest . . . Late planting: Weights (MT/ha) of fruit. . Fruit wt. (g) . . . Other plant parameters at Pistillate flowers per node vi . 61 62 . 63 . 64 65 66 . 67 68 Fun I. A“ f. :1— A- :1- Table Page A-21 Late planting: Staminate flowers per node . . . . . 69 A-22 Late planting: Blind flowers per node . . . . . . . 7O A—23 Late planting: Soil analyses. . . . . . . . . . . . 71 A—ZA Dry weights (g) for late planting. . . . . . . . . . 72 A-25 Nutrient analyses on August 24, for late planting. . 73 A-26 Nutrient analyses on September 1, for late planting . . . . . . . . . . . . . . . . . . . . . . 7h A-27 Nutrient analyses in vines only on September 13-17. for late planting . . . . . . . . . . . . . . 75 A-28 Nutrient analyses in fruit on September 13—17. for late planting. . . . . . . . . . . . . . . . . . 76 A-29 Nutrient analyses of vines and fruit on September 13—17, for late planting . . . . . . . . . 77 A-3O Nutrient content on August 24, for late planting . . 78 A-31 Nutrient content on September 1, for late plan-ting O O O C C C C O O C O O O C O O O O O C I O 79 A-32 Nutrient content in vines only on September 13-17, for late planting . . . . . . . . . . . . . . 80 A-33 Daily extreme and mean temperature data recorded from the Horticulture Research Station, East Lansing, MI . . . . . . . . . . . . . . . . . . 81 vii pt. \NJ 3 INTRODUCTION There are many factors influencing the yields of pickling cucumbers (Cucumi§_agtixg§ L.). Some of these factors are cultivars, nutrients, or plant populations which are somewhat controllable, or local environmental factors which are variable. Cultivars may respond differently to various fertilizers and plant population. The nutrient concentration of pickling cucum— bers varies with application of fertilizers, spacing, and the physiological age of plants. The invention of a mechanical once—over harvester aroused interest in new cultural practices. Plant populations changed to increase yields. Monoecious cultivars were replaced with earlier maturing cultivars which were predominantly female. Therefore, nutrient requirements and uptake by plants grown under these practices should be different. I The objective of this study was to examine the response of cultivars as well as the influence of plant populations and nitrogen, and how their main effects and interactions may be related to cucumber growth. sex expression, yields, and to evaluate plant and fruit nutrient contents. Fla (1'. L; LITERATURE REVIEW Hoglund (1958) stated that there are many factors that can interact to influence the overall yield of pickling cucum- bers. These determinate factors are local environment over which we have little control, cultivars and nutrition, as well as plant populations which man can alter to influence yield. Before the early 60's most of the pickling cucumbers were harvested by hand several times throughout the growing season. About this time a once-over machine harvester was developed that required higher plant populations and different fertilizer rates to obtain maximum yields. The literature does not provide adequate information on optimum growth determinates and their interaction for machine harvested cucumbers. However, it does describe the responses of the pickling cucumber plants to several growth factors. Nutritienal Requirements 9: Cnepmbez One of the earliest studies on nutritional requirements of pickling cucumbers was by Magrude (1933) in southern Ohio. After a long study, he indicated that cucumbers benefitted from the application of 1.0 T/A of limestone and the application of manure yearly. Magrude did not report on the pH of the soil nor the organic matter content but one might suspect that it was sandy acidic soil. When commercial fertilizers became 2 C‘. ".2” w- 1.4 available, researchers compared their effectiveness to established practices. This led to Comin and Bushnell's (1928) work with slicing cucumber. With the application of lime during the early years of their experiment, no increase in yield was observed even though the initial pH was 5.6. A marked increase in yield was recorded with the use of 77 lb/A of N supplemented with superphosphate. With the application of 160 lb/A of N (nitrate of soda) and manure, yields were still greatly increased with no indication of leveling off. K application was not profitable and only small quantities of P were needed. In contrast, two years later, Bushnell (1930) reported that his cucumber crop showed the highest response to K and that this had now become the limiting element. With the development of complete fertilizers, nutrition studies became more numerous. Seaton et al. (1936) indicated that 16 T/A of manure gave a slightly better yield than 1220 lb of 4-10-4 fertilizer. Two years later in New York, Dearborn (1936) had the foresight to see that commercial fertilizers would some day become an important tool to vegetable growers. He observed that high N levels increased vegetative growth and fruit size of cucumbers. Anderson (l9h1) recommended 800 to 1000 lb/A of 6-8-8 for land not previously cropped, and 800 to 1000 lb of 6-8-12 for land already in production. No specific amount of supplemen— tary nitrogen was recommended, although its use was suggested. Later, Anderson (19h3) indicated increased yields were received with 500 and 1000 lb/A of 6-8-6 fertilizer with little diff- erence between rates. More recent work by Wittwer and Tyson (1950) from a fertilizer trial at three locations in Michigan concluded that a band application of 500 lb/A of 3-12-12 would be profitable on fertile soils, and that the application of N was beneficial only on poorly drained soils. They concluded that fertile soils needed smaller amounts of fertilizer, than previously reported, in the area of 500 lb/A of 3-12-12 to obtain yields of 237 Bu/A. Soils of low fertility produced lower yields, however, they could produce up to 200 Bu/A with applications of 800 1b/A of 3-12—12. Where drainage is poor, nitrigication is low, or if sod is plowed down, one should side dress with 200 lb/A of ammonium nitrate, and for better earlier growth and production, band placement of fertilizer should be practiced. For higher late season yields, fertilizer should be broadcasted. Comparing growth responses to various levels of ferti— lizer in Maryland, Reynolds (195A) was unable to observe any different responses in yield of pickling cucumbers. In Michi— gan, Miller (1957) noted that 200 and A00 lb/A of 5-20-20 placed 2 inches under the seed would reduce stand and yields. This was one of the first studies on the effects of fertilizer placement for pickling cucumbers. He also reported that 100 lb/A of K20 depressed yields. The highest yields were ob— tained with 100 or 200 lb/A of 5-20-20 fertilizer placed 2 inches to the side and below the seed or with 300 lb/A of 5-20-20 broadcasted before planting. A more intensified nutritional study by Ries and Carolus (1959) indicated that 20 1b/A of N and 80 to 160 lb/A of P o 2 5 lb '11-. '7:& “AU (38 L17 with 80 1b of K20 would produce yields of over A00 Bu/A. With 160 lb/A of P205 compared to 80 lb/A, no reduction in yields was observed. They concluded that soil potassium levels of 150 to 200 lb/A K20 would be sufficient. Good yields (361 to AAO Bu/A were obtained by broadcasting A00 lb/A of 5-20-20 fertilizer prior to planting. In the 1960's, the invention of a mechanical once—over harvester aroused interest in new cultural practices. In Canada, Bishop (1960) with a complex study found P is of more relative importance than either N or K. He also found that yields were not always increased but were never decreased by N, P, or K. By the early 1970's, most of the research dealt with ex- cess minerals decreasing yields. In North Carolina, McCollum and Miller (1971) studied different rates of N, P, and K only to find that few of the yield differences were assignable to treatments. Postitive yield trends from the addition of in- creasing increments of N and K20 up to 80 lb/A and for P205 up to 63 lb/A were observed. Bishop et a1. (1969) reported that at 3 locations there were variable yields without applied N. However, at 2 of these locations, yields were not significantly increased with additional N, but were significantly decreased by more than 56 kg/ha. It is an important observation that yields can be decreased without an observed reduction in plant growth. At the Piedmont Substation in Alabama, Johnson et a1. (1973) concluded that responses to N fertilizer were variable depending on soil area and fertility. Added P205 provided large here N‘ni \_.' .1 a dre r. -IZI 111) a: U} 6 increases in yield with increasing increments at several different locations. K20 gave indications of yield in- creases. Downes and Lucas (1966) have also reported yield responses from applied K which quantitatively is the pre- dominate element in cucumbers according to Ward (1967). Cantliffe (1977) reported the results of a 3 year study which supported earlier findings. His work dealt only with N applied in the form of urea or ammonium nitrate, side- dressed or broadcasted on plantings for once-over harvesting. The use of N rates of 67 or 134 kg/ha increased yields with no differences between forms. These findings are similar to those of McCollum and Miller (1971) and Bishop et al. (1969) and McCall et al. (1958) who obtained maximum yields with 50 kg/ha and 56 kg/ha respectively of N. The results of extra side dressing showed basically no benefit as Ries and Carolus (1958) also reported. Cantliffe (1977) concluded that applications of 67 to 13A kg/ha of N broadcasted and incorporated into the soil would produce maxi- mum yields for once-over harvesting of pickling cucumbers. The nutrient requirements for the gynoecious hybrid pick- ling cucumbers appear different than those of the monecious cultivars. Motes (1975) indicated that hybrid cucumber cultivars which mature in 50-60 days require less nitrogen than monecious cultivars which were hand harvested over longer periods of time. There is a variation in fertilizer recommendations and responses of pickling cucumbers. However, we can conclude from these readings that much of the variation is due to the I “re .u’». C R A: i a. . a wl. «5 ad Y; s. . J . ..