Efficacy of herbicides and mulching for controlling weeds in transplanted rice

摘要

The efficacy of selected herbicides along with mulching for weed control in transplanted rice was evaluated under temperate conditions of Kashmir during wet seasons of2006 and 2007. All the weed control treatments were superior to weedy conditions. Butachlor (1kg a.i. ha~(-1)3-5 days after transplanting) + brown sarson (Brassica campestris) straw mulching and pretilachlor (1 kg a.i. ha~(-1) 3-5 days after transplanting) + brown sarson straw mulching had a mean grain yield of 9.3 and 9.2, respectivelyand were significantly superior to herbicide combination treatments viz. butachlor (1 kg a.i. ha~(-1)) followed by (fb) 2,4-D (0.5 kg a.i. ha~(-1) 20 days after transplanting) or pretilachlor (1 kg a.i. ha~(-1)) 2,4-D (0.5 kg a.i. ha~(-1)). All the weedcontrol treatments resulted in higher uptake of nitrogen. Among weed control combination treatments, butachlor (1kg ha~(-1)) + brown sarson straw mulching and pretilachlor (1 kg a.i. ha~(-1)) + brown sarson straw mulching proved most profitable with netreturns of Rs 35,813 ha~(-1)and Rs 35,294 ha~(-1)and benefit: cost ratio of 1.63 and 1.60, respectively.