Monoammonium phosphate is often used in the blending of dry agricultural fertilizers. It supplies soil with the elements nitrogen and phosphorus in a form 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 an emerald green amethyst or aquamarine crystal growing box kit for children.

For R&D use onlynot for drug household or other uses.

Ammonium dihydrogen phosphate (ADP) also known as monoammonium phosphate (MAP) NH4H2PO4 is formed when a solution of phosphoric acid is added to ammonia until the solution is distinctly acidic. It crystallizes in tetragonal prisms.