< . HMS ...- vi n“ n. 1 a- A O 5.. .1- S A.» P... r we. ab w c. .l i. 0 9w .. . T. H4 C r. N :¢ C M 1 &L a a» n0 . V . 7 initial soil fertility, cultural practices, or local envir- onmental effects. Furthermore, N may not be the main limit- ing factor to yields. It is the one element most commonly over-applied that results in a reduction of yields. If P205 and K 20 are at adequate levels in the soil, less variation in yields will be observed. Effegt of Plant Population Qn Cucumber Growth With the adoption of mechanical harvesting, plant pop- ulations have been increased drastically to obtain yields comparable to hand harvesting. Banadyga (19A9) summarized research on spacing of hand-picked cucumbers as follows: "Varying results have been obtained with spacing tests. It is recognized that rows should be 5 to 7 ft. apart, but much controversy exists on the spacing of plants in the rows." Three years later, Ware et al. (1953) conducted a spacing trial with rows 3 ft. apart and plants 12, 2A, and 36 inches apart in the row. With no supplemental irrigation, the high— est yields were obtained from the 12 inch spacing. A 3 year spacing trial by Ries (1957) reported that with spacings of 6, 12, 18, and 2A inches apart in 5 ft. rows, yields were highest at the 6 inch spacing with no differences between 12 and 18 inches. Yields were lower with the 24 inch spacing. Plots were harvested by hand and higher yields were due primarily to higher earlier yields. In a later planting, there was no effect of plant density on yields. When even higher plant densities were observed, it seemed as if there was no limit that would result in increased yields. (L Putnam (1963) evaluated populations for once—over harvest- ing varying from 22,000 to 87,000 plants/A. The highest yields with greatest number of fruit per plant were from a 1 ft. spacing irregardless of the distance between rows. Morrison et al. (1967) with similar work indicated that plant populations of 77,800 plants/A at 9 inch spacing in 9 inch rows consistently produced the highest dollar value. Cantliffe et al. (1975) observed two different cultivars under 8 populations ranging from 50,000 to 850,000 plants/ha. Yields as dollar and tonnage/ha increased with populations of 50,000 to 100,000 and 250,000 to 500,000 plants/ha. Delaying harvest for A days doubled the tonnage but did not affect the dollar value with both cultivars reacting similarly. Cantliffe (1977) reported that in a fertilizer study, the mean yield in dollars/ha was higher at 450,000 plants than at 250,000 plants/ha. With the application of nitrogen, an increase in plant density will increase both tonnage and dollar yield. However, there is much more controversy on the limits one can go with density. It appears there may be interactions between the nitrogen and population levels. Nutrient Uptake Some of the first chemical analyses of cucumbers were performed by Wilkins (1917). He showed that Ca was 10 times higher in vines than in the fruit, with Mg only 2 to 3 times higher. P content was slightly higher in the fruit compared u xii. 9 to vines whereas K and N levels were similar in both. Friedrich and Schmidt (l954)analyzed plants every 10 days for N, P, K, Ca and Mg. They found that there was a high Ca content in the leaves. N was stored in leaves as protein, and the fruit contained high amounts of soluble N. There was a large increase in nutrient uptake during the flowering and fruiting phase. Campbell (1953) found that Ca levels in pickling cucum- ber vines were not changed by soil applications of Ca, but the K levels would increase with added K. Reynolds (1954) growing cucumbers under varying rates of N, P, K, Ca, and Mg observed significant differences in the amounts of all of these elements except N in the leaves and fruit. Ries (1957) in a spacing trial, observed an inverse corre- lation between spacing and concentration of NOB—N in cucumber petioles. He also observed that P would increase in plant tissue as spacing and N levels decreased. Petiole K levels were higher in low fertilized plots (300 lb/A of 12-12-12 plus side-dressing 100 lb/A of NH”) than those with a higher ferti- lization rate. In the higher fertilized plot (300 lb/A of 12-12-12 plus side-dressing 200-275 lb/A of 12-12-12), K increased in the petiole as spacing increased. Miller (1957) found an inverse relationship between the soluble N and soluble P in cucumbers. Both nutrients increased in the petioles during the season. The largest yields were associated with moderate levels of soluble NOB-N (892 ppm) and P (59 PPm) in petioles at harvest. Mg increased sharply 1.: “C Pe‘ harve erit 10 as the season progressed. In a study of the nutrient levels in laminae and petioles of cucumbers grown at low populations for multiple harvesting, Bishop et al. (1969) found the yield response to applied P205 to be of much greater relative importance than applied N or K 0. The study indicated that N and 2 K 0 each at 50 kg/ha and P at 100 kg/ha would be adequate. 2 205 El-Sheikh and Broyer (1970) reported that total N content was less satisfactory than N03-N content to determine critical N concentration for Optimum growth. Cantliffe (1977) indicated that total N within the blade or petiole of pick- ling cucumbers did not appear to be a good indicator of yields, but highest yields were obtained when the leaf blade contained from 4 to 5% total N. The concentration of N03—N in leaf blade and petiole tissue rapidly decreased during the fruit sizing period. When preplant and side dress N fertilizers were used, this led to an increased tissue concentration of NOB-N and total N. The source of N fertilizer had little influence on tissue concentration. The tissue concentration of K, Ca, Mg, Fe and Mn were higher in tissue when treated prior to planting with 67 to 207 kg/ha of N. McCollum and Miller (1971) found that after 72 days the N, P, and K uptake by cucumber plants was 90, 12, and 145 lb/A respectively. The nutrient fruit removal with multiple harvesting was 40 lb N, 6 lb P, and 55 lb K/A with yields of 8.7 to 11.9 T/A. The maximum rate of growth and nutrient accumulation occurred about 50 days after seeding. (j 11 With once-over harvesting, plants generally take only 50 days to obtain maximum dollar yields. If the plants are grown for shorter periods of time, nutrient content and requirements should vary. However, there are no indications of research in this area. Other Plant Responses to Nutrition Reynolds and Stark (1953) reported that in comparing growth response to N, Ca, K, and Mg, N levels produced the greatest effect on vegetative growth. The greatest number of fruit occurred on plants receiving a medium supply of N compared to very low or high amounts. Similar results were reported earlier by Dearborn (1936) and Cantliffe (1977). while Tiedjens (1926) found that high N improved fruit shape. Cantliffe (1975) observed that the number of fruit per plant decreased with increasing plant populations. However, varying the pop- ulation did not affect fruit shape or color. Miller (1957) in a greenhouse study, found that high amounts of N increased the length to diameter ratio of fruit. Cantliffe et a1. (1975) reported that with "Premier" the length to diameter ratio (L/D) was decreased at lower plant populations. N levels have also been found to affect sex expression of cucumbers. Dearborn (1936) indicated that high N supply produced more pistillate flowers. Miller (1957) reported that both pistillate and staminate flower production were increased. However, the staminate to pistillate ratio was decreased with high N levels. Vaile (1938, 1942) indicated that the set and 12 number of marketable fruits were greater under high as compared to low nutrient conditions. Reynolds and Stark (1953) reported that the dry weight of cucumber plants grown on sand increased with increasing increments of N, but there were more fruit at the medium N level. Cantliffe (1977) reported that the addition of preplant N up to 134 kg/ha resulted in a greater number of pistillate flowers per plant. However, the percent of off—shape fruits were also highest for the highest N treatment, while L/D ratios were not influenced. Similar results were reported by Lloyd and McCollum (1940). It appears that both nutrient levels and plant populations can influence the quality of the cucumber fruit under different local environmental conditions. 