TSP (Triple Super Phosphate) - Plant Nutrition, Classic Fertilizers
The formula of triple superphosphate fertilizer, shortly called as TSP, is Ca(H2PO4)2.H2O (43-44% P2O5). When it dissolves in water, its phosphorus is negatively charged (-1). While a part of phosphorus content in TSP can dissolve in water, the rest is in ammonium citrate. However both of them are in plant absorbable forms.