Polyhalite is an evaporite mineral comprising hydrated sulphates of potassium, calcium and magnesium, with the chemical formula K2Ca2Mg(SO4)4·2(H2O). Plant nutrients are presented as sulphates. Polyhalite in this presentation is a low carbon footprint high nutrient content fertiliser.

Poly 4 is a granular presentation of micronized Polyhalite suitable for common agricultural fertiliser spreaders.

·         Product solubility

·         Nutrient release rates have been characterised

·         Macro nutrient and trace nutrient content has been defined

·         Poly 4 spread pattern has been independently tested

·         Salt index  defined

·         Neutral pH