Vol. 16 No. 2
Efficacy of different nitrogen levels and herbicides on weed dynamics in basmati rice under temperate conditions of Kashmir valley
Abstract: A Field experiment was conducted at Mountain Research Center for Field Crops (MRCFC), Khudwani, during Kharif 2018 on silty clay loam soil to evaluate three nitrogen levels(0, 45 & 90 kg N ha-1 )and five weed management practices. Florpyrauxifenbenzyl (Rinskor, W1) @ 31.25 ml ha-1 and penoxsulam (Granite 240 SC, W2) @ 22.5 g ha-1were applied as early post emergence herbicides at 10 days after transplanting (DAT), and pyrazosulfuron-ethyl @ 60 g ha-1 + pretilachlor @ 300 g ha-1 (Eros, W3) as a pre-emergence herbicide at 3 DAT besides, weed free (W4) and weedy check (W5) were tested to ascertain the most effective nitrogen level and herbicide for control of weeds in basmati rice (Shalimar Sugandh 1). Nitrogen levels showed a non-significant effect on the weed densities however, 90 kg N ha-1application resulted in highest weed dry matter and lowest weed index. Penoxsulam @ 22.5 g ha-1 significantly controlled nearly all the weeds in basmati rice, followed by pyrazosulfuron-ethyl @ 60 g ha-1 + pretilachlor @ 300 g ha-1 and hence showed the highest weed control efficiency. Highest benefit-cost ratio (B:C)of 3.91 was realized with a combination of 90 kg N ha-1 and penoxsulam application @ 22.5 g ha-1.
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