Effect of some new post-emergence herbicides on weed parameters and seed yield of soybean (Glycine max)

A field experiment was conducted during the rainy season of 1996 and 1997 at Crop Research Centre, Pantnagar, on silt-loam soil to study the effect of post-emergence herbicides and their rates on the weed parameters and seed yield of soybean [Glycine max (L.) Merr.]. Plant height, number of trifoliates, dry matter/plant, yield attributes and seed yield of soybean, weed dry matter and weed density were significantly affected by herbicides. Highest seed yield and seed-production efficiency were obtained under 2 hand-weedings at 30 and 45 days after sowing and with anilophos @ 1.75 kg ai/ha, propaquizafop @ 75 g ai/ha and imazethapyr @ 100 g ai/ha, respectively, during 1996 and 1997.