Author(s):

Preeti Chaudhary, Vivek, RK Naresh, BP Dhyani and M Sharath Chandra

Abstract: A field experiment was conducted on sandy loam soil at Crop Research Centre of Sardar Vallabhbhai Patel University of Agriculture & Technology, Meerut, U.P. during kharif, 2019 in randomised block design with three replications to study the effect of weed management practices on weed dynamics, nutrient uptake, productivity and profitability of transplanted rice. The treatments comprised of ten treatments of weed management i.e Weedy check, weed free, One hand weeding at 40 DAT+ Bispyribac-Na (25 g a.i/ha) at 15 DAT, Penoxsulam (22 g a.i/ha) at 20 DAT, One hand weeding at 15 DAT+ Penoxsulam (22 g a.i/ha) at 30 DAT, One hand weeding at 20 DAT+ Penoxsulam (22 g a.i/ha) at 35 DAT, One hand weeding at 25 DAT+ Penoxsulam (22 g a.i/ha) at 40 DAT, Pretilachlor (750 g a.i/ha) at 3 DAT + Penoxsulam (22 g a.i/ha) at 20 DAT, Pretilachlor (750 g a.i/ha) at 3 DAT+ Penoxsulam (22 g a.i/ha) at 25 DAT and Pretilachlor (750 g a.i/ha) at 3 DAT+ Penoxsulam (22 g a.i/ha) at 30 DAT were used for the experimentation and different observations were recorded during the crop growth period. The results indicated that the application of Pretilachlor (750 g a.i/ha) at 3 DAT + Penoxsulam (22 g a.i/ha) at 20 DAT significantly reduced the weed population and dry weight over weedy check. The highest weed control efficiency, nutrient uptake and grain yield (38.80 q ha^-1), were recorded with the application of Pretilachlor (750 g a.i/ha) at 3 DAT + Penoxsulam (22 g a.i/ha) at 20 DAT, which established its superiority over rest of the herbicidal treatments. The nitrogen, phosphorus and potassium uptake by rice crop was also highest (77.06, 18.45 and 75.01 kg ha^-1), with the application of Pretilachlor (750 g a.i/ha) at 3 DAT + Penoxsulam (22 g a.i/ha) at 20 DAT and 42.45 and 22.50 per cent increase in grains and straw yield as compared to weedy check in rice crop. The application of Pretilachlor (750 g a.i/ha) at 3 DAT + Penoxsulam (22 g a.i/ha) at 20 DAT resulted into higher gross return, net return and B: C ratio. Thus the application of Pretilachlor (750 g a.i/ha) at 3 DAT + Penoxsulam (22 g a.i/ha) at 20 DAT found better for productivity and profitability of rice crop.

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