Effect of first irrigation scheduling and herbicides on productivity of direct-seeded rice (Oryza sativa)
DOI:
https://doi.org/10.59797/ija.v67i1.95Keywords:
Direct-seeded rice, Economics, Herbicides, Irrigation scheduling, Weed-control efficiencyAbstract
An experiment was conducted during the rainy (kharif) season of 2019 at Students’ Research Farm, Khalsa College, Guru Nanak Dev University, Amritsar, Punjab. First irrigation timings, viz. I1 , 7 days after sowing (DAS); I2 , 14 DAS and I3 , 21 DAS, as main plot and herbicidal combinations, viz. W1 , pendimethalin 750 g/ha + bispyribac 25 g/ha at 25 DAS; W2 , pendimethalin 750 g/ha + pyrazosulfuron 20 g/ha; W3, pendimethalin 750 g/ha + pyrazosulfuron 20 g/ha + bispyribac 25 g/ha at 25 DAS; W4 , weedy check and W5 , weed-free as subplot treatments were conducted in a split-plot design with 3 replications. The results showed that, among the first irrigation scheduling, crop-growth parameters (plant height, dry-matter accumulation, leaf-area index); yield attributes (effective tillers, grains/panicle, 1,000-grain weight); grain yield (53.9 q/ha); net returns (`71,326/ha) and benefit : cost (B : C) ratio (2.69) were maximum in I1 treatment. Among the herbicidal combinations, crop-growth parameters, yield-attributing characters, grain yield (57.2 q/ha), net returns (` 79,800/ha), B : C ratio (3.18) and weed-control efficiency were recorded highest in pendimethalin 750 g/ha + pyrazosulfuron 20 g/ha + bispyribac 25 g/ha at 25 DAS. Inclusion of bispyribac with other herbicides performed better in direct-seeded rice.