World Journal of Microbiology and Biotechnology

, Volume 12, Issue 6, pp 567–572 | Cite as

Factors determining rock phosphate solubilization by microorganisms isolated from soil

  • E. Nahas


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).

Key words

Bacteria fungi rock phosphate solubilization 


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Copyright information

© Rapid Science Publishers 1996

Authors and Affiliations

  • E. Nahas
    • 1
  1. 1.Departamento de Microbiologia, Faculdade de Ciências Agrárias e Veterinárias, UNESP (Department of Microbiology, Faculty of Agrarian and Veterinary Sciences, UNESP)Jaboticabal, SPBrasil

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