Evaluation of New Herbicide (Bispyribac sodium 10 SC) on Weed Control and Yield in Direct Seeded Lowland Rice (Oryza sativa)

Field investigation was carried out to evaluate the new formulation of bispyribac sodium 10 SC in direct seeded rice during rabi (August to February) of 2011-12 at Tamil Nadu Agricultural University, Coimbatore. The experiment was laid out in a randomized block design and replicated thrice with the objective to find out the effect of bispyribac sodium 10% SC on weed control efficiency and yield of direct seeded rice. The treatments consist of EPOE application of bispyribac sodium 10% SC at 10, 20, 40 g ha -1 , nominee gold 20 g ha -1 (bispyribac sodium 10 SC) on 15 DAS and PE butachlor 1.5 kg ha -1 , anilophos 0.45 kg ha -1 , pretilachlor S 0.45 kg ha-1 on 3 DAS + HW on 40 DAS and power weeder, conoweeder weeding at 20 and 40 DAS, HW twice on 20 and 40 DAS and unweeded control. Application of pretilachlor S 0.45 kg ha -1 on 3 DAS + HW on 40 DAS registered lower weed density and dry weight at 20 DAS but during the later stages of crop growth EPOE application of bispyribac sodium 10% SC 40 g ha -1 recorded lower weed density and dry weight. The grain and straw yield in both the treatments were comparatively higher than other treatments.