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Mono-Ammonium Phosphate (MAP)

Mono-Ammonium Phosphate (MAP)

Basic Information:

Product Name: Monoammonium Phosphate(MAP)

Chemical Formula: NH4H2PO4

Formula Weight: 115.03 g/mol

Water solubility(20º): 370 g/L

Solution pH (1g/mL): 4 to 5

HS CODE: 3105400000

Place of Origin: China

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Product Description:

Monoammonium phosphate (MAP) is also known as ammonium phosphate monobasic and ammonium dihydrogen phosphate. Its appearance is white crystal or powder and it has the highest phosphorus content of any common solid fertilizer and is excellent sources of phosphorus (P) and nitrogen (N) for high-yield, high quality crop production.


  • It is a water-soluble substance, and it can rapidly dissolve in moist soil.
  • Both ammonium and phosphate ions are important in soil health when dissolving in soil water.
  • MAP fertilizer is acidic, and it makes this fertilizer very useful for alkaline and neutral pH soil types.

Guaranteed Specifications: HG/T 5048-2016


100% Full soluble Grade MAP(12-61-0)


White Crystal



Total Nutrients (N+P2O5)




Total Nitrogen




Soluble P2O5 Content




Water insoluble Matter Content




Moisture (H2O)


Note: The content of Pb, As, Cd, Cr and Hg can be reached according to customer’s requirements

pH(1 g/100 mL)



We effectively solved the problem of the caking of fertilizer by improving the appearance and quality of packages such as the thickness of inner bags, the tightness of bags and loading capacity of outer bags.

All kinds of customized packages can be provided according to customer’s requirements.

  • 25 Kg/50 Kg Laminated woven bags
  • 500Kg/600 Kg/1000 Kg/1200 Kg bulk bags
  • 20 Kg/25 Kg PE Valve bags or PE heated sealed bags
  • 20-27 MT loose or on pallet in containers


The process for manufacturing MAP is relatively simple. In a common method, a one-to-one ratio of ammonia (NH3) and phosphoric acid (H3PO4) is reacted and the resulting slurry of MAP is solidified in a granulator. The second method introduces the two starting materials in a pipe-cross reactor, where the reaction generates heat to evaporate water and solidify MAP. Other methods exist as well. An advantage of manufactured MAP is that lower-quality H3PO4 can be used compared with other P fertilizers often requiring a more pure grade of acid. The phosphorus pentoxide (P2O5) equivalent content of MAP varies from 48 to 61 percent, depending on the amount of impurity in the acid. The most common fertilizer composition is 11-52-0. and high quality fertilizer composition is 12-61-0.


  • Agricultural use

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. The pH of the solution surrounding the granule is moderately acidic, making MAP an especially desirable fertilizer in neutral- and high-pH soils. Agronomic studies show that, under most conditions, no significant difference exists in P nutrition between various commercial P fertilizers under most conditions.

Growers apply granular MAP in concentrated bands beneath the soil surface in proximity of growing roots or in surface bands. It’s also commonly applied by spreading it across the field and mixing it into the surface soil via tillage. In powdered form, it’s an important component of suspension fertilizers. When MAP is made with especially pure H3PO4, it readily dissolves into a clear solution dispersed as a foliar spray or added to irrigation water. The P2O5 equivalent content of high-purity MAP is usually 61 percent.

  • Non-agricultural uses

MAP is used in dry chemical fire extinguishers commonly found in offices, schools and homes. The extinguisher spray disperses finely powdered MAP, which coats the fuel and rapidly smothers the flame.

*Source: Nutrient Source Specifics (No. 9), International Plant Nutrition Institute. 

JS International Industrial Limited, was established in 2006 in Changsha City, Hunan province. Now we have developed an integrated business platform regarding chemical products such as fertilizers, feed additives and rare metal superfine powder materials.

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