Phosphorus Fertilizer: The Original and Commercial Sources ...
Earlier the original source of phosphorus (P) fertilizer was bones; as time passes, the supply of P fertilizer will get exhausted. Today, rock phosphate is the only raw material in the form of P fertilizers. There are two types of rock phosphates: igneous and sedimentary; both have the same phosphate mineral,, calcium phosphate of apatite group. The general formula for pure rock phosphate ...