ChileanJAR

The number of phosphate solubilizing bacteria and fungi in seven volcanic soils was investigated. The results led to conclude that the fungi population is more active, specially in solubilizing organic phosphates. The amounts of P released by the action of four active fungi strains (Penidihium sp., AspergiÍíus níger, Mucor sp. and a possible Botrytis sp.), from five inorganic and organic phosphates and two types of phosphate rocks, were evaluated. The results show that Aspergillus niger and Botrytis sp. are active in releasing phosphorus, particularly from aluminium phytate. The possible mechanims involved in the P-solubilization and their occurrence in volcanic ash derived soils are discussed.