Effect of Weed Management Practices on Nutrient Content and Their Uptake by Black Gram Crop (Vigna mungo L.)

Aim: To study the effect of weed management practices on nutrient content and uptake by black gram. Study Design: Randomized block design. Place and Duration of Study: One year field experiment at Research Farm, School of Agriculture, Abhilashi University, Chail Chowk, Mandi, (H.P.). Methodology: The experiment was conducted with three replications and seven treatments viz.- T1 = Weedy check, T2 = Weed free, T3 = Hand weeding (20 & 40 DAS), T4 = Imazethapyr @ 70 g ha-1 (PE) + Hand weeding (30 DAS), T5 = Metolachlor @ 1.0 kg a.i. ha-1 (PE) + Hand weeding (30 DAS), T6 = Pendimethalin + Imazethapyr 900 g a.i. ha-1 (3-4 leaf stage), T7 = Imazethapyr + Imazamox @ 70 g a.i. ha-1 (PoE). Results: The study of data revealed non-significant impact of weed management practices on nitrogen, phosphorous and potassium in grains and straw of black gram crop, whereas, the maximum content of all these nutrients were found under treatment T2. However, the application of treatment T2 also recorded the significantly maximum uptake of nitrogen, phosphorous and potassium by grains, straw and total uptake by black gram crop, which was statistically at par with treatment T3. The minimum content of nitrogen, phosphorous and potassium in grains, straw and along with their uptake by grains, straw and total uptake by black gram crop were found under treatment T1 = Weedy check during the field experiment. Conclusion: This study showed non-significant effect of weed management practices on the nutrient content in grains and straw of black gram, while, it has significantly affected the nutrient uptake by grains, straw and total uptake by black gram crop.