Illmer

Die Bodenkultur - Journal for Land Management, Food and Environment

P. ILLMER and F. SCHINNER:

Phosphate solubilizing microorganisms under non-sterile conditions

Summary

Two species Penicillium aurantiogriseum and Pseudomonas sp. (PI 18/89) highly able to solubilize inorganic phosphates were tested for their efficiency to dissolve calcium phosphates under non-sterile conditions. In laboratory experiments plant available phosphorus was only increased when phosphate solubilizing microorganisms disposed of sufficient nutrient supply. Field studies indicate that phosphate solubilizing microorganisms were too vulnerable and unreliable to be used in agriculture. Too many biotic and abiotic factors influence outcomes of such experiments in an - up to now - unknown way, making results hardly predictable. Key-words: phosphorus, mobilization, solubilization, microorganisms, phosphate-solubilizing microorganisms.