Abstract
K is the third most important plant macronutrient after nitrogen and phosphorus. It is absorbed from soil primarily in the form of K+ and is required in the plants for early growth, production, and modification of proteins, maintenance of water use efficiency, stand persistence, longevity, etc. The total K content in soil exceeds 20,000 ppm which is primarily divided into unavailable, slowly available, and readily available fractions of which readily available fractions constitute only 1–2 % of the total K available in the soil. To mobilize and utilize these large reserves, a viable strategy is the identification and utilization of K-solubilizing microorganisms (KSMs). Soil microbes playing a key role in K cycling have been known since a long time now; therefore, identification of KSMs and their utilization are of prime importance to reduce the fertilizer usage and the effects caused by effective fertilizer usage. Although many bacteria like Acidithiobacillus, Burkholderia, and Pseudomonas have been identified as the potential K solubilizers, a clear cut mechanism has not been reported. However, most solubilization activities of bacteria and fungi have been attributed to the activities like acid hydrolysis of K from minerals present in the soil, chelation by production of some organic acids, etc. Therefore, the content presented in this manuscript explores the applicability of these KSMs, their mode of action, and their percent contribution in K solubilization and availability to the plants.
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Sharma, A., Shankhdhar, D., Shankhdhar, S.C. (2016). Potassium-Solubilizing Microorganisms: Mechanism and Their Role in Potassium Solubilization and Uptake. In: Meena, V., Maurya, B., Verma, J., Meena, R. (eds) Potassium Solubilizing Microorganisms for Sustainable Agriculture. Springer, New Delhi. https://doi.org/10.1007/978-81-322-2776-2_15
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