Impact of weed control treatments on weed flora, nutrient uptake by weeds and blackgram crop

Experimental site constituted by monocot weeds viz., Panicum colonum L., Brachiaria spp., Eluropus villosus L., Commelina benghalensis L., Eragrostis major Host., dicot weeds viz., Amaranthus viridis L., Digeria arvensis Forsk, Indigoflora glandulosa L., Euphorbia hirta L., Boerhavia diffusa L., Celosia argentea L., Leucas aspera Spreng and Portulaca oleracea L. and sedges viz., Cyperus rotundus L., weed free condition and application of pendimethalin 1 kg/ha pre-emergence+1 HW+IC at 40 DAS proved effective in reducing total weed density and dry weight of weeds and recorded significantly highest uptake of N, P and K by crop and lowest uptake by weeds.