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Being a resource conservation technology under rice-wheat cropping system, increasing water crisis, lack and high cost labor forced grower to grow rice directly into the field called as direct seeded rice (DSR). High weed infestation impeded the adoption of direct seeded rice by farmers. Various tillage practices, stale seed bed, best selection of competitive rice cultivar, water management, hand weeding and mechanical weeded are components strategies to control weeds in DSR. In this perspective, one option to control weeds through herbicides. Therefore, a field study was conducted to evaluate the efficacy of pre and post emergence herbicides under different sowing methods. Application of bispyribac-sodium + benzsulfuron methyl as post-emergence (POST) following pre herbicides (Ethoxysulfuron ethyl) or as tank-mixture with bispyribac-sodium + benzsulfuron methyl and Oxadiargyl effectively reduced the density and biomass accumulation of diverse weed flora in DSR. High grain yield and 1000 grain weight was recorded in the same treatment under drill sown method of rice plantation. It has been concluded that bispyribac-sodium + benzsulfuron ethyl as post-emergence (POST) following PRE herbicides (Ethoxysulfuron ethyl) or as tank-mixture with bispyribac-sodium + benzsulfuron and Oxadiargyl not only reduce weed biomass and density but also increase the total number of tillers, plant height, number of grains per panicle, 1000 grain weight and grain yield under drill sown method of DSR. The objective of present study was to examine the efficacy of different herbicides applied alone or in sequence to reduce weeds infestation in broadcast and drill sown direct seeded rice.
Keywords: Direct seeded rice; Herbicides; PRE; POST; Weed management