Assessment of Phosphate Solubilization and Indole Acetic Acid Production of Phosphate Solubilizing Bacteria Isolated from Acid Soils, Lampung, Indonesia

Phosphorus is the main macronutrient required by plants for growth and development. in soil bonds with metals such as Al Ca, especially acid soils ultisols. This form of phosphate must be mineralized or dissolved using solubilizing bacteria. The ability to dissolve also correlates production Indole Acetic Acid (IAA), which can increase plant growth. study aims assess dissolution IAA three bacteria (EF.NAP 5, EF.NAP 7, 10) have been isolated from soils, Lampung. method used was clear zone test bacterial isolates, solubility, measurement during solubility process. 5 10 isolates had indexes 0.986 (6th day), 0.828 (7th day) 0.789 (3rd respectively. 7 isolate (392.87 mg/L) able better than (311 (213.37 mg/L). pH conditions on highest were (4.94), (4.19) (6.01), produce dissolving process Liquid Pikovskaya medium without addition Tryptophan concentrations (12.5 mg/L), (8.0 (8.5