Use of Preemergence and Postemergence Herbicide in Soybean

Abstract

Field experiment was carried out from July through October 1995 to study the effect of preemergence and postemergence herbicide on weed control and soybean yield. The preemergence and postemergence herbicides were treated at 1 and 21 days after sowing respectively. All herbicide treatments were applied with knapsack sprayer using water carrier volume of 500 l/ha. Preemergence herbicide; alachlor (2-chloro 2,6-diethyl-N-(methyloxymethyl acetamide), metolachlor(2-chloro-N-(2-ehthyl-6-methylphenyl)-N-(2-methoxy-1-methylethyl)acetamide), oxyfluorfen (2-chloro-1-(3-ethyoxy-4-nitrophenoxy)-4-(trifluoromethyl bezene) and oxadiazon (3-(2,4-dichloro-5-(1methylethoxy)phenyl)-5-(1,1-dimethyl)-1,3,4-oxadiazol-2-(3H)-one) and postemergence herbicide; haloxyfop-methyl (2-(4-(3-chloro-5-(trifluoromethyl)-2-pyridinyl)-oxy) phenoxy propanic acid), fluazifop-butyl(+-2-(4((5(trifluoromethyl)-2-pyridinyl)oxy)phenoxy)-propanoic acid), quizalofop-p-tefuryl (R)-2-(4-(6-chloroquinoxalin-2-yloxy) propionic acid) and propaquizafop (2-isopropylideneamino-oxyethyl (R)-2-(4-6-chloro-quinoxalin-2-yloxy)phenoxy) propionate) mixed with fomesafen (5-(2-chloro-4-(trichloromethyl)phenoxy)-N-methysuthylphenoxy)-2-nitrobenzamide) showed excellent control of grass and broadleaf-weeds. The use of preemergence or postemergence herbicide for weed control in soybean increased yield significantly compared with control (non-treated).