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Potassium ores are originated from marine sources and are extracted either by underground mining, solution mining or evaporation of brines from water bodies. The K2O content of derived potassium products ranges from 14 to 61% K2O.

MOP (Potash)
MOP is the main Potassium product and the predominant source of K2O in fertilizers. MOP is also used to produce NPK fertilizer as a source of potassium and as a raw material in industrial uses. MOP has a 60-61% K2O content.

Sulphate of Potassium, in addition of potassium, SOP contains sulphur and is chloride-free. SOP can be used as an ingredient of NPK compound and has a 50-51% K2O content.

Sulphate of potassium and magnesium is mined only in a few places in the world and provides, in addition to potassium, some sulphur and magnesium nutrients. MgSOP can be used as a straight fertilizer or as an ingredient of NPK compound; MgSOP has a 22% K2O content.
Also included in this category: is polyhalite, which is a low-grade potassium ore mined in a few places and which provides a source of calcium in addition to K2O, Mg, S. Polyhalite has a 14 % K2O content. 2O content.

Nitrate of Potassium NOP
Nitrate of Potassium (NOP) is obtained by reacting potassium chloride with either nitric acid, ammonium nitrate or sodium nitrate. NOP can be used as an ingredient of NPK compound and also in various industrial segments. NOP has a 45-46% K2O content.