Commissioning TEMA Fluid Bed Dryer/Cooler for MAP (Mono-Ammonium Phosphate). Mono ammonium phosphate or MAP is used as a complex fertilizer, containing nitrogen and phosphate. MAP has been an important granular fertilizer for many years. It’s water-soluble and dissolves rapidly in adequately moist soil. Upon dissolution, the two basic components of the fertilizer separate again to release ammonium (NH4+) and phosphate (H2PO4-), both of which plants rely on for healthy, sustained growth.