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Comparative Studies of Concomitant Release of Secondary and Micronutrientsby Potassium Solubilizing Bacteria (KSB) from Different Minerals

Potassium solubilizing bacteria releases potassium from insoluble minerals in the soil and provide beneficial effects on plant growth by improving soil nutrients and structure and are also economically viable and environment friendly. Potassium solubilizing bacteria (KSB) shows effective interaction between soil and plant systems. Secondary nutrients are required by plants in very smaller quantities and deficiency of these secondary nutrients limits the growth of crop. Calcium, magnesium are the major secondary plant nutrients. The microbial activity of potassium solubilizing bacteria (KSB) potentially solubilizes the secondary nutrients like magnesium and calcium and micro nutrient zinc along with the solubilization of potassium from rock minerals. The present study was focused on to evaluate the ability of solubilization of secondary and tertiary nutrients by KSB isolates, isolated from two different potassium bearing minerals viz., muscovite mica and orthoclase feldspar. Six KSB isolates were selected for the study and out of the six isolates four isolates were found to be capable of solubilizing calcium, magnesium and zinc. Isolate SBF and SDM were the efficient soubilizer of calcium, magnesium and zinc.