10. LITERATURE CITED Anderson, W. S. 1941. Growing cucumbers for pickling in Mississippi. Miss. Agn. Exp, Sta, Bug. 355:1-17 Anderson, W. S. 1943. Close spacing, medium fertilizer rate most profitable for pickling cucumbers. Miss. Farm Res. 6(3):8, March. Banadyga, A. A. 1949. Cucumbers for Pickles. Net. Pjekle Peckens Assoo., Oak Park, Ill. 276 pp. Bishop, R. F., E. W. Chipman and C. R. MacEachern. 1969. Effect of nitrogen, phosphorus and potassium on yields and nutrient levels in laminae and petioles pickling cucumbers. C J S ' S '. Vol. 49, 297-304. Bushnell, J. 1930. The relative response to fertilizer of cabbage, tomatoes, cucumbers, and sweet corn. Pnee, Amen, See, Her, Sei. 27:515—519 Bushnell, J. 1941. Fertilizers for early cabbage, toma- toes, cucumbers, and sweet corn. Onje Agzl Exp, Sta. Bul. 622 Campbell, J. D. 1953. Differential cation absorption and yield response by vegetable crops grown at vari- ous levels of calcium, potassium and sodium. Ph.D. Thesis. Michigan State College. 163 pages. Cantliffe, D. J. 1977. Nitrogen fertilizer requirements of pickling cucumbers grown for once-over harvest I. Effect on yield and fresh quality. JI Amen, See, Hort. 891. 102(2):112-11u. Cantliffe, D. J. and S. C. Phatak. 1975. Plant popula- tion studies with pickling cucumbers grown for once- over harvest. JI Amen, See, Hunt, Sei. 100(5):464- 466. Cantliffe, D. J. 1977. Nitrogen fertilizer require- ments of pickling cucumbers grown for once-over harvest II. Effect on plant tissue mineral nutrient concentrations. JI Amen, See, HQII: Sei. 1-2(2): 115-1190 13 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 14 Comin, D. 1938. Early as affected by ferti See, Hort. Sej. 35: Comin, D. and J. Bushne cabbage, cucumbers, Sta. Bul. 420. Dearborn, R. B. 1936. composition in relat the cucumber plant. Men. 192. Downes, J. D. and R. E. yields of selected truck crops lizer treatments. Pnoo, Amen. 673-677. 11. 1928. Fertilizers for early and sweet corn. Ohio AgI: Exp. Nitrogen nutrition and chemical ion to growth and fruiting of Cennell Ungy, Agn. Exp, Sta. Lucas. 1966. Pickling cucumber yields in relation to NPK fertilization and P-K soil tests. PIQQ. 12th Int, H921. Congn, 1, Abstr. No. 456. El-Sheikh, A- M. g M. A. Abd El-Hakam and Albert Ulrich. 1970. Critical nitrate levels for squash, cucumber, and melon plants. Conn. in 89;] SQJ, ang PJQDt Anal. 1:63-74. El-Sheikh, A. M. and T. C. Broyer. 1970. Concentrations of total nitrogen in squash, cucumber and melon in relation to growth and to a Piper-Steenbjerg effect. Comm, in 89;] Sea, and Plant Anal. 1:213-219. Friedrich, G. and G. Sc hmidt. 1954. Untersuchungen uber die Nahrstoffausnahme van Triebhausgurken in Wasserkulturen. (The absorption of nutrients by glass-house cucumber in soilless culture). Arch. Gartenb. 2:319-335. Hoglund, C. R. 1958. (EQZIL_Ahfi1.). Economics of growing and irrigat— M‘ ing pickling cucumbers. B A E Sta. 40(4). 796-805. Lloyd, J. w. and J. P0 McCollum. 1940. Fertilizing onion sets, sweet corn, cabbage and cucumbers in a four year rotation. 219-236. 1]], Agz, Exp, Sta, Bul. 464: Johnson, W. A., C. E. Evans, E. L. Mayton, and W. A. Griffey. 1973. Soil Fertility studies with pickling cucumbers in the Piedmont Area of Alabama. Alabama Agz, Exp, Sta, Cin. Magrude, R. 1923. Observations on the effect of liming truck crops in Ohio. 29:175-179. 211. PIQQ- Amer, SQg, ngt, SQ;. 22. 23. 24. 25. 26. 27. 28. 29. 30. 31. 32. 33- 34. 15 McCall, W. W., R. E. Lucas, C. M. Hansen, and W. C. Hulburt. 1958. Fertilizer placement studies with the pickling cucumber. Mien, Agz, Exnt, Sta, Quar. Bnl- 40:637-645. McCollum, R. E. and C. H. Miller. 1971. Yield, nutrient uptake and nutrient removal b4 pickling cucumbers. 2 J, Amer. See, Hent, Sci. 96: -45. Miller, C. H. 1957. Studies on the nutrition and physiology of pickling cucumbers. Ph.D. Thesis, Mich. State Univ. 69 pages. Morrison, F. D. and S. K. Ries. 1967. Cultural require- ments for once-over mechanical harvest of cucumbers for pickling. J. Amen. Soo. Hort, Soi. 91:339-346. Motes, J. E. 1975. Pickling cucumbers production- harvesting. Mien, State Unit, Ext, Bul. E-837. Putnam, A. R. 1963. Horticultural aspects concerned with the production of pickling cucumbers for once- over harvest. M.S. Thesis, Mich. State Univ. 59 pageS- Reynolds, S. W. 1954. Studies with cucumbers for pick- ling. Ph.D. Thesis, Univ. of Maryland. Reynolds, C. W. and F. C. Stark. 1953. Growth and fruit- ing responses of cucumbers to varying levels of Ca, K, Mg and N in sand culture. Aesge, Southern Ag. Tankers. 50:133. Ries, S. K. 1957. The effect of spacing and supple- mental fertilizer applications on the ield of pick- ling cucumbers. Mion, Agn, Exp, Sta, Enact, Bul. 40(2):375-381. Ries, S. K. and R. L. Carolus. 1958. The effect of Xutrient level on growth of pickling cucumbers. Mien. E s B 0(3)2659-668. Seaton, H. L., R. Hutson and J. H. Muncie. 1939. The production of cucumbers for pickling purposes. Mien. gz, Exp, Sta, Spas, Bu]. 273. Tiedjens, V. A. 1926. Some observations on the response of greenhouse cucumber (Cucumis sativus) to certain environmental conditions. Pnoo, Amen, See, Rent, Sei. 23:184—189. Vaile, J. E. 1938. A . E S . 0t A R B . 368:82. 35- 36. 37- 38. 39- 40. 16 Vaile, J. E. 1942. Ark. Exp. Sta. 53rd Ann, Rut, Bul. 417:28. Ward, C. M. 1967. Greenhouse cucumber nutrition: a growth analysis study. Elant_ano_§oil 26:324—332. Ward, G. M. 1967. Growth and nutrient absorption in greenhouse tomato and cucumber. Pnoo, Amer, Soo. Hort, 891. 90:335-341. Ware, L. M., C. L. Isbell, H. Harris and W. A. Johnson. 1953. Studies with pickling cucumbers in Alabama. AJa. Agn. Exp. Sta, Cjn. 114. Wilkins, L. K. 1917. The high calcium content of some cucurbit vines. N J. Ex S . B . 310: 1.20. Wittwer, S. H. and J. Tyson. 1950. Yields of pickling cucumbers as influenced by rates of fertilizer appli- cation, fertilizer placement, and nitrogen side dressing. Mien, Agp. Exp. Sta. Bul. 32(4):535—539. SECTION I THE INFLUENCE OF NITROGEN AND PLANT POPULATIONS ON SEVERAL CULTIVARS OF PICKLING CUCUMBERS I. FRUIT YIELDS 17 fl . . . U)“. '1 10. q to ,- H ER pl; on: The Influence of Nitrogen and Plant Populations on Several Cultivars of Pickling Cucumbers I. Fruit Yields. Christopher J. Rajzer Denagtment of Horticulture, Mionigan State Uniyersity, East Lansing, MI 48824 Abstract: Early and late plantings of several cultivars of pickling cucumbers (Quoumis_satixus L.) were evaluated under various levels of preplant N and plant populations. Cultivars responded to treatments differently in fruit yields, sex express- ion, fruit set, and length to diameter ratios. Increasing the nitrogen rate to 67 kg/ha increased yields (metric tons and dollars/ha) in the early planting only, and 101 kg/ha appeared to suppress yields in both plantings. High nitrogen rates (67 and 101 kg N/ha) reduced the percent cull fruit in the first planting. Increasing the plant populations increased yields only when N was sufficient. Increasing populations from 99,000 to 296,000 plants/ha, increased the percent culls but decreased the percent oversize fruit. Both fresh and dry weight per vine decreased with increasing plant populations. Yield was positively correlated to percent pistillate flowers and fruit number per vine. INTRODUCTION Previous studies indicate that there are many factors influencing the yields of pickling cucumbers (Cuoumis sattyus L.) 18 Arc lg. C? ha: 0 6""- tr it HT 1 19 Some of these factors are cultivars, nutrients, or popula- tions which are somewhat controllable, or local environmental 'factors which are variable. Previous nutritional studies indicated that increased yields of cucumbers were obtained by broadcasting 448 kg/ha of 5-20-20 prior to planting (10). Nitrogen applied side- dressed or broadcasted as urea or ammonium nitrate at rates of 67 or 134 kg/ha produced maximum yields for a once-over harvest on a coarse sandy loam soil (2). Others (6) have indicated that various rates of N, P, and K, did not significantly increase yields, although, increasing trends were observed with an increase of N and K up to 90 and 71 kg/ha respectively. There are some indications (1, 15) that yields can be increased by addition of various individual elements, although yield increases were not consistent. Comparing vegetative growth responses, increasing incre— ments of N produced the greatest effects on growth and dry wt. (9). The maximum number of fruit was produced with a median level of N compared to a very low or high rate (2, 4, 9). Fruit per vine decreased with increasing plant populations (3). High N also improved fruit shape (11) in some studies, while others found the percent off-shape fruit and length to diameter ratios (L/D) to be increased (2, 7). Sex expression can be altered by increasing nitrogen levels, forming more pistillate flowers, although the ratio of pistillate to staminate flowers decreased (4. 