Fertiliser Types: Potassium (K)
The largest world reserves of soluble potassium salts are found in Germany and Russia. There are also extensive deposits in Canada, Israel, USA, France, Spain and some in Poland and Britain. The most commonly used types of potassium fertiliser
are the following:
Muriate of Potash (MOP) The chemical name for this is Potassium Chloride, a compound which contains 50% potassium (K). This is the cheapest and most commonly used form of straight potassium.
Sulphate of Potash (SOP) The chemical name for this is Potassium Sulphate, a compound which contains 42% potassium (K). This is more expensive than muriate of potash. It is suitable for all crops grown in any soil and it has a special value for horticultural crops where the quality is so important. When used on potatoes it gives a higher dry matter content and therefore improves quality. Sulphate of potash contains 18% sulphur and is an excellent source of S for crops.