Physicochemical and microbial analysis of pond water a sundarakkottai

Abstract :

Phosphorous has a high importance in the growth of plants and in the biology of soil. Phosphorous is available in soluble and insoluble form. Actinomycetes are one of the most important microbial groups in soil with the ability to solubilise insoluble organic and inorganic phosphates in soil. They are abundant in alkaline areas especially in dry areas and can solubilise insoluble phosphate making it available for plants. Thus crop yield can be increased a lot. Effect of different sources such as carbon, nitrogen and potash on phosphate solubilisation by actinomycetes isolated from rhizosphere soil was studied. The present study revealed that among the carbon sources offered, incorporation of glucose followed by lactose increased solubilisation of phosphate and enhanced acid production. The Actinomycetes preferred ammonium sulphate to solubilise phosphorous than the other nitrogen sources offered. Among the three potassium sources offered all the strains preferred potassium chloride followed by potassium nitrate and released maximum phosphate. Quantitative analysis of organic acids produced by phosphate solubilizing Actinomycetes revealed that they produced acetic acid, succinic acid, and lactic acid which is vital for phosphate solubilisation. Thus the Actinomycetes capable of dissolving phosphates can be isolated from native soil and can be well exploited as Phosphatic Biofertilisers.