Isolation of Strains of Potassium-Mobilizing Bacteria (KMB) for Sustainable Agriculture

Potassium-mobilizing bacteria (KMB) are beneficial soil microorganisms that increase potassium availability by mobilizing immobile K-containing minerals, such as mica, feldspar, and potassium alumina silicates, through the production of organic acids, protons, and chelating agents. KMB also secrete metabolites that can enhance nutrient cycling, stimulate root growth, and interact synergistically with other beneficial microbes in the rhizosphere. The Soil samples (S1–S4) from Chincholikati, Solapur were screened for potassium-solubilizing bacteria. Sample S3 exhibited the highest activity with a halo zone of 6.0 mm, categorized as high K-solubilizing activity. Samples S1 and S4 showed moderate activity, forming halo zones of 4.0–4.2 mm, while S2 displayed low activity with a halo zone of 3.5 mm. These results indicate variability among KMB isolates in their ability to mobilize potassium compounds. The halo zone measurements provide a simple and reliable quantitative assessment of KMB activity for selecting potential strains for soil application. Their activity improves potassium uptake by plants, enhances soil fertility, may reduce application of chemical potassium fertilizers, contributing to sustainable and eco-friendly agricultural practices.

Microbes, Potassium fertilizer, Potassium Mobilizing Bacteria,

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