Weed management in rice (Oryza sativa)–fallow for enhancement in productivity and profitability of rice–zero till toria (brassica campestris) system

摘要

© 2020, Indian Society of Agronomy. All rights reserved.A field experiment was conducted during 2013–14 and 2014–15 at Bhubaneswar, Odisha, India to develop management practices for rice (Oryza sativa L.)–toria (Brassica campestris L.) cropping system in rice fallows. During the rainy season (kharif), 7 crop-establishment methods were tried in rice in randomized block design with 3 replications. During winter (rabi) season zero-till toria was raised on residual soil-moisture conditions. The residual effects of 7 crop-establishment methods imposed in rice and 3 weed-management practices in succeeding toria were tried in split-plot design with 3 replications. Pooled over seasons, transplanting in rice + bispyribac-Na @ 0.02 kg/ha at 21 days after transplanting (DAT) + mechanical weeding at 35 DAT and sequential application of glyphosate 1.0 kg/ha as pre-planting desiccation (PPD) and quizalofop ethyl 0.05 kg/ha as post-emergence recorded the maximum rice-equivalent yield of 5,792 kg/ha and 2 treatment combinations, viz. transplanting + bispyribac-Na @ 0.02 kg/ha (21 DAT) + mechanical weeding (35 DAT) in rice and glyphosate 1.0 kg/ha (PPD) alone or quizalofop ethyl alone in toria recorded similar system yield. Transplanting in rice + bispyribac-Na @ 0.02 kg/ha at 21 days after sowing (DAS) + mechanical weeding (35 DAS) and glyphosate 1.0 kg/ha in toria gave the maximum system net return of 40,392/ha. Line sowing in direct-seeded rice with pendimethalin as pre-emer-gence spray + hand-weeding (35 DAS) or transplanting in rice with bispyribac-Na @ 0.02 kg/ha as post-emer-gence spray (21 DAS) + mechanical weeding (35 DAS) and glyphosate 1.0 kg/ha (PPD) in toria may be recommended for maximizing productivity and profitability.