Effect of seed rate and weed management practices on weed dynamics and nutrient removal by weeds

An experiment was conducted at Crop Research Center of Sardar Vallabhbhai Patel University of Agriculture & Technology, Meerut, Uttar Pradesh, India during winter seasons of 2012-13 and 2013-14 to assess the effect of seed rate and weed management practices on weeds and productivity of late sown wheat (Triticum aestivum L.) sowing with 150 kg ha^-1 seed rate recorded minimum density and dry weight of weeds, which was significantly lower than 100 and 125 kg ha^-1 seed rate. The minimum NPK content and uptake by weeds with 150 kg ha^-1 seed rate was lower than 100 and 125 kg ha^-1 seed rate, while N.P.K. content and uptake was maximum with 100 kg ha^-1 seed rate. Among weed management practices minimum weed density, which was at par with Clodinafop + Metsulfuron (60 + 4 g ha^-1), Fenoxaprop-p-ethyl + Metribuzin (120 + 210 g ha^-1) and significantly lower than Sulfosulfuron + Metsulfuron (30 + 2 g ha^-1), Sulfosulfuron 25 g ha^-1 and weedy check was recorded with two hand weeding. Minimum dry matter with two hand weeding was at par with Clodinafop + Metsulfuron (60 + 4 g ha^-1), Fenoxaprop-p-ethyl + Metribuzin (120 + 210 g ha^-1) and significantly lower than Sulfosulfuron + Metsulfuron (30 + 2 g ha^-1), Sulfosulfuron 25 g ha^-1 and weedy check. Maximum NPK content and removal was recorded with weedy check, while minimum with two hand weeding which was at par with Clodinafop + Metsulfuron (60 + 4 g ha^-1), Fenoxaprop-p-ethyl + Metribuzin (120 + 210 g ha^-1) and Sulfosulfuron + Metsulfuron (30 + 2 g ha^-1) and significantly lower than Sulfosulfuron 25 g ha^-1 and weedy check.