The main theme of this study was to evaluate the efficiency of waste mica inoculated with potassium solubilizing bacteria (KSB) as a source of potassium. Pot culture experiment was carried out to see the release of potassium from waste mica inoculated with KSB using sudan grass (Sorghum vulgare Pers.) var Sudanensis as test crop under two Alfisols. Plant biomass yield and K uptake were studied to evaluate whether waste mica improve plant growth and nutrition or not and different pools of K in soil were studied to know how it influence the K dynamics in soil. Though application of waste mica alone improve biomass yield and K uptake over control but bio-inoculation of waste mica further improve biomass yield and K uptake. The dynamics of K in soils indicated that K was released from waste mica due to bio-inoculation in both the soils. Release kinetics of K and X-ray diffraction analysis showed significant release of K from mica treated with bacterial strain. Bacillus mucilaginosus was found most effective among the different bacterial strain. Thus bio-intervention of waste mica could an alternative source of K-fertilizer for sustaining crop production and maintaining soil potassium.