Triple Super Phosphate - 45% Water-soluble P2o5, 15% Calcium Nutrient | Rapid Plant Uptake, High Analysis Phosphorus Fertilizer

These Triple Super Phosphate (TSP) is one of the first high analysis P fertilizers that became widely used in the 20th century. Technically, it is known as calcium dihydrogen phosphate and as monocalcium phosphate, [Ca(H2PO4)2.H2O]. It is an excellent P source, but its use has declined as other P fertilizers have become more popular.
The concept of TSP production is relatively simple. Non-granular TSP is commonly produced by reacting finely ground phosphate rock with liquid phosphoric acid in a cone-type mixer. Granular TSP is made similarly, but the resulting slurry is sprayed as a coating onto small particles to build granules of the desired size. The product from both production methods is allowed to cure for several weeks as the chemical reactions are slowly completed. The chemistry and process of the reaction will vary somewhat depending on the properties of the phosphate rock.
Chemical Properties
Chemical formula: Ca(H2PO4)2a cH2OFertilizer analysis: 45% P2O5 (0-45-0)15% Ca
Water-soluble P: Generally >90%Solution pH 1 to 3
TSP has several agronomic advantages that made it such a popular P source for many years. It has the highest P content of dry fertilizers that do not contain N. Over 90% of the total P in TSP is water soluble, so it becomes rapidly available for plant uptake. As soil moisture dissolves the granule, the concentrated soil solution becomes acidic. TSP also contains 15% calcium (Ca), providing an additional plant nutrient.