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The field experiment was conducted during kharif season of the year 2013-2014 on red lateritic soil of the Education-cum-experimental Farm, Department of Agronomy, College of Agriculture, Dapoli, Ratnagiri (M.S.) to study Effect of herbicides combinations for control of complex weed flora in direct seeded Rice (Oryza sativa). There have 10 treatments combination, Bispyribac-Na @ 25g/ha, Pendimethalin fb ispyribac-Na @ 1000 fb 25 g/ha, Oxadiargyl fb bispyribac-Na @ 100/25 g/ha, Pyrazosulfuron fb bispyribac -Na @ 20/25 g/ha, Pendimethalin fb bispyribac-Na fb manual weeding @ 1000 fb 25 g/ha, Pendimethalin fb manual weeding (Pendistar) @ 1000g/ha, Bispyribac -Na + (chlorimuron + metsulfuron) @ 20+4g/ha, Three mechanical weedings (cono / rotary weeder), Weed free check (HW at 20,40, and 60 DAS) and Weedy check. The present study revealed that as Various weed control measures tried significantly influenced growth of monocots during all the years of experimentation and in pooled results. During 1st year use of Pendimethalin fb manual weeding significantly reduced growth of monocots as compared to use of Bispyriback-Na, Pendimethalin fb Bispyriback-Na,Pyrazosulfuron fb Bispyribac-Na and weedy check and remained at par with rest of the treatments, while, during the year 2013, 2014 and in pooled results, use of pendimethaline fb manual weeding recorded significantly lowest weed growth than rest of the treatment except Pendimethalin fb manual weeding and weed free check and weed free check produced significantly higher grain and straw yield (40.56 and 48.96 qha-1) respectively over rest of the treatments except the use of pendimethaline fb manual weeding (38.34 and 45.50 qha-1) and Pendimethalin fb Bispyriback-Na fb manual weeding (37.08 and 45.74 qha-1) which were at par with weed free check. Thus compared to best treatment of weed free check the percent reduction in the grain yield, (WCI) was found to be least in case of pendimethalin fb manual weeding (5.47%) followed by Pendimethalin fb Bispyriback-Na fb manual weeding (8.58 %) in 2013 & 2014.
Key words: Direct seeded Rice, Different herbicides, weed growth, yield attributing characters and chemical composition.