Monoammonium Phosphate (MAP)
N=12% P2O5=52%

Ammonium dihydrogen phosphate, or monoammonium phosphate, NH₄H₂PO₄, is formed when a solution of phosphoric acid is added to ammonia until the solution is distinctly acidic. It crystallizes in quadratic prisms. Monoammonium phosphate is often used in the blending of dry agricultural fertilizers. It supplies soil with the elements nitrogen and phosphorus in a form which is usable by plants. The compound is also a component of the ABC powder in some dry chemical fire extinguishers. This substance is also supplied in a jade green or aquamarine crystal growing box kit for kids.