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Bioactivation of Poorly Soluble Phosphate Rocks with a Phosphorus-Solubilizing Fungus

^a Indonesian Biotechnology Research Unit for Estate Crops, Bogor 16151, Indonesia
^b PT Petrokomia Gresik (Persero), Gresik, Indonesia

View larger version (18K): [in a new window]   Fig. 1 The amounts of P released (Pi) into the filtrate of Pikovskaya broth and pH of the medium during 14 d of phosphate-solubilizing fungus (PSF) culturing

View larger version (25K): [in a new window]   Fig. 2 Release of P from Morrocan phosphate rock treated with phosphate-solubilizing fungus biomass at varying dosages after 7 and 14 d of incubation, extracted with 2% citric acid (top) and water (bottom)

View larger version (45K): [in a new window]   Fig. 3 Means of countable colony forming unit (log 10 cfu) on the Morrocan phosphate rock inoculated with various dosages of phosphate-solubilizing fungus (PSF) biomass at 7 and 14 d incubation

View larger version (18K): [in a new window]   Fig. 4 Improvement on P solubility of the Morrocan phosphate rock treated with liquid culture supernatant (LCS) for 2 h at varying concentration. PSF is phosphate-solubilizing fungus