Polyhalite is an evaporite mineral comprising a natural combination of four of the six macro-nutrients that are essential to plant growth – potassium (14% K2O), sulphur (19% S), magnesium (6% MgO) and calcium (17% CaO) – with the chemical formula K2SO4.MgSO4.2CaSO4.2H2O. While polyhalite deposits are known to occur elsewhere, we believe that none have the mineral quality or material extent of our defined North Yorkshire resource, which we believe is the world's largest high-grade known polyhalite deposit.
POLY4 is the trademark name of our polyhalite products. It delivers four essential macro-nutrients and many vital micro-nutrients, in one simple and efficient fertilizer product. Our high quality product is available in granulated, powdered or chipped form to meet the needs of our customers, taking into account their crop needs, blending requirements, application method and soil conditions.