Inorganic and organic phosphate solubilization potential of Stenotrophomonas maltophilia

Abstract Most soils contain Phosphorus (P) in insoluble compounds as organic and inorganic forms which is unavailable to plants. Furthermore, phosphate solubilizing bacteria (PSB) play an important role converting P a bioavailable form through mineralizing or P. Therefore, this study aims determine the ability of isolate bacterium (PSB), Stenotrophomonas maltophilia solubilize The was isolated from peat soil West Kalimantan using Pikovskaya medium added with Ca 3 (PO 4 ) 2 source. activity (acid phosphatase phytase) measured p-nitrophenyl disodium ( p NPP 0.115 M) sodium phytate substrate bacterial broth culture. Also, optimization for solubilization by conducted. maximum values recorded be 52.26 μg/mL 44.51 U/mL phosphatase), 0.13 (phytase) respectively. Optimum conditions found were temperature at 30 °C, pH 6.0 presence sucrose beef extract, serve carbon nitrogen sources, it can probably used biological fertilizer