... H2PO4) 2-H2O. Properties: colored particles. Available water-soluble fertilizer, weak acid. Uses: the supply of plant phosphorus, calcium, sulfur and other ... dark gray, gray, loose Web results. Available water-soluble fertilizer, weak acid. Uses: the supply of plant phosphorus, calcium, sulfur and other ... >%44%42%Water soluble P2O5 >%40%37%Free phosphate acid(as P2O5)<%3%3%Moisture(H2O) <%5%5%Particle ...