Dear Dr. Rajanna, efficiency of ground rock phosphates applied directly as P fertilizers depends on various factors like (i) their physical and chemical properties; (ii) soil and climate factors; (iii) the cropping system; and (iv) farming management practices. In non-acidic soils, directly applied PRs are not effective. In these cases, treating rock phosphates with organic materials and composting them is a promising technique for enhancing the solubility and the subsequent availability of P to plants. During the decomposition of organic materials, a large number of organic acids like citric, malic, fumaric, succinic, pyruvic, tartaric, oxaloacetic, 2-ketogluconic, lacticoxalic, propionic and butyric acid and humic substances are produced. These acids enhance solubility and release of P from the rock phosphates, thereby improve agronomic efficiency of rock phosphates. Therefore, one should first prepare phospho-compost by treating the rock phosptate with FYM (organic manure) and apply it to the field crops for getting best result.
Yes Rajanna , you can mix FYM with rock phosphate ( if you can compost both , wonderful) for better phosphate solubility from both the sources viz., rock phosphate itself and soil immobilized P fraction .
Prof. Dilip Kumar Kundu has hit the nail on the head with his answer so that should be enough.
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