Response of rice (Oryza sativa) genotypes to weed management in rainfed ecosystems of eastern India
DOI:
https://doi.org/10.59797/ija.v61i1.4343Keywords:
Economics, Herbicides, Rice genotypes, Weeds, YieldAbstract
An experiment was conducted during the rainy seasons of 2013 and 2014 at Patna, Bihar, to study perfor- mance of 9 rice (Oryza sativa L.) genotypes (Sahbhagi Dhan, Sushk Samrat, CR Dhan 40, Abhishek, IR 84899-B-183-CRA-19-1, IR 83387-B-B-40-1, IR 82870-11, IR 83387-B-B-27-4 and IR 83376-B-B-24-2) under 2 weed-management levels [pendimethalin 1.0 kg/ha followed by (fb) bispyribac-sodium 30 g/ha at 20 days after sowing (DAS) and 2 hand-weedings at 45 and 65 DASlow weed pressure; and pendimethalin 1.0 kg/ha alone medium weed pressure] in the rainfed ecosystem of eastern India. The field was infested mainly with barnyard grass [Echinochloa colona L. (Link)], horse purselane (Trianthema portulacastrum L.), native gooseberry (Physalis minia), purple nutsedge (Cyperus rotundus L.) and lesser fimbristylis [Fimbristylis miliacea L. (Vahl.)]. Significant genotypic differences in competitiveness against weeds were observed. Weed-competitive index was the highest (1.5) for IR 84899-B-183-CRA-19-1 and the lowest (0.43) for IR 83376-B-B-24-2. Grain-yield reduction among the cultivars due to weed competition varied from 6.6% in IR 82870-11 to 30.4% in Sahbhagi Dhan during 2013 and 6.5% in IR 82870-11 to 52.3% in Shusk Samrat during 2014. Across the weed pressure, rice genotype IR 84899-B-183-CRA-19-1 (2.75 and 2.28 t/ha) had higher grain yield during both the years. The advanced breeding line IR 84899-B-183-CRA-19-1 and the released variety CR Dhan 40 had superior weed-suppressing ability, while IR 83387-B-B-27-4 had the higher weed tolerance. Pre-emergence application of pendimethalin fb post- emergence application of bispyribac-sodium and hand-weeding significantly reduced the weed infestation and re- sulted in higher yield and profits in dry direct-seeded rainfed upland rice.References
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