7). Fruit set and numbers of marketable fruit were greatest under high nutrient conditions (12, 13). 0t from 50 5.01121 vs S from SC in tan a mul‘ CORIPT was t nitro relat in 1E Star ahd j 20 Other studies (3) with 2 cultivars and 8 populations from 50,000 to 850,000 plants/ha indicated that yields in dollars and tons/ha increased with increasing populations from 50,000 to 100,000 and from 250,000 to 500,000. A delay in harvest of 4 days doubled the tonnage but dollars/ha values did not change. By increasing plant populations, yields can be increased for once-over harvesting. Highest yields with the greatest number of fruits per vine were obtained from a 30 cm spacing with up to 215,000 plants/ha regardless of the distance between the rows (8). Most of the published data deals with cucumbers grown in a multiple-harvesting system and examines various levels of controllable factors on yield. The objective of this study was to examine the influence of cultivar, populations, and nitrogen, and how their main effects and interactions may be related to cucumber growth, sex expression, and yields. MATERIALS AND METHODS Cucumbers were planted in both early and late season tests in 1976. The May 25 planting consisted of 2 cultivars, Green Star and Premier, grown at 3 plant populations, 99,000, 148,000, and 198,000 plants/ha. The Conover sandy loam soil contained 11.5 kg/ha of residual NOB-N and 3.0% organic matter. The late planting on July 22 had 3 cultivars, Green Star, Premier, and MSU-76 with plant populations of 99,000, 198,000, and 296,000 plants/ha. The Conover sandy loam soil tested 37.3 kg/ha of 21 residual NOB—N and 2.0% organic matter. The soils for both plantings were medium to high in P, K, Ca, and Mg, with a pH of 5.9. The pollinators for cultivars were adjusted to 7 percent and planted with a Dahlman seeder in rows 40 cm apart, and the appropriate spacing within rows was obtained by thinning at emergence to acheive the desired populations. Seeds were planted in beds 5.5 m long and 2.0 m wide with 4 rows to a bed. Four levels of N (urea) 0, 34, 67, and 101 kg/ha were applied with a Gandy spreader and incorporated preplant along with 62 kg/ha of P and 116 kg/ha of K. The experiment was designed as a split-split plot with cultivars as main plots, N levels as subplots and populations as sub subplots, each replicated 3 times. Chloramben methyl ester at 2.0 kg/ha was applied immediately after seeding for weed control. Carbaryl at 2.0 kg/ha was applied twice in each planting for beetle control. Irrigation of 15 cm was applied during each season. A hive of bees was supplied to insure adequate pollination. At 35 to 40 days after seeding (DAS), 10 plants per plot were randomly selected and flower type characterized for the first 10 nodes. Forty—five to 50 DAS, fruit set on these nodes was determined by the swelling of the ovary. The early planting was harvested 53 and 55 DAS for Premier and Green Star respectively. The late planting was harvested 53, 54, and 57 DAS for Premier, MSU-76, and Green Star respectively. The cucumbers were harvested by hand simulating once-over mechanical harvesting. Fresh vine weight was recorded, and 22 fruit were graded and weighed. The grade and dollar values were calculated from standards established by the Pickling Cucumber Improvement Committee (PCIC), i.e. less than 2.0 cm diameter ($132/metric ton), 2.7 to 3.8 cm ($66/metric ton), 3.8 to 5.1 cm ($44/metric ton), and over 5.1 cm ($11/metric ton). The percentage of fruit culls, "nubs" and ”crooks" was calculated for each plot. L/D ratios were measured on 10 randomly selected fruit between 3.8 and 5.1 cm in length. The fruit dry weight was determined from fruit that were removed and dried at 70°C. RESULTS AND DISCUSSION William Cultivars responded in only the wt. per vine and L/D ratio for the early planting, with Green Star the more vig— orous cultivar (Table 1). Different cultivar responses were observed in the late planting with Green Star being the poor- est yielder in both weight and value/ha (Table 2). These lower yields corresponded to lower fruit numbers per vine. Green Star and MSU-76 had the highest number of pistillate flowers but the former cultivar had only 23 percent fruit set versus 39 Percent with MSU—76. Either poor pollination or the abortion of the ovary after pollination were 2 possibilities for yield differences between these cultivars in the later planting. In the first planting yields correlated closely with sex expression. As expected, cultivars respond differ- ently when grown under different environmental conditions. 23 The time of planting had a pronounced effect on the yields of pickling cucumbers. The early planting (May 25) responded differently to both N and populations than the late planting (July 22). These differences may have been related to local environmental factors or the differences in soil NOB-N. Differences were noted in vegetative growth between cultivars. In the early planting, the fresh wt. of Green Star was greater than that of Premier, while there was no significant difference in their dry wt. (Table 3). This indi- cates that Green Star makes more vigorous growth and may have a higher water requirement. For the late planting, vine wt. and L/D ratio did not differ among cultivars, but Premier and MSU-76 yielded sig- nificantly more than Green Star. The percent oversize fruit data does not support the idea of later maturity. Wilma: Nitrogen had its greatest influence on the early plant- ing. Yields increased as N levels increased up to 67 kg/ha after which there was no additional benefit (Table 1). The greatest percent culls were obtained with low rates of N, while less oversize fruit occurred with 0 and 101 kg N/ha. Increased fruit dry wt. was associated with higher rates of N. A signi— ficant interaction indicates that both cultivars were not different in fruit dry wt. at O and 34 kg N/ha, however, Premier was significantly higher at 67 and 101 kg N/ha. No 24 differences in sex expression were observed in the early planting that could account for a difference in yield (Table 3). C In the late planting, nitrogen affected sex expression but not yields. The lowest number of staminate flowers were produced with 101 kg N/ha. An interaction between cultivars and nitrogen levels for marketable fruit per vine shows Premier and MSU-76 both significantly better at O to 67 kg N/ha with only MSU-76 greater at 101 kg N/ha. Cultivars varied in sex expression, and with more pis- tillate flowers produced, the yields were increased. Nitrogen increased percent pistillate flowers and fruit set while staminate flowers decreased with increasing increments in the late planting. The lower plant populations did produce more pistillate flowers in the late planting only, but the differ- erces were so small they may be of no importance. Increasing rates of preplant N increased dollars and metric tons/ha in the early planting with no significant differences in the late planting. There are indications that at 101 kg N/ha fruit tonnage is depressed. McCollum and Miller (6) ob- served a positive yield response with increasing increments of N fertilizer up to 90 kg/ha, while Wittwer and Tyson (14) and Ries and Carolus (10) found no benefit of supplemental N, except on low fertility soils. In these tests, residual NOB-N for early and late plant- ings was 11.5 and 37.3 kg/ha, respectively. Cantliffe (2) observed that the percentages of off-shape fruit were greater 25 for higher rates of applied nitrogen, with no effect on L/D ratios. In the early study which was influenced by N, percent culls decreased with 67 and 101 kg N/ha compared to 0 and 34 kg N/ha, with no effect on L/D ratio in either planting. The differential responses to N between plantings could have been influenced by the daily mean temp. and amount of residual NOB—N in the soil or nitrification. With the higher temp. that occurred during growth of the early planting, the growth rate was rapid, requiring more N. With lower temp. and higher NO3_N level in the soil, differences were not noted. There were indications that increasing increments of N increased both vine fresh and dry wt. when yields were influ— enced by N. This