"Phosphorus is an essential macronutrient for plants and is added to soil in the form of phosphatic fertilizers. However, the applied quantity of soluble forms of phosphate fertilizers is easily precipitated into insoluble forms and is not efficiently taken up by the plants. Use of phosphatic fertilizers has become a costly affair, also environmentally undesirable and there is need for alternative sourcesThe ability of microorganisms to solubilize different forms of calcium phosphate has been reported. The solubilization of inorganic phosphates by microorganisms supplies phosphates for plant nutrition and increases their growth. The attractive approach of microbially mediated solubilization of phosphate has been successfully proved in soil conditions which resulted in agriculture production similar or better than achieved with soluble phosphate Phosphate solubilizing microorganisms convert insoluble phosphates into soluble forms through the processes of acidification, by the production of organic acids, production of acid and alkaline phosphatases and to H+ production. These organic acids can either dissolve phosphates as a result of anion exchange or can chelate Ca, Fe or Al ions associated with the phosphates.
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Last date updated on July, 2014