Yield, nutrient uptake and economics of soybean under different weed management practices
2018
Singh, S. P. | Singh, J.P. | Bhatnagar, Amit | Kumar, Amit | Yadav, Ajit | Gupta, Gaurendra | Kumari, Usha | Verma, Gaurav
A field experiment was conducted during kharif season of 2014 at GBPUAT, Pantnagar (Uttarakhand)to find out the effect of integrated weed management options on soybean. The experiment waslaidout in a randomized block design with four replications to evaluate ten treatments viz. Preemergenceapplication of herbicide, sulfentrazone 48% SC @ 300 g a.i/ha, sulfentrazone 48% SC @360 g a.i/ha, sulfentrazone 48% SC @ 360 g a.i/ha + hand weeding (HW) at 40 (DAS) days aftersowing, sulfentrazone 48% SC @ 300 g a.i/ha + HW at 40 DAS, pendimethalin 30 EC @ 750 g a.i/ha,pendimethalin 30 EC @ 1000 g a.i/ha, pendimethalin 30 EC @ 750 g a.i/ha + HW at 40 DAS andpendimethalin 30 EC @ 1000 g a.i/ha +HW at 40 DAS, weed-free and weedy check. Weed-free plotrecorded higher grain yield (2.99 t/ha) followed by pre-emergence application of sulfentrazone48% SC @ 360 g a.i/ha + HW at 40 DAS. The highest nutrient (NPK) uptake (255.2, 37.2, 110.6 kg/ha) by crop was recorded under weed-free plot treatment. The highest net returns (Rs 49,037/ha)and benefit: cost ratio (1.76) were recorded under pre-emergence application of sulfentrazone 48%SC @ 360 g a.i/ha + HW at 40 DAS. Thus, it could be concluded that pre-emergence application ofsulfentrazone 48% SC @ 360 g a.i/ha + HW at 40 DAS can be used for effective weed control insoybean.
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