Phosphorus is one of the essential macro-minerals for growth and development of plant. The main objective ofthis study is to isolate the PSB and screened for its solubilization efficiency on Pikovskaya’s agar and broth at differentincubation period. Totally 40 PSB were isolated from paddy rhizosphere soils of Raichur and Koppal districts. PSBisolates were studied for zone of solubilization, solubilization efficiency, solubilization index, pH change, titrable acidityand phosphatase activity. The solubilization zone, efficiency and index were highest on sixth day of incubation period.From that 10 isolates were found to be good phosphate solubilizer. Among 10 isolates, isolate PPSB-21 showed highestzone of solubilization (18.4 mm) phosphate solubilization efficiency (253.84%) and solubilization index (3.53) on Pikovskaya’smedium. These efficient isolates can be used as biofertilizer