Introduction to Polysulphate, the trademark name for Polyhalite

7 September 2015

We are pleased to announce the release of the new Polysulphate leaflet (in English and French), which outlines the essence of the Polysulphate uses and benefits.

Polysulphate is a new 4-in-1 natural fertilizer for improved crop yields, and contains four plant nutrients: sulphur, potassium, magnesium and calcium.

Although Polysulphate was first found almost 200 years ago in Europe, only recently has a large scale deposit been discovered and this is now mined by Cleveland Potash – 1,200m underneath England’s North Sea.

This natural 4-in-1 fertilizer is available to farmers now, and all tests are conclusive – Polysulphate provides the best value for farmers, crop after crop.

What’s in Polysulphate?
Polysulphate is the trademarked name for polyhalite, a naturally occurring mineral with the chemical formula: K2Ca2Mg(SO4)4 • 2H2O. Polyhalite, in the form of Polysulphate contains:

  • 48% SO3 (19.2% S) balances crop’s need for S and improves efficacy of other nutrients (e.g. N and P)
  • 14% K2O (12% K) as potassium sulphate, vital for improved crop health
  • 6% MgO (3.6% Mg) as magnesium sulphate, essential for photosynthesis
  • 17% CaO (12% Ca) as calcium sulphate, crucial for cell division and strong cell walls


Mined in the UK, Cleveland Potash is the first – and only producer – in the world to mine polyhalite, marketed as Polysulphate™.

Where can I find out more about Polysulphate
The Polysulphate website provides plenty of information about the produce, including information on the need for sulphur application, livestock sulphur requirements, fertilizer spreader settings, and information about using Polysulphate on organic farms. In addition there are a number of documents, and promotional leaflets available on the download page of the website.