Suma C. Kammar, Ravindra C. Gundappagol, Shubha S., Santhosh, G. P. and Ravi, M. V.*

Department of Agricultural Microbiology, *Department of Soil Science and Agricultural Chemistry, University of Agricultural Sciences, Raichur – 584 102, Karnataka, India.

Received on 19 August 2016 and accepted on 03 October 2016



The experiment was conducted to isolate KSB from 75 rhizosphere soils of different crop plants around Raichur district. Out of these, 28 isolates were selected as potential Potassium Solubilising Bacteria (KSB) based on zone of solubilisation and further these isolates were tested for morphological and biochemical characterization. Whereas five (KSBL-12, KSBR-28, KSBR-44, KSBD-55 and KSBD-72) isolates were identified as Pseudomonas and remaining 23 as Bacillus. Among the isolates KSBD-58 released maximum amount of K from muscovite mica (42.95 ìg ml-1) which was significantly higher than all other isolates including the reference strain (Frateuria aurantia) which released potassium of 38.95 ìg ml-1. All the isolates produced one or the other organic acids.

Keywords :

 KSB, Bacillus mucilagenosus, Frateuria aurantia, Bacillus edaphicus.