The systematic survey was made to isolate efficient strains of potassium solubilizing bacteria from different crop plant rhizosphere such as Sorghum, Maize, Bajra, Cotton, Sunflower and Groundnut. A total of 75 isolates were isolated, based on the results obtained from in vitro studies 28 best isolates were selected. The diameter of zone of solubilisation formed by isolates ranged from 0.30 cm to 1.40 cm at 72 hours after incubation. The isolate, KSBD-58 showed maximum solubilisation zone of 1.40 cm, which was followed by KSBR- 41 (1.30 cm). Based on the morphological characterization it was revealed that out of 28 isolates 25 were Bacillus and five were Pseudomonas. With respect to biochemical characterisation all isolates tested positive for catalase, urease and acid production and negative for voger proskauer, denitrification and H2S production test.
KSB, Bacillus, Pseudomonas, Fratueuria aurantia.
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