High-grade rock phosphate (P2O5>30%) is essential for manufacturing P fertilizers. only 39% is of high grade which could meet hardly 35-40% of the demand of P fertilizers (Indian Bureau of Mines 2014). In India, there is a predominance of low grade rock phosphate reserves and out of 260 million ton only million ton is of high grade quality. The consumption of apatite and rock phosphate in 2011-12 was about million tonne. Rock phosphate is usually inert in alkaline and calcareous soils. | Solubilization of rock phosphate by spent wash solubilization of phosphorus from low-grade udaipur rajasthan rock phosphate using spent wash from Faizabad Utter Pradesh India
