The organic P fraction present in paddy straw (84% of the total
P) and animal manures (30e40% of total P) can be mineralized by
phytate mineralizing microorganisms that can de-phosphorylate
the organically bound phytate P and release it in the plant available
inorganic (Pi) form. Recovery of organic P present in crop
residue and livestock manure (60e65% feed P is excreted) can
improve the P content of compost. Thus, co-composting of bioaugmented
paddy straw and animal manure mixture may produce
organic fertilizer with high P content. The progressive return
of P-enriched organic fertilizer in soil can partially solve its problem
of low P availability. Most of the studies for developing P-enriched
compost have been confined to supplementation of composting
substrates with rock phosphate and its subsequent inoculation
with phosphate solubilizing microorganisms