Monopotassium phosphate

CAS No.

7778-77-0

Synonyms

MKP; Potassium dihydrogen phosphate; Potassium phosphate monobasic

Molecular formula

KH2PO4

Molecular weight

136.09 g/mol

Grade

Agricultural grade

Packaging

Sealed PE bag / PP woven bag with PE liner
SKU FM-279 Category

Chemical Product Description & Applications

Monopotassium phosphate is a water-soluble fertilizer supplying phosphorus and potassium without nitrogen. Phosphorus supports energy transfer and root development, while potassium contributes to water regulation, enzyme activity and movement of assimilates. Its concentrated nutrient composition allows these two elements to be adjusted independently of the crop’s nitrogen supply.

The selected crystalline product is the common 0-52-34 fertigation grade, with nutrient figures expressed as P2O5 and K2O equivalents. It dissolves to deliver phosphate and potassium ions and forms an acidic solution. In concentrated fertilizer stocks, compatibility with calcium-containing materials is important because insoluble phosphate can form. The product is a straight nutrient source rather than a complete crop-feeding formula.

Typical Applications

  • Fertigation and drip-irrigation feeds: Used to supply phosphorus and potassium through appropriate irrigation-nutrition systems, including stages requiring additional P and K without extra nitrogen.
  • Hydroponic nutrient solutions: Used as a defined phosphate and potassium source when assembling a balanced multi-nutrient solution.
  • Foliar fertilizer manufacture: Used in compatible soluble nutrient blends formulated for crop-specific foliar phosphorus and potassium supply.

Specifications

Parameter Specification Test Method
Appearance White to off-white powder, crystals or granules Visual inspection
Identification Expected cation and anion confirmed Specific-ion reactions with ICP-OES or ion chromatography
Assay ≥99.0% w/w Acid-base titration with phosphate identity
P2O5 equivalent ≥51.5% w/w Total phosphorus determination
Iron ≤0.02% w/w ICP-OES after digestion
Lead ≤20 mg/kg ICP-MS after digestion

Specifications describe the standard grade. Tolerance, test method and documentation package are confirmed per order.

Documents & Handling

Packaging

Sealed PE bag / PP woven bag with PE liner

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CoA

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TDS

Technical Data Sheet

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SDS

Safety Data Sheet

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