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Evaluation of Different Potassium Management Options under Prevailing Dry and Wet Seasons in Puddled, Transplanted Rice

Author

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  • Suchismita Mohapatra

    (Siksha’ O’Anusandhan, Deemed to Be University, Bhubaneswar 751003, India
    Orissa University of Agriculture & Technology, Bhubaneswar 751003, India)

  • Kumbha Karna Rout

    (Orissa University of Agriculture & Technology, Bhubaneswar 751003, India)

  • Chandramani Khanda

    (Orissa University of Agriculture & Technology, Bhubaneswar 751003, India)

  • Amit Mishra

    (Banda University of Agriculture & Technology, Banda 210001, India)

  • Sudhir Yadav

    (International Rice Research Institute, Metro Manila 7777, Philippines)

  • Rajeev Padbhushan

    (Bihar Agricultural University, Sabour 813210, India)

  • Ajay Kumar Mishra

    (International Rice Research Institute South Asia Regional Centre, Varanasi 221106, India)

  • Sheetal Sharma

    (International Rice Research Institute, New Delhi 110012, India)

Abstract

The present field experiment was conducted in both dry season (DS) and wet season (WS) from 2014–2015 to evaluate the influence of different potassium (K) management options (graded doses of inorganic K fertilizer alone and combined with foliar and straw incorporation) on the rice yield, nutrient uptake, and soil K balance under puddled, transplanted rice in acidic soil. The results showed that rice yields were higher under WS as compared to the DS crop. Among treatments, K 40 + K spray , i.e., the combination of inorganic K fertilizer (40 kg K 2 O ha −1 ) along with a foliar spray of K (1% KNO 3 ) at the panicle initiation stage, produced the highest grain yield in both seasons; however, it was on par with treatments K 80 , i.e., the highest dose of inorganic K fertilizer (80 kg K 2 O ha −1 ) alone, and K 30 + K straw i.e., integrated use of inorganic K fertilizer (30 kg K 2 O ha −1 ) and straw (3 t ha −1 , 45 kg K 2 O ha −1 ). Application of 80 kg K 2 O ha −1 through inorganic fertilizer alone had the maximum K uptake at the harvest stage in both seasons. DS rice had a higher K/N and K/P ratio than the WS. The treatments applied with inorganic K fertilizers, either soil or foliar applications, had negative K balance in both seasons; however, treatments applied with organic sources of K, i.e., rice straw alone or integrated with inorganic K fertilizers, had positive K balances in the soil. Therefore, this study shows that the integrated use of inorganic K fertilizer and 3 t ha −1 rice straw (K 30 + K straw ) can be a recommended option for a better K management strategy for crop yields and soil sustainability in acid soils. However, in terms of greenhouse gas (GHG) estimation, incremental doses of soil-applied K fertilizer along with straw aggravate the GHGs emission in the rice–rice cropping system, and among all treatments, K 40 + K spray is the promising treatment which requires intensive investigation for drawing an overall conclusion.

Suggested Citation

  • Suchismita Mohapatra & Kumbha Karna Rout & Chandramani Khanda & Amit Mishra & Sudhir Yadav & Rajeev Padbhushan & Ajay Kumar Mishra & Sheetal Sharma, 2023. "Evaluation of Different Potassium Management Options under Prevailing Dry and Wet Seasons in Puddled, Transplanted Rice," Sustainability, MDPI, vol. 15(7), pages 1-17, March.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:7:p:5819-:d:1108721
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    References listed on IDEAS

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