Plant nutrition is the study of the mineral elements that are necessary for good plant growth and reproduction. Plant nutrition is closely associated with the activity of plant growth promoting rhizobacteria (PGPR), including potassium and zinc solubilizing bacteria (KSB and ZnSB) which are used, as bio fertilizer in many countries that where in soil are deficient in available potassium and zinc. In soils, K occurs in the form of silicate minerals viz., muscovite, orthoclase, biotite, feldspar, illite, mica, vermiculite, smectite etc. Total pool of soil K is extremely complex and this can be solubilized by bacteria through production of acids and it will be available for plant (Ullaman et al., 1996). The use of plant growth promoting rhizobacter (PGPR), including potassium solubilizing bacteria (KSB) as biofertilizers, was suggested as a sustainable solution to improve plant nutrition and production (Badar et al., 2006).