Abstract
Solubilization of rock phosphate by Aspergillus niger was studied in solid-state fermentation on sugar-beet waste. This combination was selected after testing three agroindustrial waste materials, namely rice hulls, sugar-beet waste and alperujo. Sugar-beet waste was the best substrate for fungal growth with 69% mineralization, followed by rice hulls and alperujo. The fungus was successfully cultivated on sugar-beet waste supplemented with 3.0 g/l rock phosphate, acidifying the medium and thus decreasing the pH to 3–3.5. Solubilization of insoluble phosphate increased during the first half of the process, reaching a maximum of 292 μg phosphate/ml, although a part of it was probably consumed by the mycelium.
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Vassilev, N., Baca, M.T., Vassileva, M. et al. Rock phosphate solubilization by Aspergillus niger grown on sugar-beet waste medium. Appl Microbiol Biotechnol 44, 546–549 (1995). https://doi.org/10.1007/BF00169958
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DOI: https://doi.org/10.1007/BF00169958