Augmentation of the phosphorus fertilizer value of biochar by inoculation of wheat with selected Penicillium strains

摘要: Abstract Due to uncertainty about the accessibility, amount and quality of remaining phosphate rock stocks, a replacement mineral phosphorus (P) fertilizers by sustainable alternatives is desirable. One possibility use P rich biochar derived from pyrolysis organic wastes such as sewage sludge; however, plant availability usually reduced in thermally treated products. This study aimed increase biochar-P means phosphate-solubilizing microorganisms (PSM). The solubilization profiles four Penicillium strains for calcium, iron aluminum were determined liquid cultures containing each respective source. pH, soluble anion (OA) production measured culture filtrate at end incubation. Subsequently, two efficient selected investigate if observed vitro could benefit wheat growth pot experiments. differed their ability solubilize sources OA pattern. Addition individual major OAs Penicillium- free suspensions showed that especially citrate was closely associated with biochar-P. Under semi-sterile soil conditions, inoculated P. aculeatum established well this fungus significantly increased both shoot biomass content biochar-amended treatments. These results open up new approaches using P-solubilizing fungi fertilizer value P-rich biochar.