Diammonium phosphate (DAP) is also known as diammonium hydrogen phosphate. It is off-white or dark gray particles, easy to decompose in humid air, volatile ammonia into ammonium dihydrogen phosphate. The aqueous solution is weakly alkaline, pH8.0. Diammonium phosphate is a kind of high concentration of quick-acting fertilizer, suitable for all kinds of crops and soils, especially suitable for crops that like nitrogen and need phosphorus, can be used as base fertilizer or trailing fertilizer, and is suitable for deep application.