Weed management in direct wet seeded rice

Abstract

Field experiment was conducted at Tamil Nadu Rice Research Institute, Aduthurai during Kuruvai season 2013 to evaluate the weed management practices in direct wet seeded rice. The weed management practices were : Pre-emergence (PE) pretilachlor + safener at 0.45 kg/ha on 3 DAS fb Early post-emergence (EPOE) metsulfuron methyl + chlorimuron ethyl at 4 g/ha on 25 DAS, PE pretilachlor + safener at 0.45 kg/ha on 3 DAS fb EPOE bispyribac-sodium at 25 g/ha on 25 DAS, PE pretilachlor + safener at 0.45 kg/ha fb cono weeder weeding on 25 DAS, PE pretilachlor + safener at 0.45 kg/ha fb drum type weeder weeding on 25 DAS compared with recommended practice of PE pretilachlor + safener at 0.45 kg ha-1 fb hand weeding on 40 DAS, hand weeding on 20 and 45 DAS and unweeded control. The results revealed that the lowest total weed density, total weed dry weight and higher weed control efficency, yield parameters and yield of rice were recorded in hand weeding on 20 and 45 DAS and it was followed by PE pretilachlor + safener at 0.45 kg/ha fb hand weeding on 40 DAS and PE pretilachlor + safener at 0.45 kg/ha fb EPOE metsulfuron methyl + chlorimuron ethyl at 4 g/ha on 25 DAS. However, the net returns and BC ratio were higher in PE pretilachlor + safener at 0.45 kg/ha fb EPOE metsulfuron methyl + chlorimuron ethyl at 4 g/ha on 25 DAS.