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Factors determining rock phosphate solubilization by microorganisms isolated from soil

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Abstract

Forty two soil isolates (31 bacteria and 11 fungi) were studied for their ability to solubilize rock phosphate and calcium phosphate in culture medium. Eight bacteria and 8 fungi possessed solubilizing ability. Pseudomonas cepacia and Penicillium purpurogenum showed the highest activity. There was a correlation between final pH value and titratable acidity (r=−0.29 to −0.87) and between titratable acidity and soluble phosphate (r=0.22 to 0.99). Correlation values were functions of insoluble phosphate and of the group of microorganisms considered. A high correlation was observed between final pH and soluble phosphate only for the rock phosphates inoculated with the highest concentration of solubilizing bacteria (r=−0.73 to −0.98).

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Nahas, E. Factors determining rock phosphate solubilization by microorganisms isolated from soil. World Journal of Microbiology & Biotechnology 12, 567–572 (1996). https://doi.org/10.1007/BF00327716

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