摘要 : The experiment was conducted during the year 2010. The predominant weed flora observed in the experimental field were, Echinochloa colonum, Cyperus difformis, Cyperus procerus, Euriocolon spp., Monocoria vaginalis, Ammania baccife... 展开 The experiment was conducted during the year 2010. The predominant weed flora observed in the experimental field were, Echinochloa colonum, Cyperus difformis, Cyperus procerus, Euriocolon spp., Monocoria vaginalis, Ammania baccifera, Rotala verticilaries, Ludwizia parviflora and Marselia quadrifolia. The results revealed that among the herbicidal treatments, pre-emergence application of bensulfuron methyl 0.6 per cent G @ 60 g a.i. ha^-1+pretilachlor 6 per cent G @ 600 g a.i. ha^-1 at 3 days after transplanting recorded significantly higher grain yield and straw yield (5212 kg ha^-1 and 5858 kg ha^-1, respectively), lower weed population and their dry weight (23.12/0.25 m² and 4.29 g/0.25 m², respectively). Further, the net returns and B:C ratio was also high with the bensulfuron methyl 0.6 per cent G @ 60 g a.i. ha^-1+pretilachlor 6 per cent G @ 600 g a.i. ha^-1 at 3 days after transplanting (Rs. 40855.65 ha^-1 and 2.93, respectively). 收起