confirms Reynolds and Stark's (9) work. However, when yields were not changed by N, there were no differences in vine wts. Po t' E e There were no influences of populations on yield or dollar value for the early planting (Table 1). However, per- cent culls was increased with an increase in population. Over- size fruit was reduced with 198,000 plants/ha. Green Star fruit size decreased linearly with an increase in population while in Premier size leveled off at 148,000 plants/ha. There was an inverse relationship between the fresh wt. per vine and population. An interaction indicated that Green Star was a vigorous cultivar producing more fresh wt. at all 26 populations. However, the dry wt. per vine did not differ with changes in populations. Both marketable and total fruit per vine decreased as populations increased. The greatest effect of population was in the late planting, with yield and dollar values showing similar trends. The highest yields were obtained with 198,000 and 296,000 plants/ha (Table 2). These yield differences attributed to population also correspond to the fruit produced per vine (Table 4). The total fruit per vine varied from 30 to 60% of the actual fruit set which was about one-third of the total pistillate flowers which indicate that yield is not necessarily related to this parameter. As plant population increased, in the late planting, the percent culls increased (Table 2) while oversize fruit de- creased. At 99,000 and 198.000 plants/ha Green Star had the greatest percent of oversize fruit, while MSU-76 had the low— est. There were no cultivar differences at the highest pop- ulation. Cantliffe and Phatak (3) reported that increasing the plant populations could increase yields. Yields in both dollars and metric tons/ha increased with increasing popula- tions for the late planting, with no effect observed in the early planting. However, in both plantings increasing the population increased the percent culls and decreased percent oversize fruit. Weights of fresh and dry vines decreased with increasing plant populations, while L/D ratios of fruit were not affected. Relationships between both fresh and dry wt. per vine and 27 dry wt. of fruit was noted (Table 2). As plant populations increased, the plant and fruit wt. decreased. Populations appeared to have the greatest influence on yields when nitrogen levels were not limiting. Although increasing the plant population increased the total yield, it decreased marketable and total fruit per vine. Cantliffe and Phatak (3) observed similar results. It also appears that there are differences in sex expression which can be attributed to planting dates and cultivars. N will enhance yield when not present in the soil in abundant supply, however, when the supply is adequate, plant population may then become the factor limiting yield. 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Literature Cited Bishop, R. F., E. W. Chipman and C. R. MacEachern. 1969. Effect of nitrogen, phosphorus and potassium on yields and nutrient levels in laminae and petioles of pickling cucumbers. C J. S S '. Vol.49, 297—304. Cantliffe, D. J. 1977. Nitrogen fertilizer requirements of pickling cucumbers grown for once-over harvest I. Effect on yield and fresh quality. J, Amer, Soo. Hort. Sci. 102 (2) 112- 114. Cantliffe, D. J. and S. C. Phatak. 1975. Plant population studies with pickling cucumbers grown for once— over harvest. J, Amer, Sec. Hort, SQi- 100(5): 464- 466. Dearborn, R. B. 1936. Nitrogen nutrition and chemical composition in relation to growth and fruiting of the cucumber plant. Cornell Unix. Agr. Exp. St . Mem. 192. Downes, J. D. and R. E. Lucas. 1966. Pickling cucumber yields in relation to NPK fertilization and P- K soil tests. roe. 12th Int, Hort. Congr. 1, Abstr. No. 456. McCollum, R. E. and C. H. Miller. 1971. Yield, nutrient uptake and nutrient removal %b44 pickling cucumbers. 2- J, Amer, See, Hort, 891. Miller, C. H. 1957. Studies on the nutrition and physi- ology of pickling cucumbers. Ph.D. Thesis, Mich. State Univ. 69 pages. Putnam, A. R. 1963. Horticultural aspects concerned with the production of pickling cucumber for once-over harvest. M.S. Thesis, Mich. State Univ. 59 pages. Reynolds, C. W. and F. C. Stark. 1953. Growth and fruit- ing responses of cucumbers to varying levels of Ca, K, Mg and N in sand culture. Assoo. Southern Ag. Workers 50:133 Ries, S. K. and R. L. Carolus. 1958. The effect of nutrient level on growth of fiickling cucumbers. Mien. Agr, Exp. Sta. Quart.Bu1. 0(3) 659— 668. Tiedjens, V. A. 1926. Some observations on the response of greenhouse cucumber (_uoumis_satixus) to certain environmental conditions. Pros. Amer. Soc. Hort, Sci. 23:184-189. 32 12. 13. 14. 33 Vaile, J. E. 1938. Ark. Exp. Sta. 50th Anna.BDta,Bu1. 368:82. Vaile, J. E. 1942. 417:28. Ark. Ex . St . d A R B . Wittwer, S. H. and J. Tyson. 1950. Yields of pickling cucumbers as influenced by rates of fertilizer appli— cation, fertilizer placement, and nitrogen side dressing. Mien. Agr. Exp. Sta. Bul. 32(4):535-539. SECTION II THE INFLUENCE OF NITROGEN AND PLANT POPULATIONS ON SEVERAL CULTIVARS OF PICKLING CUCUMBERS II. NUTRIENT CONTENT AND REMOVAL 34 The Influence of Nitrogen and Plant Populations on Several Cultivars of Pickling Cucumbers II. Nutrient Content and Removal Christopher J. Rajzer Department of Hortieulture, Mjehjgan State Unjyerejty, E L ° MI Abstract: Pickling cucumber (Quoumis_satirue_L.) plants and fruit were analyzed at harvest to determine the plant nutrient content and nutrient removal by fruit. Factors studied were time of planting, cultivars, N levels. and plant populations. The mean plant nutrient content of N, P, and K was 103, 9, 147 kg/ha, respectively, with mean nutrient removal of 22, 3, 38 kg/ha, respectively. The nutrient levels of three cultivars were increased by added N and increasing plant populations. Nitrogen treatments influenced plant nutrient content. Yields and percent cull fruit were also affected. As plant population increased, both total nutrient content in the plants and nutri- ent removal by fruit increased. Nutrient removal from a field by cucumber fruit is about 25 percent of the total plant's nutrient content at harvest. INTRODUCTION Nutrient concn of pickling cucumbers vary with applica- tion of fertilizer, spacing, and the physiological age of plants. Inverse relationships between soluble N and soluble P 35 36 with yield have been reported (10). The total N in the lamina and petioles does not correlate with yields, concn of NOB-N in the tissue rapidly decreasing during the period of fruit development (4). With multiple harvesting and moderate yields (9), total N, P, and K uptake was 101, 13, and 163 kg/ha, respectively. At low plant populations, N fertilizer was found to increase tissue concn of N, K, Ca and Mg (2). An inverse correlation exists between spacing and the concn of N03-N in cucumber petioles. P increased as spacing and N levels decreased. K levels were higher in plots re- ceiving low fertilizer levels, but at higher fertilizer rates K increased in petioles as spacing increased (13). The objective of this study was to evaluate nutrient concent and removal with various cultivars, nitrogen levels, popula- tions, and planting dates. MATERIALS AND METHODS This is the second part of a two—part paper. The pro— cedures utilized, experimental design, and fruit yields have been previously reported for these experiments (11). Plant tissues were collected at 3 periods throughout the growing season: First at tip—over (6-7 leaves), secondly between tip—over and harvest, and thirdly at harvest, with fruit and plants analyzed separately. Tissue was dried at 70°C, weighed and ground in a Wiley Mill to pass a 20~mesh screen. The tissue (.10g) was assayed for NO3—N using an Orion nitrate 37 electrode (5). Total N was determined by Macro-Kjeldahl 1. and procedure (1). K with the flame spectrophotometer other elements with the spark emission spectograph2 (6). Soil samples were taken at tip-over and analyzed for pH, BpH, P, K, Mg, and Ca by standard techniques. The nutrient content of whole plants and removal by fruit is reported in kg/ha or g/ha, and takes into consideration differences in dry wt. due to treatments and the content of nutrient in the plants/ha, rather than the concn. RESULTS AND DISCUSSION Both plantings were made on soils similar in nutrient levels (Table 1). Therefore, any difference in nutrient concn of the plant or fruit are assumed to result from the assigned treatments or local environmental factors. Gunner—Responses There were essentially no differences in the nutrient content of fruit (Table 2 and 3) or plants (Table 4 and 5) attributable to cultivars in the early and late plantings. No relationship existed between nutrient content and yields of these same cultivars. Cultivars tested appear to be efficient in their ability to use available nutrients in the soil (Table 4 and 5). However, differences were noted within a cultivar between different planting dates and various N and 1Beckman model B, Beckman Instruments, Inc., South Pasadena, Calif. 