Bulk Agricultural DAP Diammonium Phosphate Fertilizer for Improving Soil Phosphorus and Nitrogen Levels Product Description: Diammonium hydrogen phosphate, also known as diammonium phosphate and commonly abbreviated as DAP, appears as colorless transparent monoclinic crystals or a white powder. It has a relative density of 1.619 and a melting point of 190. It is readily soluble in water, and its aqueous solution is alkaline, with a 1% aqueous solution having a pH of 8.0 and