Economics, Herbicide, Transplanted rice, Integrated weed management

The present study was conducted to quantify the effect of different weed control treatments alone or in combination with each other on weed growth and grain yield of transplanted rice during Kharif season of 2012 at G.B. Pant university of Agriculture and technology, Pantnagar, Uttarakhand. Different weed species responded variably to tested weed control treatments. The dominant weeds in experimental plots were Echinochloa colona, E. crusgalli, Leptochloa chinensis, Ischeamum rugosum among grasses and Ammania baccifera, Alternanthra sessilis and Ceasulia axillaris among broad-leaf weeds and Cyperus difformis was the only sedge. Pre-emergence application of pretilachlor 750 g/ha without water stagnation in the field up to one week fb post-emergence application of bispyribac-Na 20 g/ha was found superior to rest of the treatments.