Author(s): Karunai Selvi B, Ravindran AD
Phosphate solublization activity of Bacillus subtilis in different carbon and nitrogen sources with insoluble form of phosphate sources like tricalcium phosphate and rock phosphate were studied. TCP solubilization with different carbon sources irrespective of incubation period can be related in the following order: glucose, fructose, arabinose, mannose, sucrose, lactose, and sorbitol. The pH drifted from neutral to acidic with all carbon sources in presence of TCP. All the sugars with rock phosphate did not have any marked influence on phosphate solubilization activity. Regarding TCP and RP solubilization with different nitrogen sources maximum solubilization was recorded in the presence of ammonium sulphate. Bacillus subtilis showed maximum PS with glucose and ammonium sulphate. RP solubilization in liquid medium was very slow.