2Quantograph, Applied Research Laboratories, Glendale, Calif. 38 population treatments. This could be related to their adaptability to local environmental factors. Williams With increasing rates of N in the early planting, N, K, Ca, Mg, Mn, Zn, and NOB—N content of the plant increased (Table 4), and N, P, K, Ca, Mg, Mn, Fe, B, Zn, and NO3-N was significantly higher in Green Star at 101 kg/ha than Premier. While an interaction of nutrient removal of N, K, and B, in Premier were significantly higher at 67 kg/ha and 101 kg/ha than Green Star. There was a concurrent increase in the yields and a decrease in the percent culls with increasing increments of N, for the early planting (11). For the late planting, N had no effect on fruit yields (11) and no influence on the nutrient content of the plant and fruit other than NOB—N which increased with increasing increments of applied N in the plant tissue. It appears that in plant tissue, NO3-N does not correlate with yields. El- Sheikh and Broyer (8) found NOB-N values to be more satis- factory than total N to determine the critical N concn for maximum growth. Comparing both the early and late planting, the total N or NO3-N values (Table 2 and 3) can not be a satis- factory indicator of growth since there is no consistent re- lationship with yields, vine weights, culls, or sex expression (11). Cantliffe (3,4) observed that NOB-N was high in plants receiving high N, but also found it reduced yields. This supports the idea that NO3-N is not a good indicator of growth. 39 When N was limited (early planting), uptake of applied N increased linearly. When N levels were adequate (late planting) for growth, then the additional uptake of N was suppressed. Reynolds (12). growing cucumbers under varying rates of N, P, K, Ca, and Mg observed significant differences in the amounts of these elements in the leaves and fruit of all except N. Also, no yield responses were observed when N levels were adequate for growth. This indicates that N may influence the uptake of other elements and become a limiting factor of yields. The mean values of N, P, and K removed by plants for the early and late plantings were 98, 8, 150 and 108, 10, 144 kg/ha, respectively. Nutrient removal by fruit was 20, 2, 39 and 24. 3, 37 kg/ha, respectively. Higher nutrient content in the late planting compared to the early planting are associated with a higher percentage of pistillate flowers among both cultivars and N treatments. Dearborn (7) and Miller (10) reported similar findings. Tiedjens (14) found that high N improved fruit shape. Consid- ering percent culls as a characteristic of fruit shape. there was a decrease in culls with increased applications of N in the early planting. The shape of cull fruit indicated that pollination was not the cause but that nutritional content can become an influencing factor. W In plant tissue at harvest for both plantings all mineral elements were found to increase with increasing plant 40 populations (Tables 4 and 5) except for NOB—N in the early planting. The lack of change in N0 —N could have been the 3 result of rapid growth and metabolism. Ries (13), found an inverse correlation in NOB-N concn and plant population. This indicated that the plants were not receiving adequate N or that the metabolism of N03 was increasing with an increas— ing population. Fruit nutrient removal increased in both plantings with increasing populations, with Premier having significantly higher levels of P and Mg at 198000 plants/ha than Green Star. Nutrient removal had linear relationships between increasing yields (11) and populations in both plantings. When populations increase, the nutrients removed by plants and fruit may increase because of the increase in root to soil surface area. There- fore, higher plant populations require more of the available soil nutrients if higher yields are to be obtained. As pop- ulations increase, nutrient content of the fruit becomes about 25 percent of the total plant nutrient content at harvest. 41 Table 1. Soil analyses at tip-over. Planting pH Bph P K Ca Mg (kg7ha) Early 5.8 6.5 208.1 342.4 1554.5 301.6 Late 6.1 6.7 166.9 326.4 1390.0 213.9 42 .ao>ma Nm onu um ummu owamu oaawuasa m.amus:n hp muom Genus: doaumumamm amozs m2 m2 m2 m2 mz ez mz m2 m2 m2 m2 m2 m x N s a n2 mz ez m2 m2 mz m2 m2 mz m2 m2 ez m x N m2 m2 m2 m2 m2 mz mz s ez mz r mz m e a m2 m2 m2 s m2 m2 m2 m2 m2 e mz r N x a esoaoosaoosa Ase oone a8a has sea ea oaaa has ee.~ o.m can so.m emu ema som.o hes Asa sea sea Hes sea es.a se.~ sea no.~ aea eea Hone see sea as as ease aea Hea ao.~ won He.a Hea as use\eossaa any coo.a saw sea saa soa seoa sea s~.~ a~.m see sm.~ new aoa doe.o sea sou aaa sea smoa sea s~.~ ae.~ see sm.~ sea he aao.o seoa sea aaa aNa sacs ssea as.a a~.~ sea a~.~ aea em ase\mxv aeo.o ssh sea as as see ama se.a so.~ sum aa.N sea 0 "sowoauaz aav doe.o ewe sou sNa saa was sea so.~ em.~ ems me.~ saw seasons oo~.o sANa sea tea tea eaaa sea se.a s~.~ sea mo.~ seea seem scone "onseauaso Aav . ase\mv ass\sav zuooz as sN n so on a: m: we a m z hoooeeo has: .wsauamaa haamo How waaumm>uw£ ha vo>oamu uaaum Ga uaouaou usoauusz .N manna 43 .ao>oa Rm esp we who» amass mamapass m.sdossa hp mpmm canvas soapwadmom amaze .msoapodaousa psdoamaswam 02h em.m paaa pea pma ema eeoa rem pm.m pm.: or: he.m Lam emu ma.a ems sea eoa eaa eme ham em.m em.m hem em.m hem ema Ae.oooav sm.a see as se Le sae sea as.a se.m new am.a sea as "os\epssam so.m see sea as saa as» sow sa.m as.m aem sa.m dam aoa so.m smoa sea as sea ems saw se.m se.m arm ae.m saw he ad.a dos sea sea saa see smm am.m as.m gem so.m and am as.a sea sea sea sea see smm se.m sm.m gem sa.m amm o "somoaeaz em.m sea sea eaa sma ems sew ss.m sm.: ems sm.m sew esuamz so.m sme sea peoa saa ewe smm se.m oe.m dos sm.m cam seasons sm.a sad sma he he see sea sm.m se.m som sm.m seem seem noose "ess>aeaso Aes\ev Ass\mav atmoz as as m so om s: s: so a a z spooeeo sass z.wsapseam mama pom wsapmo>aon hp uo>oama pansy ca pampsoo psoaapsz .m Danae 44 .ao>ma am on» pm Home mwsdm vanavapz n.saossa hp upon manna: doapmadmom cease me we oz me me me me me me me m2 mg m x m n a oz mz mz we we mz me me me me me me m n m we oz oz oz me me me we we me me me m x a e we we me me me m2 me me oz me mg m a a mdoaposhopoa Asa Lm.ea oaemm seem pmaa omma emaam seem rem ems pmea em.o, Emma ema sm.ea smasm ream use osmoa uoaea moms new has eeea ma.e oooa era as.oooav se.oa amomm smea sae nee Leeaa acma sea awe eeoa ho.e ems mm os\hpssam amv oa.mm adamm seem sea seaa gamma. oeem sew see area .sm.e oema aoa ss.sa gamma snow awe sea smsea osemm sew ems saea as.» smoa se sa.e smeom Emma see aaoa aroma osmea smm see soaa _sa.m same am aos\wav ae.a sasem saea sme ssoa amaea smea sow see ssma sa.e see c soeohpas “we se.aa psemm seem ems see seaaa omea sow see sema pa.e ems seasons sm.sa seamm seam sooa oama semom seam sew oae saea os.e ssaoa nope dooeo aseapaso Lav Ass\mv Ass\mav znmoz as as m so or as e: do a m a ,opoosoo dads K .wsapsdam haaao Mom anabadn we advance pnuwhpsn vauam .s canoe AS .mam>ma Rm on» we who» amass mamavada m.swosso 59 mean canvas soapwammom swozu .mcoapodAOpsa pndoamaswam 02h m:.:m mHJHN pNHN pam Pmoa mzoma meN p:m pHOH pmma pm.md pmma mom mm.mm ANONH word mmr wmm MNONH mHNN mmm mmm mmzd mm.m mQOH mod Am.OOOHv ho.mm hmHmH hmmH hmm Amm ANHOH homa hma Mom MJOH Hm.w hom mm "d£\mvndam om.>m Emama Emma arm Ea» SOMNH Emmm 8mm 8m» Emma Em.m EOHH HOH cm.mm Emvma EHNH ENS 8mm ENQHH a0mm BEN Sam EGJH fim.m EOHH Pm c&m.mm Emmma Emma EH6 firm Bmoma HAHN fizm aOm Boga Em.m Bmoa :m Awn\muv BN.>H EHNmH Emhd Em» Ema EHNMH Show Sam Sam saga Sm.oa 8:0H 0 “ammonpfiz mm.dm momma dmom dmw wmh mmmaa swam arm mom dmmH 6:.HH meH mPIDmZ mm.mm wmmma mama whm wNm wmmm pHmH wmm dhm dmNH dN.m dam hmflfimhm dm.mm mmmmm wmva mm» wmoa damma meN dmm dmm wNmH um.m Named Adam sumac "mhm>apddo see sass Zlmoz H¢ :N m 50 0h G2 w: do M m z mPOOMho Gad: ) h.wsapcwam oped you pmo>adn pd psopsoo pumaApss psdam .m wands 10. 11. Literature Cited Anonymous. 1970. Methods of Analysis of the Association of Official Agricultural Chemists. Eleventh ed. Washington, D. C. Bishop, R. F., E. W. Chipman and C. R. MacEachern. 1969. Effect of nitrogen, phosphorus and potassium on yields and nutrient levels in laminae and petioles of pickling cucumbers. Can. J. Soil Sei. Vol. 49, 297-304. Cantliffe, D. J. 1977. Nitrogen fertilizer requirements of pickling cucumbers grown for once—over harvest I. Effect on yield and fresh quality. J. Amer. Soc. Hort Sci. 102(2):112-114. Cantliffe, D. J. 1977. Nitrogen fertilizer requirements of pickling cucumbers grown for once—over harvest II. Effect on plant tissue mineral nutrient concentrations J. Amer. Soc. Hort. Sci. 1-2(2)=115-119. Cantliffe, D. J., G. E. MacDonald, and N. H. Peck. 1970. The potentiometric determination of nitrate and chloride in plant tissue. New York's Food and Life Sci. Bul. No. 3. Carpenter, P. N. 1964. Spectograph analysis of plant tissues. Main Agr. Exp, Sta. Miss. Publ. 666. Dearborn, R. B. 1936. Nitrogen nutrition and chemical composition in relation to growth and fruiting of the cucumber plant. Cornell Unix, Agr. Exp. Sta, Hem. 192. El-Sheikh, A. M., M. A. Abd El-Hakam and Albert Ulrich. 