Phosphate Solubilization by Rhizobia Isolated from Woody Legume Plants in Hainan Island Isolation,identification,real-time PCR investigation of an endophytic phosphate-solubilizing bacteria from Caragana korshinskii Kom. Roots Isolation of phosphate solubilizing fungus (Aspergillus niger) from Caragana rhizosphere and its potential for phosphate solubilization Choose 0f phosphate-solubilizing fungal strains with high efficiency in black soil Effect of C, N sources and C/N ratio on the solubilization of rock phosphate by some microorganisms