Abstract: Seven strains of phosphorus solubilizing bacteria were screened out of red soils under different land use patterns and cultured for determination of characteristics,growth rate and phosphorus solubilizing capability.Results show that their HD/CD ratios ranged from 1.47 to 3.45,and their phosphorus solubilization rate in broth culture were in the range between 11.27 and 136.27 mg·L^-1,showing they were all quite high in phosphorus solubilizing capacity.Strain CY06 was the highest among the seven,and moreover it seemed to be more efficient in solubilizing AlPO₄ than in other insoluble phosphates.So,it is a promise microbial resource for development of high efficiency biological phosphorus fertilizer.

Key words: red soil, phosphorus-solubilizing bacteria, screening, phosphorus solubilizing capability