Abstract

                                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.

Key words : Soluble concentration, Early post emergence, Rice, Weed management