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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
 
Creator Saiful Islam
Gathala, Mahesh K.
Timsina, Jagadish
Dutta, Sudarshan
Muhammad Salim
Majumdar, Kaushik
 
Subject potassium
soil
rice
cropping systems
 
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.
 
Date 2023-07-27
2023-08-08T22:19:31Z
2023-08-08T22:19:31Z
 
Type Journal Article
 
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
 
Language en
 
Rights Copyrighted; all rights reserved
Limited Access
 
Publisher Taylor and Francis
 
Source Communications in Soil Science and Plant Analysis