Effect of pre emergence herbicides on weed control in soybean (Glycine rnax)

Abstract

A field experiment was conducted at the Indian Agricultural Research Institute, New Delhi, during the rainy seasons of 1995 and 1996, to evaluate the effect of , pre emergence herbicides on weed control in soybean [Glycine max (L.) Merr.]. All weed control treatments reduced the weed biomass and population of all the weeds except Cyperus rotundus L. and Convolvulus arvensis L. Pre emergence application of Metribuzin at low dose (0.5 kglha) lowered the weed population and weed biomass than that of pendimethalin (1.0 and 1.5 kgfha) and it was as good as 2 hand weedings done 20 and 40 days after sowing. But application of . Metribuzin at higher dose (0.75 kglha) had a little phytotoxic effect on soybean seedlings. The former registered the maximum seed yield (23.42 qfha), net monetary return (Rs 9,590lha) and benefit :cost ratio (2.22) among all the weed control treatments. Weed control treatments proved more remunerative than weedy check.