AL KHOR FERTILISERS SCIENTIFIC NEWS LETTER

Phosphorus solubilizing Microorganisms

Phosphorous is one of the essential nutrients next to nitrogen required for plant growth. It is required for the activities of food synthesis, flower formation, fruit setting and seed setting. It is also essential for cell production and growth of shoot and root. Whatever the quantity of phosphorous applied to the soil through phosphatic fertilisers only 20 –25 percent is available to plant. The remaining phosphorous got irreversibly adsorbed to Aluminium, Iron, Calcium etc. and not available to plant . This insoluble and unavailable form of phosphorous remains unutilised by plant in the soil. It is the least available plant nutrient in soil solution

There are certain bacteria, fungi and actinomycetes known to secrete certain organic acids viz., succicinic acetic,oxalci keto gluconic ,citric and lactic acids which solubilizes the insoluable organic P like Phytin, Insulin etc. These organisms which solubilizes the P are collectively called as Phosphobacteria.

Several soil bacteria belonging  to the genera Pseudomonas and Bacillus and fungi belonging to the genera Penicillum and Aspergillus have the ability to bring the insoluable form of phosphates into soluable form, which help of organic acids viz ., acetic propionic ,lactic,fumaric, gluconic etc., which are secreted by these organisms. These acids dissolve the bound form of phosphates and hydroxy acids, chelate calcium and iron resulting in effective solubilisation and utilisation of Phosphates.

Mechanism of Al Khor Phos

AL Khor Phos is Phosphorous solubilizing microorganisms solubilize inorganic insoluble phosphorous by either excreting organic acids that directly dissolve phosphatic materials or they chelate cationic partners of the P ion. These bacterial colonies also dissolve the phosphate at the sites of exudation along the rocks by producing organic acids.