Effect of irrigation and herbicide on yield and weed dynamics in hybrid rice in West Bengal

To study the effect of different levels of irrigation and weed management on yield and weed population on transplanted hybrid rice (Oryza sativa L.), a field experiment was conducted in sandy clay loam soil of Jaguli Instructional Farm, Bidhan Chandra Krishi Viswavidyalaya, Nadia (West Bengal) during pre-kharif season of 2007. The experiment was laid out in split plot design with 4 irrigation treatments in main plots and 4 weed control treatment in sub-plots which was replicated thrice. The predominant weeds were Echinochloa crus-galli, Cynodon dactylon, Cyperus difformis, Alternanthera philoxeroides, and Monochoria vaginalis. Continuous submergence of 5±2 cm depth of water (I₁) and hand weeding twice at 25 and 45 DAT (W₃) recorded higher growth, yield and minimum weed population than other treatments.