Rice (Oryza sativa L.) production in India is an important part of the national economy. India is the world's 2nd largest rice producer with approximately 43 Million hectares planted area, accounting for 22% of the world’s rice production. Silica as beneficial element has function for its cell strength in growth and development of paddy, which is accumulated 10% of its dry weight. In the present study was collected twenty (20) direct sown paddy rhizosphere soil samples from four districts of Andhra Pradesh and recorded their geographical position of collected soil samples. From that twenty eight (28) Silica Solubilizing Bacteria (SiSB) isolated by using magnesium trisilicate (0.25 %) as an insoluble source of silica in Bunt and Roviramedia. Silica solubilizing isolates coded based on their soil sample collected geographical position, recorded the morphological, cultural characteristics of SiSB. SiSB isolates screened based on their silica solubilization efficiency both qualitatively and quantitatively. Among all 28 SiSB isolates SiKPP-1 has the high ability to solubilize silica both qualitatively and quantitatively (12.41 mm & 2.16 ppm) followed by SiPYY-3 (12.02 mm & 2.12 ppm) and lowest was showed by SiAGG-1 (5.20 mm & 0.52 ppm). SiKPP-1 showed the positive for the Starch hydrolysis test, Indole production test, Catalase test, Oxidase test, Gelatine liquefaction test, Methyl red test, Vogues Proskauer test, Citrate Utilization test and Ammonia production test. SiKPP-1 showed the negative result for Hydrogen sulphide test.

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