Ecology, Environment and Conservation Paper

EFFECT OF CHEMICAL WEED CONTROL MEASURES ON YIELD OF SOYBEAN

H D. Baviskar, B.T. Shete and H.M. Patil

Abstract

An experiment was conducted to evaluate the effect of chemical weed control measures on yield of soybean at Post Graduate Institute Farm, M.P.K.V., Rahuri during Kharif 2001-2002 in randomised block design, with three replicates and eleven treatment combinations, conoisted post emergence application of Haloxyfop @ 25 g 50 g, 75 g and 100 g a.i. /ha at 14 and 21 days after sowing, PPI application of Trifluralin @12.00 g a.i./ ha. weedy check and weed free check. The results revealed that the weed intensity was low in the treatment spraying of Haloxy fop 10 EC @100 g.a.i./ha at 21 days after sowing of soybean. The weed intensity per m2 was lowest, at 30, 45, 60, 75 and at harvest i.e. 16.33, 23.33, 24.33, 12.66, 6.66 respectively, over rest of chemical weed control measures. However it was on par with the treatment spraying of Haloxyfop 10 EC @ 100 g a.i./ha at 14 day after sowing. In case of WCE % the treatment weed free check gave 100 % WCE. Among the chemical weed control measures the treatment spraying of Haloxyfop 10 EC @ 100 g. a.i./ ha at 21 DAS gave highest (84,02 %) WCE, which was at par with treatment of Haloxyfop 10 EC @100 g a.i./ha at 14 DAS gave (83.32 %) than rest of chemical weed control measures. Seed yield (31.51 q/ ha) registered, high in the treatment weed free check treatment. Which was at par with PPI application of Haloxyfop 75 g.a.i./ha at 14 and 21 DAS.