1970. Critical nitrate levels for squash, cucumber, and melon plants. Comm. in Soil Soi. and Plant Anal. 1:63—74. McCollum, R. E. and C. H. Miller. 1971. Yield, nutrient uptake and nutrient removal b pickling cucumbers. J. Amer. Soc. Hort. Sci. 96: 2-45. Miller, C. H. 1957. Studies on the nutrition and physi— ology of pickling cucumbers. Ph.D. Thesis, Mich. State Univ. 69 pages. Rajzer, C. J. 1977. The influence of nitrogen and plant population on several cultivars of pickling cucumbers I. Fruit yields. (Proposed ASHS) 46 12. Reynolds, 0. W. 1954. Studies with cucumbers for pickling. Ph.D. Thesis, Univ. of Maryland. 13. Ries, S. K. 1957. The effect of spacing and supple- mental fertilizer applications of the yields of pickling cucumbers. M A E S . pol. 40(2): 375- -381. 14. Tiedjens, V. A. 1926. Some observations on the response of greenhouse cucumber (_uoumis_satirus) to certain environmental conditions. Proo, Amer. See, HQII. Sol. 23:184'189- 47 APPENDICES 48 49 .am>ma Nm Dru um umou owamu maaauasa m.cmoaaa mp moon canuwa GOHumumamm cmmzN oa.oa oo.a sa.a sa.a se.m so.a ho.a ee.o am.o esa Le.0a es.o ee.a na.a La.a so.a has.o na.o wa.o eea ae.OOOaV se.m oe.o ae.a sm.a ne.m as.o se.o He.o a~.o as “se\hossaa sa.0a se.o se.o sm.a sa.e os~.a ca.a ae.o sm.o aoa se.aa se.o se.a ee.a sm.e sm.a ca.a aa.o sm.o he em.oa sm.a sa.N sa.a se.m ose.o cae.o ae.o am.o em Ase\wgo aa.e ea.a sea.a aa.o s~.~ Ee.o ae.o ae.o am.o o “doeonoaz se.a ee.o se.a ea.a se.m ss.o se.o se.o s~.o seasons ee.0a se.o se.a sm.a ee.m ea.a sa.o ee.o sme.o seem sooao sens>aeaso asses m so e e e e a aa .4 m seemso a «a ma a moooeeo sass .oasse eo Ase\ezv areas: “mcaucmaa maumm .HI< manme 50 .aw>oa Nm ecu um umou owns» oaaauass m.cmocsa an moon casuas coaumumaom amass se.oea ea.eea ss.eoa s~.me Hads He.ma ae.e eaa Le.aa~ HToea no.aaa na.ee ea.oe H0.: He.~a eea Ae.oooao Lm.saa se.eea L~.eoa H6.8 o~.oe asea no.4 as use\eoseas am.eea a~.oea sa.6aa ca.se osa.oe sae.ea so.~a aoa ae.eo~ sN.aea s~.~aa ce.ee oo.~e se.sa ae.e me se.aea so.eea so.eoa sao.me so.oe aa.ea as.s em Aee\eav so.mea aa.mea se.aoa se.se as.sa se.ea so.e o “somehoaz ee.maa sa.mea se.e6a se.oe ee.am se.ea so.e seasosm sm.eaa se.mea ea.aaa ea.se se.~e ea.ea NsN.Oa seem sooso "oes>aoaso e.e ea ea em «a ma ea memuo muomumo cam: .vaus uasum "wcausmHa haumm .NI< manme 51 um.om .ao>wa Nm one as umou owsmu manauasa m.dmucnn up move casuas coaumumnom seats maa. wm.am am.qm wea mma. u~.em mm.wa um.mm wea Am.oooav pea. ua.mm ue.ea ue.~m mm "mn\muawam awo. aa.~m an.om s¢.¢m aoa coo. sm.mm a¢.oN a~.¢m no sea. amen saga Sega ea 3&9: sea. 8. am as . ea 3. as o usoeosoaz mma. me.em na.ma am.ew umafimum mqa. mu.om mo.- Nm¢.mm umum cameo "mum>auasu mca>\ua=um newscan mo Amn\azv AEUV muomwwm can: maaao oasum unmoumm .u3 msa> Locum camcoa osa> .umo>amn um wumuoamuma ocean nonuo “wsausMaa xaamm .ml< manna 52 .am>ma Nm may on umou mwamu uaaauasa m.smus=o he have casuaa soaumumamm amass uae. aaa. 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Es.~ En.s now. om.m aoa se.e seem Eae sew Eon Ewen cuss cans. Ee.~ Ea.e Eon. so.m ae Ee.~ Eaaoa see 5am sum Esme same mama. Ee.~ sao.e Eeu. Em.~ em Awn\sxv Ee.o Eeeoa see ass ass Ease Eee Ese. 3s Ee.a Ems. ass o “sosonoaz s~.s seem Ema sea son maem see was. on.~ ma.m Emu. sm.~ noasunm sm.m seeoa sae saw sen meme sea mas. mn.~ sa.e sun. asa.~ nsom Eoono “sns>auaso asses any Guam 0 fl zumoz as on s so on E: s: so u a z on as: u.waanamam aanmo nom .ma I ma saga so made mosa> ca sasmamam unmannaz .HHI< manna 60 .ao>oa Nm men as nmoo Tween manauaaa m.amo==n an muom cannaa coaumnmmmm cmuz& .umo>nmmu ne.o neaa nas nea nea seaa nas nea. nos. sa.e naa. se.~ saa ne.o naoa nma nea nea ssaa nan nea. nea. sn~.e naN. sne.~ sea as.oooao ne.o naea nea nea nea naea naa nsa. nea. ns.e nos. na.~ aa “se\snssaa oo.a Eaaa Ema sea Eaa Eoea Ens sea. sss. a~.e Ens. oa.s aoa se.o Essa Ems sea Eaa aaaa Ems sea. Eaa. a~.e Ens. sn.~ he E~.o Eeea sen Ema Eaa Essa Ens Ema. sss. s~.e cos. Es.~ ea ase\sso Ea.o Eena sen Ema Eea Esoa .Ean sea. ass. En.e sea. Ea.~ o "sosonnaz se.o eae sea sea sea sss saw sea. sss. s~.e sos. se.~ noaaons ss.o sasa sss sea sea seea saa sea. sss. s~.e sss. ase.~ nsns soono ”snssanaso Aaaav ANV muommmm can: znsoz as Es s so on s: s: so a n z u.waaucmaa manmo now .ma I ma mash so nannm ea mommamsm unwanuaz .Nal< manna 61 ao>oa Nm on» us ammo mwamn maaauaaa m.smoaso up some Easnas soaumnwaom smash . ummzmmn no.e naoaa nea nae nee sson naa nsn. ns.n sa.s nae. sa.e saa nn.e neeoa nna nae nse ssee nna nan. ns.~ ne.a nae. sne.a sea as.oooao ne.e nessa nea nae nae nsas noa nsa. na.~ ns.a nae. no.e aa use\snssaa oe.oa Eeeoa Eeoa soe see sans seoa oas. Ea.a se.a see. oe.e aoa so.n Eseoa Eaa sae sae Eaae sooa cons. so.a Ea.a see. sn.n ne Ee.~ Eaeaa Eas Eae Eae seen Ees sass. Ea.a aa.a see. ss.e es ase\sao Ee.o Easaa sss Ese ass sosn sen Ese. En.~ aa.s Eae. Ee.e o “sosonnaz sn.e sasoa sea sas see seee ses sen. ss.a s~.a see. se.e noaaonn sn.e sessa soa see sss ssan sna sas. sa.~ ss.a sae. ase.a nsns soono "snssaoaso asaao ans snooneo sass zumoz as on s so on s: s: so s a z N.maau:maa sanmo now .ma I ma mash so uaanw was mosa> mo momhaanm nsoanuaz .sa.< sassy 62 .am>oa Nm man as noon owsmn oaaauaaa m.swossn as some cannab aoaomnmnom duos» nu>OInaHu na.a naaa nos nna nea naae nos oa.e naa nan ne.~ nos saa se.n seos sss saa soa saae sas so.e oaa sea sa.a sss sea as.oooao nn.e name nea ns nNa ness nea ne.n ns nea n~.a nea aa “se\snssaa so.oa sans Eoe Ema Eaa aase use 5a s Esa Ens as a sea aoa Ee.a seas sas Ema ssa sose nae s~.e sea ans as.a sen no as.e sens ass Ema ssa sane sss as e sea Ens so a ass es ass\sao Ee.s soon sss aaa asa Eaae ass .Ee a .Eaa sen Ee a soa o nsosonnaz sa.e saea sea saa sea some sss se.s saa sss se.a saw noaaons se.s saes saa sea saN seae sue os.e sea sos sa.a asea nsns soono nonseanaso s s Ase\ V .n ase\ so snooeeo sass zusoz as EN s so on as s: so a a z n.msanssan zanwo now .a hash so unansou unmannaz .eat< manna 63 .ao>wa Nm can on umou mwswn mamauaaa mnsmussa me some cannaz soaumnmamm amass sea seeoa coma one saa saaaa naea nea nee naa .ns.e noa saa sea seaon saaa sae sae sseoa ssaa saa saa sss se.e sss sea as.oooao noa neaaa nee nea nea neoe nee nn nus nae ns.~ nea aa "snesnssaa can seona onsa soe aae saaoa oaea Ema soe Ens Ea.s eon aoa sna asnoa ossoa soe see aeeoa osna saa sss Eaa s~.e osae ne an saosa ssea sss see sans ssa Ema sea sen Ea.e saa es ase\sso Ea aanaa Ean Ens Ens. seen son Es sea ase Ea.s sea o "Eosonnaz sna sasea sna ans soa sees sea soa saa sse sa.s sae noasons sea seoaa snoa sse sae saaa sasa saa sas ses se.e ssoe nsna soono nonssanaso 3:3 3:9: zrsoz as En s so on s: s: so a n z enoonno sass N.wsanaman aanmo now .m hash do unansou unmannsz .mal< maan .ao>oa as one on ammo owsmn waaauasa m.smuaan an moon nannas coanmnmamm smash 64 nmo>nmmu nea manna seen nsa saaa soooa sees nsn noa mama sna saa nsa nssen saaa sss snaa nssea seoa saw san ssaa sss sea as.oooao noa neana nasa nae nan nsoea neaa nea nos nsn nae aa "se\snssaa can snssa aoea aes seoa saesa oeea sen ass soea saaa aoa Ena semen ansa son sos aaeea osaon sss son aeoa aan ne Ee Esnaa aosa sen sas amana sssna son see aeoa one es ase\sao an amass Eeea sen ssa Enema aeea Esa Ese sea ans o "sosonnaz eaa amass sesa nae sen senaa seea ssa sae sea sss noaaonn ssa sssos swan soa snaa snaaa sass sea san ssna ases noes soono "snssanaso ase\so ass\sso II mooommm samz zuaoz a... on s so on as s: so on 2 N.waaucmaa zanwo now .ma I ma hash so made mosa> Ea usousoo unmanusz .oat< manmh 65 .ao>oa Nm onu um omen mwamn maaauasa w.smusao as some cannaa coaomnmaom chZN so.aa ns.o na.o na.o ma.e n~.s ne.~ sa.a na.o eaN ss.aa se.o sa.o se.o ns.e sa.~ so.~ sa.o na.o saa as.oooao ns.aa na.o ns.o na.o sna.e n~.~ ne.a ne.o na.o aa "se\snssaa Ea.aa se.o sa.o se.o Eo.e Ea.~ Ea.a Es.o sa.o aoa so.aa Ee.o se.o Ee.o E~.e Eo.s E~.~ Ea.o sa.o ne Ea.aa Ee.o se.o se.o Ea.e Ee.~ Es.a Eo.a sa.o ea ass\sao Ee.aa se.o se.o Es.o Ea.e Es.~ Ea.a Es.o Ea.o o “sosonnaz sn.ea se.o sa.o se.o ss.e ea.a ee.a sa.o sa.o enuosz se.aa se.o se.o se.o so.e es.~ sa.a sa.o sa.o noasonn sa.oa se.o se.o sa.o sa.e sn.a sn.a ss.o soa.o nsns ssono ”snssanaso asnon saaso s.e sa em as ea sa «a movanu muummmm can: .nasne no ase\azv snesaoz "scanssaa onsa .aaIe oaesn 66 .am>oa Nm can an ammo omcmn maaanase m.smossn an mums cannas coaumnmamm amass sa.ae se.ss s~.na no.ee ne.as na.ea ns.e eaa na.asa ne.asa nn.aoa ns.se ne.ss ne.ea ne.e saa as.oooao na.eea ns.oea ne.eoa na.ae ne.as n~.aa ne.e aa "ss\snssan Es.aoa Es.eoa Es.ooa Ee.