Efficacy of Haloxyfop-R-methyl ester in Soybean Grown after Rice

Abstract

Two experiments were undertaken in Chiang Mai and Lampang Province during 1991-1992. Haloxyfop-R-methyl ester (2-(4-(3-chloro-5-(trifluoromethyl)-2-pyridinyl)-oxy)phenoxy propanic acid) were treated as early-postemergence (28 days after soybean sowing) at the rate of 40, 80 and 160 g (ae)/ha with knapsack sprayer in the spray volume of 500 l/ha. The results showed that haloxyfop-R-methyl ester at the rate 80-160 g(ae)/ha gave very good control of annual grass weeds; Digitaria adscendens, Eleusine indica, Setaria geniculata, Dactyloctenium aegyptium, Leptochloa chinenssis, Echinochloa crus-galli and Cynodon dactylon. The use of surfactant (Sandovit) in tank mix gave non significant on the efficacy of haloxyfop-R-methyl ester application. The use of haloxyfop-R-methyl ester for the annual grass weed control could increase yield of soybean up to 14% compared with control.