Polyhalite is a naturally occurring evaporite mineral comprising potassium, calcium, sulphur and magnesium. POLY4 is the trademark name of our polyhalite products which deliver these four essential nutrients in granulated or powdered form.
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Sirius Minerals's suite of multi-nutrient products have significant market potential as a bulk source of essential nutrients, a premium chloride free fertilizer and as part of an NPK blend.
Our global programme has proven that POLY4 is a highly effective fertilizer, suitable for widespread commercial use on broad acre and high value crops.