Aspergillus niger Enhances the Efficiency of Sewage Sludge Biochar as a Sustainable Phosphorus Source

Phosphorus-rich biochar derived from sewage sludge (SS) could be a sustainable alternative P source for agriculture. However, most of is not readily available to plants. We evaluated the potential release SS into soil solution by Aspergillus niger. Additionally, we assessed effect on solubilization phosphate minerals fungus. An incubation study was performed 7 days in shaken flasks containing culture medium supplemented, or not, with P-fixing soil. Biochar showed dual role A. niger: (i) improved AlPO4 and rock phosphate; (ii) acted as source. niger solubilized up 50% contained biochar. A combined application increased availability 500 times These results suggest that P-use efficiency niger, allowing use lower doses this amendment. findings contribute better understanding phosphate-solubilizing microorganisms interaction between Furthermore, underpin fertilizer value Finally, our present win–win environmental benefit it reduces accumulation improves efficiency.