~e Ea.aa Ea.na sa.o aoa Ee.eaa Ea.oea Es.aoa Ea.se Ee.sa Ee.ea Es.e ne Ea.eaa Ee.eaa ETooa ao.ee Ee.am Es.na Ee.e es ase\ssv Ee.eoa Es.asa Ee.soa Ee.ee Ee.as E~.ea Ea.e o "sosonnaz sa.eaa sm.saa sa.ooa sa.ae se.as ss.sa ss.e enussz se.naa ss.eaa s~.aoa se.ae ss.aa se.ea se.e noaaona se.eoa se.naa ss.aoa se.ae ss.ss ss.ea sss.e nsna soono "snssanaso s e as ea sa es sa «a L. momnu muoomwm can: .aso n3 nasnn uwcausmam mama .mal< waan 67 .ao>ma Nm man on ummu owamn oaaanasa m.smossn up some cannas soaumnmamm amass nmo. um.m~ ne.om nm.no emu nno. mm.am mo.- na.aoa wma Am.oooav nmo. na.em ne.~m nm.ooa mm am£\mnsmam amo. ae.am a~.mm sm.mm aoa amo. am.am Em.mm am.mm he s8. seas saga Ee.aa ea assess Eno. so.~s Es.na Ee.aoa o "sosonnaz moo. ma.em mm.nm mo.mm enlamz mwo. mm.mm an.e~ we.mm noaaonm mmo. mo.m~ mm.¢~ nma.~oa nmum somno amnm>auazu wca>\ua3nm mmmBOan mo Am:\mzv Aaov wuuommo saw: maasu nannm ocoonmm .oB msa> noonm nuwsma mca> in .umo>nm: um mnmumamnma ocean nmcno ”wdaucmae mama .maI< maan 68 .ao>oa Nm ecu um nmou owamn mamanaaa m.:mos=n kn muom sagas: soanmnmaom amass mwm. nmm. noo.a nmm. nmm. nmm. nma. mmm. wmm. new. owe. emm mam. nmm. noo.a nmm. nmm. noo.a nmm. anon. mnmm. nea. wee. mma Am.OOOav nam. nmm. noa. noo.a noo.a noa. now. now. nam. nea. new. mm "mn\muamam aoa. Baa. aoo.a 8mm. 8mm. aoo.a 8mm. cum. sum. Bum. awe. aoa 6mm. aoo.a Boo.a Baa. Baa. Boo.a Bea. sacs. amm. Ema. fine. no 8mm. Baa. Baa. Ema. Boo.a 8mm. Bea. naea. nmm. aoa. Bee. em Am:\mxv 3mm. 8mm. aoo.a Boo.a soo.a aco.a 8mm. Ems. Emu. anm. Ban. 9 “ammonuaz «N6. mam. moo.a moo.a mom. moo.a «mm. mom. ma¢. mom. awn. chasm: nmm. Mom. mom. mam. mam. mom. new. nan. emu. mm¢. new. noaamnm mom. moo. asoota mom. soo.a moo.a mmm. «mm. «mm. nea. amen. nmum scone «mnm>auasu new: 0a m m m e m e m N a mnommmm samz coaumooa mwoz .meoc noa mnmaoam mumaaanmam nwsansmam onma .oml< macaw 69 .ao>oa Nm mco um ammo owcmn maaanasa m.amoaaa an muom sannaa coaumnmaom cmmzn seo. nao. noe. nao. nao. nao. nno. sea. sea. nao. nao. eaa seo. nao. nao. nao. nao. noo. nno. snas. snea. nao. nao. saa as.oooao neo. nao. nao. nao. nao. nao. neo. noa. naa. nNo. noo. aa "se\nssaa ceo. an. Eoo. an. an. Eoo. an. ssa. Ema. Eso. Eoo. aoa case. Eoo. Eoo. an. an. an. Eeo. EEeN. Ema. an. Eoo. ne ‘ Essa. aao. saa. sao. an. an. 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Eoo. moo. aoo. aoo. aoo. apo. apo. aNo. eon. mm Amo\mxo amo. aoo. aoo. soo. aoo. aoo. soo. apo. moo. aNo. apm. o ”mmmOpppz mmo. moo. moo. moo. moo. moo. moo. moo. moo. moo. ppm. opuomz omo. moo. moo. moo. moo. moo. moo. mpo. mpo. mNo. mom. pmpampp moo. moo. moo. moo. moo. moo. moo. mpo. mpo. m~o. mmmp. pmpm mmmpo "mpmppppmo mwmpm>< op o o p o m m m N p mpmmppm ppm: aowumuoa mvoz .mvoc uma mumsoam wcfiam "wafluamaa mama .NNI< manna 71 .Hw>wa Nm nu um ummu mmawu maawuasa w.:modan hp mumm cwnuw3 nowumummmm cmmzu pp.~p~ pm.pomp po.mmm mo.mpp po.o po.o mom pm.pp~ po.oomp pm.o~o po.mop pp.o po.o mop Am.ooopo pp.~p~ pm.~pmp pp.opm pN.pmp pp.o po.o oo "mm\mpmmpo a~.o~N ao.momp am.mmm am.mmp se.o mo.n pop ap.mNN ao.momp ao.mmm am.oop ap.o mao.o po mo.mop am.mm~p mo.mmm ao.oop ao.m mao.o mm Amm\mpv am.op~ a~.momp ap.mom am.mop ap.o sa.o o “ammopppz mo.op~ mm.~mmp mm.mmm mo.oop mo.o mo.o opuomz mo.~p~ mm.~pmp mm.~om mo.oop mo.o mo.o pmpampp mo.op~ mp.mpmp mm.mmm mm.mmp mp.o mmo.o pmpm mmmpo “mpm>pppmo Amm\mxo ma mo M o mom mo mpmmpmm ppm: .mmmmamam Hwom "wafludea mama .mml< maan 72 .Hm>ma Nm wSu um umwu mwamu maawuaaa m.amo::o kn mumm aflzufi3 coaumummmm ammZx ppmpm mmcw> ufiaum madm.mmaw> .umm>ummm .um>onaHH~ pp.o po.op po.o po.m ooN mp.m mo.Np mo.op mp.m mop Am.ooopo po.m pp.op pp.mp po.m oo "mm\mpmmpp p.m am.MH sa.op mo.m pop ap.m am.mp am.pp sa.o no o.m so.mp so.op mo.m mm Amm\wxo p.m am.mp ao.pp ao.m o “ammopppz mm.m mp.mp mm.pp m~.m op-omz mp.m mm.pp mo.op mo.m pmpampm ma . m mm . ma wq . OH gnaw. o» kum numb—0 "muwkfimuafio pup-Mp .pomm oppump .pomm p .pomm .mmm pmmmmm mpmmppm mpmz .wcfiuamHa muma you Amy munmfima mun .¢NL< manna 73 .Hm>ma Nm mnu um ummu mwamu mamfiuasa m.amoaan hp mumm casuaa coaumuwamm smut» um>0IQHHN pp.o mpom pom mm.op pop mmom pap poo. mo.~ p~.m mom. p~.m mom po.o mpon ppm mo.op pop moon pop ppm. po.~ p~.o mom. mo.m mop Am.ooopv p~.o poop pun pm.o~ pop pone pr poo. po.~ pm.m ppm. po.m oo “mm\mpmmpo m~.o amoo awn sa.om amp ammo oNo aoo. ao.~ sa.o amm. ao.m Hop a~.o ammo ado ap.op amp soda pop aoa. ao.~ a~.m emu. sa.o no mao.o ammo eon ap.op amp anon ape amo. ap.~ am.m amm. ao.m mm Amn\wxv ao.p amok ape am.op aoa ammo aoo amo. so.~ a~.m amp. ao.m o “mmwopppz mo.o moon mum mm.op mop moon mph moo. mo.~ mp.m mnn. mo.m opuamz mm.o mpop mom mm.op mop mono mop mNo. m~.~ mp.m mom. mo.m pmpampm mo.o mpmo mom mm.o~ mop mopm map moo. mp.~ mn.m mmN. pmo.m pmpm mmmpo ”mpm>pppmo moo A v ANV mpumwpm apmz zumoz Hm cN o no mm m: m: mu m m 2 L In: u.wafiunman mama pom .¢N unama< so mummamam unmwuusz .m~L< magma 74 .Hm>ma Nm may um umwu mwamu manouaaa m.dwod:a on mama casuaa aoauwuwmwm dawns .waauamaa muda Mom .H umnfimunmm no mmmhamdw ucmauuaz po.op mooo poo mo.- pop mooo poo poo. po.~ po.o moo. po.o ooo po.o mooo ppo mpo.- pop mooo moo poo. po.o p~.o mom. mo.o oop Ao.ooopo pN.pp pooo poo po.- pop pooo poo poo. pH.o p~.o poo. p~.o oo "mo\mpamao oo.op amoo maoo ao.- amp ammo coo aoo. sa.o ao.o ago. a~.o Hop omo.op aooo mpo ap.- aoa aooo oaoo moo. _ap.o so.o goo. ao.o oo mm.op aooo moo a~.- aoa aooo memo aoo. ao.~ se.o eon. aa.o on Amn\wuo mo.o soop aoo a~.o~ amp aooo aoo moo. ao.~ ao.o goo. ap.o o ummoopppz mo.o mooo moo mo.o~ mop mono moo moo. mo.o mo.o mom. mp.o oonomz mo.pp mmop moo mo.p~ mop moan moo moo. ma.o m~.o moo. mo.o papampo mo.op moon moo m~.o~ mop moon moo moo. mo.~ mo.o moo. mmo.o pmpo compo umpm>pppao Aaaav ANV muommmo dam: znooz Hm mu m so mm a: o: mu m o 2 lg .oNI4 manna 75 .Hm>mH Nm mzu um umwu «mama mamauasa m.cmuc=n hp mumm 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mo.o moo pmoampo moo moooo mooo moo moo mooo mooo moo moo moo mo.o mmoo pmuo mmmpu “mpm>ooomo omoooo omo\oxv muummmm com: zuooz o< mo o no mo :2 oz mo M o z o.maouawoa muma Mom .o umnamunom do uauuaou unmouuaz .Hml< mHan 80 .om>oo Nm ago on ummu mwcmu monouoaa m.:moa:n on mumm nonuos aooumumaum sums» .ummbummu umm momom uwma umm mmm momma uwcm uHm uom uemo un.w umoa 0mm mom uoHoH woma mmo moan HMHHH ammo mom awn m©OH mw.o mow wma Am.oooav now Moqqa Homo “no How Mama “nea “no hum Hm» na.o Hoe mm own\muamam moo aoooo mooo aoo aoo aoooo aooo aoo moo mooo so o aoo ooo mmoo aoooo mooo aoo aoo aoooo aooo aoo aoo aooo so o aoo oo maoo aoooo mooo aoo moo aoooo aooo aoo moo aooo mo.o 8oo oo omo\ooo aoo aoooo aooo aoo aoo aoooo aooo aoo aoo aooo so o aoo o "mmoopuoz mam ammma mama «no wan MNOHH wNNN «mm «mm mmaa mo w «mm oslamz mom mm¢~H mowo mwo moo mon Dana now «no mum an.m mow umoauum mow mmeN mooo mum mmm mooqo waom mom mum NNNH NH m zmmm kum nacho “mum>ouaao omo\oo omo\oMo zuooz o< go o no mm a: o: mo M o z muummmw com: Nomcoucmom mumo pom .oo I no anamunwm do aono moao> no uaousou unmouuaz .NMI< mommy 81 Table A-33. Daily extreme and mean temperature data recorded from the Horticulture Research Station, East Lansing, MI. Date Max. Min. Mean Date Max. Min. Mean May 15 73 59 66 23 79 57 68 16 66 60 63 24 80 6O 7O 17 69 54 62 25 73 65 69 18 57 50 49 26 76 6O 68 19 60 35 48 27 85 62 74 20 64 46 55 28 85 66 76 21 76 49 62 29 82 62 72 22 69 39 54 30 78 56 67 23 63 41 52 24 60 38 49 July 1 65 55 60 25 62 43 53 2 75 53 64 26 64 43 54 3 76 52 64 27 68 42 55 4 73 54 64 28 74 52 63 5 84 55 70 29 72 59 66 6 85 60 73 30 65 57 61 7 86 61 74 31 74 59 67 8 85 60 73 9 79 55 67 June 1 74 58 66 10 81 68 75 2 70 47 59 11 89 78 84 3 73 45 59 12 89 56 73 4 76 53 65 13 76 48 62 5 80 50 65 14 78 58 68 6 81 52 67 15 94 64 79 7 83 56 7O 16 90 65 78 8 85 55 70 17 75 52 64 9 86 59 73 18 85 58 72 10 89 63 76 19 83 57 70 ll 88 68 78 20 85 66 76 12 88 56 72 21 84 64 74 13 84 65 75 22 80 58 69 14 89 67 78 23 83 63 73 15 90 73 82 24 84 64 74 16 80 61 71 25 80 57 69 17 73 52 63 26 84 61 73 18 78 55 67 27 87 67 77 19 85 62 74 28 86 57 72 20 72 48 6O 29 80 65 73 21 78 56 67 30 71 57 64 22 73 62 68 31 76 63 70 82 Table A933. Daily extreme and mean temperature data recorded from the Horticulture Research Station, East Lansing, MI Date Max. Min. Mean Date Max. Min. Mean August 1 71 50 61 10 72 48 60 2 73 48 61 11 67 52 60 3 70 44 57 12 80 55 68 4 80 49 65 13 83 52 68 5 78 62 70 14 84 58 71 6 80 59 69 15 87 57 72 7 72 50 61 16 59 58 59 8 72 48 60 17 68 59 64 9 77 48 63 18 74 52 63 10 81 52 67 19 76 49 63 11 85 65 75 20 79 58 69 12 84 7O 77 13 86 68 77 14 82 62 72 15 68 50 59 16 72 44 58 17 73 46 60 18 80 48 64 19 85 50 68 20 88 57 73 21 88 58 73 22 87 57 72 23 90 56 73 24 82 56 69 25 85 57 71 26 84 61 73 27 85 63 74 28 86 65 76 29 80 49 65 30 70 38 54 31 69 51 60 Sept. 1 86 60 73 2 68 4O 54 3 72 50 61 4 83 62 73 5 79 47 63 6 67 39 53 7 78 52 65 8 88 61 75 9 92 61 77 ”'CIITI'ITIQI’IILTIMIMJflifjlilflfigfilflimfljfgllfilfl'Es