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In this work, the filamentous fungus Aspergillus niger was tested for its compatibility with different media compositions, other plant growth promoting microorganisms, and plant growth stimulators. As a first step, a medium selection was carried out employing as a criterion the P-solubilizing activity of A. niger. The highest soluble P concentration of 136,92 mg/L and 394,93 mg/L was registered on Potato-Dextrose and Czapek-Dox medium in conditions of submerged and solid-state fermentation processes, respectively....