Appearance: It is a compound fertilizer containing nitrogen and phosphorus. Grey white or dark grey granule, specific gravity is 1.619，soluble in water, insoluble ethanol. It have a certain moisture absorption, and easy to decompose in moist air, and volatilization of ammonia into ammonnium dihydrogen phosphate. The aqueous solution is alkalescence, ph value is 8.0. Usage: Diammonium..