Studies on effect of integrated weed management practices on nutrient uptake in greengram, Vigna radiata (L) Wilczek

The experiment was carried out to study the effect of integrated weed management practices on nutrient uptake by greengram crop and weeds. Judicious combination of chemical and cultural methods for controlling weeds in greengram effectively maximized nutrient uptake by crop and reduced uptake of nutrients by weeds. It was found that all weed control treatments significantly reduced the N, P and K uptake by weeds at harvest. The nil uptake of N, P and K by weeds and highest total uptake of N (97.16 kg/ha), P (12.56 kg/ha) and K (94.56 kg/ha) by the crop was recorded under weed free treatment which was at par with Pendimethalin 0.75 kg/ha as pre-emergence + Imazethapyr + Imazamox 40 g/ha at 30 DAS as post-emergence, Imazethapyr + Imazamox 60 g/ha at 20 DAS as post-emergence + one hand weeding at 40 DAS, Imazethapyr + Imazamox 40 g/ha at 20 DAS as post-emergence + one hand weeding at 40 DAS, Pendimethalin 0.75 kg/ha as postemergence + Imazethapyr 40 g/ha at 30 DAS as post-emergence, Imazethapyr + Imazamox 60 g/ha at 20 DAS as post-emergence and Imazethapyr + Imazamox 40 g/ha at 20 DAS as post-emergence during the experimentation.