Performance of Post-Emergence Herbicides in Rice-Lentil Cropping Sequence under Coastal Saline Zone of West Bengal
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Authors
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TAKBIR ALI
Department of Agronomy, Faculty of Agriculture, Bidhan Chandra Krishi Vishwavidyalaya, Mohanpur, Nadia - 741 252, West Bengal, India
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CHANDAN DE
Department of Agronomy, Faculty of Agriculture, Bidhan Chandra Krishi Vishwavidyalaya, Mohanpur, Nadia - 741 252, West Bengal, India
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PRABAHA MAITY
Department of Agronomy, Faculty of Agriculture, Bidhan Chandra Krishi Vishwavidyalaya, Mohanpur, Nadia - 741 252, West Bengal, India
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KOUSHIK BRAHMACHARI
Department of Agronomy, Faculty of Agriculture, Bidhan Chandra Krishi Vishwavidyalaya, Mohanpur, Nadia - 741 252, West Bengal, India
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RAJIB KUNDU
Department of Agronomy, Faculty of Agriculture, Bidhan Chandra Krishi Vishwavidyalaya, Mohanpur, Nadia - 741 252, West Bengal, India
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SUKAMAL SARKAR
Division of Agronomy, School of Agriculture and Rural Development, Ramakrishna Mission Vivekananda Educational and Research Institute, Narendrapur, Kolkata - 700 103, West Bengal, India
Keywords:
Coastal saline zone (CSZ), Direct seeded rice (DSR), Post-emergence herbicides, Weed IndicesAbstract
The transition from puddled transplanted rice to direct-seeded systems in saline-prone coastal areas of West Bengal necessitates strategic weed management measures to ensure crop viability. A field experiment was conducted during the kharif seasons of 2021 and 2022 at Rangabelia, Gosaba Block of South 24 Parganas district, West Bengal (21.92o N latitude and 88.80o E longitude with an elevation 4 m. above mean sea level) to evaluate the efficacy of herbicides in controlling weed flora, enhancing rice yield, herbicidal phyto-toxicity and nutrient uptake pattern for achieving the optimization of dose of these chemicals for sustainable direct seeded rice production and assessing their residual impact on the succeeding lentil crop. The study was laid out in a randomized complete block design with seven treatments including three doses of pyribenzoxim 5% EC (25, 30 and 35 g a.i. ha-1), fenoxaprop p-ethyl 6.7% EC (56.06 g a.i. ha-1), oxadiargyl 80% WP (100 g a.i. ha-1), weed-free and weedy check plots. Pyribenzoxim 5% EC at 35 g a.i. ha-1 was found to be the most cost effective (B:C=1.76) significantly reducing the total weed density (61.81%) and its dry weight (60.71%) at 30 days after application, enabling the rice crop to mine maximum amount of plant nutrients and ultimately resulting in the highest rice yield (3.45 t ha-1). Moreover, no adverse residual effects were observed on succeeding lentil crop, indicating its safety and suitability in a rice-lentil cropping system. Therefore, pyribenzoxim 5% EC at 35 g a.i. ha-1 can be recommended as an effective and sustainable herbicide for direct seeded rice (DSR) in the coastal saline ecosystem of West Bengal.
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