Interference and control of two varieties of jimsonweed [Datura stramonium L. var. Stramonium and var. Tatula (L.) torr.] in soybean [Glycine max (L.) merr.] with oxyfluorgen [2-chloro-1-(3-ethoxy-4-nitrophenoxy)-4-(trifluoromethyl) benzene] and RH 881...