Phosphate solubilization in solid and liquid media by soil bacteria and fungi

Abstract

The objective of this work was to evaluate the ability and efficiency of solubilization of CaHPO₄, AlPO₄ and Araxá apatite in solid medium, and AlPO₄ and Araxá apatite in liquid medium. Soil P-solubilizing fungi (Aspergillus) and P-solubilizing bacteria (Enterobacteriaceae) were tested. In solid medium, all isolates solubilized CaHPO₄, not any isolate solubilized Araxá apatite, and one fungus isolate (PSF 7) solubilized AlPO₄. In liquid medium, all isolates solubilized AlPO₄ and Araxá apatite. Screening of P-solubilizing microorganisms must be done by quantifying their potential of phosphate solubilization in liquid growth medium.