MOP – Muriate of Potash


N% P% K% S% Zn%
Typical Analysis 0 0 50 0 0


Chemical Name Potassium chloride or Muriate of Potash (pink or white)
Crop Segments All
Features Most economic form of soluble potassium.
Quality & Handling Nominal 2-4 mm particle sizing, pink in colour.
Bulk density 1.05 tonnes per cubic metre.
Blending Blends with most other products.


  • Potassium stimulates the growth of strong stems and gives the plant some disease resistance by promoting thickness of the outer cell walls.
  • Adequate potassium can reduce moisture loss from growing plants, thereby giving some drought resistance.
  • Potassium improves colour, flavour and storing quality of fruit and vegetables.
  • MOP is the most concentrated form of granular potassium and typically the most cost effective.
  • The even granule size of MOP allows for accurate spreading.
  • MOP is commonly blended with SSP to supply major nutrients for pasture based systems.
  • Two types of MOP: pink and white:
    • Pink MOP can be standard and granular:
      • Pink Standard MOP is used for production of compound NPK fertilisers and as a direct-application fertiliser.
      • Pink Granular MOP is used as a direct-application fertiliser and as a component of blended fertilisers.
    • White MOP is a high-purity product and used as a component of compound NPK fertilisers, as water-soluble fertiliser, for production of potassium sulphate (SOP), potassium nitrate (NOP), potassium hydroxide (KOH), and for other industrial purposes.


Occurs as a natural salt and after processing to cleanse out unwanted salts (especially common salt), it is usually compacted into ‘chips’ and screened to meet size specifications.


MOP is used extensively for fertilising pastures, sugar cane, fruit trees, vegetables, and other field crops.


MOP stores well in bulk or in bags. It is not hygroscopic. MOP is particularly corrosive and so metal parts should be protected. After use, wash out equipment. 


  • MOP should not be used on salt sensitive crops, where soil salt levels are high or increasing, or where irrigation water has high salt levels.
  • Do not place MOP near seed unless the seed has been protected by lime-coating or inoculation.
  • Do not store in silos.

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