Integrated Weed Management in Soybean (Glycine max L.)

Abstract

Soybean is a rainy season crop and intense weed competition during the active phase of growth is one of the constraints in realizing higher soybean productivity. Yield reduction in soybean due to poor weeds management ranges from 12 to 85 per cent depending on weed flora and their density. Present study was conducted during kharif season of 2014, 2015, 2016 in Nashik Dist., to study the effect of different weed management practices on growth and yield of soybean, to test the efficacy of promising weed control practices in soybean, to study the weed dynamics in soybean. Growth contributing characters viz. plant height spread, number of branches and dry matter and yield contributing characters like number of seeds pod-1, number of pods plant-1, weight of pods plant-1, 1000 grain weight, grain and straw yield were found significantly superior in weed free check followed by pendimethalin @ 1kg a.i. ha-1 fb one hoeing at 30 DAS. The treatment weed free check recorded significantly highest grain and straw yield followed by pendimethalin @ 1kg a.i. ha-1 fb one hoeing at 30 DAS as compared to weedy check. As regards the economics of different weed treatments pendimethalin @ 1kg a.i. ha-1 fb one hoeing at 30 DAS recorded highest net monetary returns and benefit : cost ratio followed by Imazethapyr@ 0.15kg a.i. ha-1 (POE) at 15 DAS fb hoeing at 30 DAS and Thus, in integrated weed control method, chemical plus mechanical methods like pendimethalin plus hoeing in combination were found economical in controlling weeds in kharif soybean.