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Like phosphate fertilizers, potash fertilizers are mainly derived from geological deposits. The low-grade, unrefined salts obtained from mining could be applied direct, but are normally refined to achieve a more concentrated product.
The most commonly used product is potassium chloride, otherwise known as muriate of potash (MOP), which contains 40% to 60% K2O. For plants which are particularly sensitive to chlorine, for example tobacco, potatoes, fruits and vegetables, potassium sulphate, which contains 50% K2O and 18% sulphur, is available.
For use on Mg-deficient soils, potassium magnesium sulphate, containing 30% K2O, 10% magnesium oxide (MgO) and 18% sulphur (S), is available. These fertilizers supply potassium that is one of the macronutrients for the plants.
Examples of potassium fertilizers are
Complex and compound fertilizers account for 83% of all phosphorus, 67% of all potassium and 25% of all nitrogen consumed in the EU. They are normally classified according to the ratio of their nutrient content, in the order N, P2O5 or P and K2O or K.
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