Herbicide and varying rates of straw mulching on weed dynamics, productivity and profitability of rice
DOI:
https://doi.org/10.59797/ija.v69i4.5866Keywords:
Direct-seeded rice, weed, mulching, rice straw, integrated weed managementAbstract
A field study was conducted in kharif, 2022 at the Agricultural Farm, Binjhagiri, SOA, Odisha, to evaluate the impact of herbicide and varying rates of straw mulching on weeds and rice. Eleven treatments comprised of sole application of herbicides, mulching and their integration were replicated thrice in the randomised block design. The study revealed that among the herbicidal and straw mulching treatments, the application of pendimethalin fb straw mulching at 8 t/ha registered significantly the minimum density and biomass of total and all categories of weeds except broad-leaved weeds at 45 days after sowing. However, it was followed by the application of pendimethalin fb straw mulching at 6 t/ha and pendimethalin fb bispyribac-sodium application. For broad-leaved weeds, the WCE and the density and biomass of pendimethalin fb bispyribac-sodium treated plot were the maximum next to the weed-free treatment. Weed-free plot produced the maximum grain yield of 3.98 t/ha, which was at par with the application of pendimethalin fb straw mulching at 8t/ha (3.86 t/ha), pendimethalin fb bispyribac-sodium (3.77 t/ha) and pendimethalin fb straw mulching at 6 t/ha (3.74 t/ha) treatments. The sequential execution of pendimethalin at 750 g/ha at 1 DAS fb bispyribac-sodium at 25 g/ha at 25 DAS (Rs. 45,282/-) reflected the maximum net returns, which was followed by the integration of pendimethalin at 750 g/ha at 1 DAS fb straw mulching at 6 t/ha at 3 DAS (Rs. 31,056/-) in DSR. These treatments could manage the diverse weed flora and obtain higher grain yield and more significant profit in direct-seeded rice.
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