Potassium supplying capacity and contribution of non-exchangeable potassium in wetland rice soils in Bangladesh
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Title |
Potassium supplying capacity and contribution of non-exchangeable potassium in wetland rice soils in Bangladesh
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Creator |
Saiful Islam
Gathala, Mahesh K. Timsina, Jagadish Dutta, Sudarshan Muhammad Salim Majumdar, Kaushik |
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Subject |
potassium
soil rice cropping systems |
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Description |
Information on soil potassium (K) supplying capacity, K-depletion, and contribution of exchangeable and non-exchangeable K in wetland rice ecology is limited. Understanding of K dynamics of different soil types can be a guideline for better K-fertilizer management and sustainable soil K use to achieve sustainable rice yields. To understand this soil K-supplying capacity to rice plants, a pot study with two K levels (K0 and K100 mg K kg-1 soil) was conducted with seven successive rice crops grown up to the panicle initiation stage using 18 different soils collected from across Bangladesh. The cumulative soil K-supplying capacity (242–758 mg K kg-1 soil) varied significantly (P ≤.001) among soils, showing a strong positive relationship (R2 = 0.78) with NH4OAc K. The potential K-supplying capacity of these soils was the highest (758 mg K kg-1 soil) in Mithapukur (AEZ 3-Tista Meander Floodplain) and the lowest (242 mg K kg-1 soil) in Barura (AEZ 19-Old Meghna Estuarine Floodplain). In K0 soils, the successive cycles of rice resulted in continuous depletion of both non-exchangeable and exchangeable K pools. The concentration of both exchangeable and non-exchangeable K was maintained and almost balanced in K100 soils compared to K0 with successive rice cropping. Non-exchangeable K contribution to K nutrition of rice plants during the seventh cropping ranged, respectively, from 83% to 93% and 26% to 55% in K0 and K100 soils. Results reveal the importance of a non-exchangeable K pool in K-supplying to plants in wetland rice production systems with different soil types.
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Date |
2023-07-27
2023-08-08T22:19:31Z 2023-08-08T22:19:31Z |
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Type |
Journal Article
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Identifier |
Islam, S., Gathala, M. K., Timsina, J., Dutta, S., Salim, M., & Majumdar, K. (2023). Potassium sup-plying capacity and contribution of non-exchangeable potassium in wetland rice soils in Bangladesh. Communications in Soil Science and Plant Analysis 54(20):2745–2762.
0010-3624||1532-2416 (Online) https://hdl.handle.net/10568/131508 https://doi.org/10.1080/00103624.2023.2240853 |
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Language |
en
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Rights |
Copyrighted; all rights reserved
Limited Access |
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Publisher |
Taylor and Francis
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Source |
Communications in Soil Science and Plant Analysis
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