The Effect of Aspergillus Isolates on Hydrolysis of Soil Organic Phosphorus (Phytic Acid and Sodium Glycerophosphate)

Organic phosphorus is the dominant part of soil phosphorus. Phytic acid and sodium Glycerophosphate are two different forms of soil organic phosphorus. Soil fungi play an important role in the conversion of these compounds into inorganic forms. Among the fungi، Aspergillus is one of the most effective organisms in hydrolysis of organic compounds. In order to study the ability of Aspergillus fungi on the hydrolysis of Phytic acid and sodium Glycerophosphate، an experiment was conducted as a completely randomized design with factorial arrangement and three replications. The first experimental factor include five fungi isolates (four Aspergillus isolates، Trichoderma harzianum and control) and the second factor include two different organic phosphorus compounds (Phytic acid and Sodium Glycerophosphate). All isolated were grown in PDB at 28 oC and rate of hydrolysis of inorganic phosphorus was determined after 14 days inoculation. In addition، acid and alkaline phosphatase activity and medium pH were measured. The results showed that Aspergillus isolates and Trichoderma harzianum mineralized organic phosphorus significantly (p)