Effect of establishment methods under different weed management technique on rice and associated weeds

An experiment was conducted during rainy (kharif) season of 2011 and 2012 to find out the best weed management technique and crop establishment method of rice (Oryza sativa L.). Both of the transplanting methods being at par recorded significantly higher values of plant height, leaf-area index and grain yield over direct seeding methods. Among weed management practices, two hand weeding (30&50 days) and Bispyribac-Na 25 g ha-1 followed by manual weeding at 50 days at par recorded significantly lower weed weed density & weed dry weight of weeds over Bispyribac-Na 25g ha-1 alone and weedy check treatments. Amongst all the interaction, the maximum grain yield was observed in both of transplanting methods being at par significantly with two hand weeding and Bispyribac-Na 25 g ha-1 at 30 days stage being at par proved significantly. The highest weed control efficiency (89.67%) was recorded in two hand weeding, followed by herbicide + one hand weeding, the highest net profit (Rs 61,372 ha-1) was obtained from the combination of conventional transplanting with herbicide + one hand weeding. However, the highest value of benefit: cost ratio (2.33) was recorded in the treatment with drum seeding with bispyribac Na 25g ha-1 at 30 days.