Author(s): Shailesh K Singh, SK Tomar, M Kumar and TS Tomar

Abstract: An on farm trial was conducted during kharif 2018 and 2019 to find out the most promising herbicide combination in puddled direct seeded rice (DSR) sown with drum seeder using sprouted seed. All the doses of herbicides significantly reduced the dry matter production of weeds. The highest grain yield (53.2 q/ha) was obtained with application of pyrazosulfuron @200 g fb application of bispyribac sodium @ 250 ml/ha at 30 days after sowing (DAS). This treatment was significantly superior to other herbicidal treatments. On an average weed population of 955/m2 was recorded in weedy check plot. Highest weed control efficiency and lowest weed population and weed dry weight was recorded with application of Pyrazosulfuron 10 WP @ 250 g /ha at puddling fb by bispyribac sodium 10 SC at 30 DAS closely followed by pyrazosulfuron @200 g at puddling fb bispyribac sodium @ 250 ml/ha at 30 DAS and pyrazosulfuron @200 g/ha at 3 DAS fb bispyribac sodium @ 250 ml/ha at 30 DAS. Unchecked weed growth reduced the crop yield by 72.1 percent when compared with Pyrazosulfuron 10 WP @ 200 g/ha at puddling fb by bispyribac sodium 10 SC at 30 DAS. This treatment was found most economical too. The second most economical treatment was pyrazosulfuron @200 g at 3 DAS fb bispyribac sodium @ 250 m l/ha at 30 DAS.

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