Phosphate Solubilization Of Two Isolates In Calcareous Soil And Acid Soil

Two phosphate-solubilizing microorganisms of Aspergillus sp.2TCiF2 and Arthrobacter sp.lTCRi7 were inoculated into one calcareous soil and one acid soil. The soils were sterilized and then amended with glucose or straw and rock phosphate or superphosphate at same time. The aim was to investigate the role of the microorganisms in P transformation of the two soils. The results showed that both microorganisms could develop in the soils. Carbon sources were essential for their dissolving phosphate. Available P level in the soils had effect on the phosphorus transformation. Addition of rock phosphate and straw in the calcareous soil were benefit to the growth of Aspergillus sp. and Arthrobacter sp. The soil total available P increased significantly due to the microbial inoculation. It was also found that most part of the solubilized P formed microbial biomass P and the soil available P wasn't increased significantly. In the acid soil, glucose added together with rock phosphate, comparing with straw, was suitable to the fungal growth. In the treatments without rock phosphate, the fungal isolate increased soil available P, especially in the middle stage of the incubation. Superphosphate was suitable to the bacterial growth and solubilizing phosphate.