| ertilizer | Chemical composition | K concentration (%) |
|---|---|---|
| Muriate of potash | KCl | 50, 41, 33 |
| Potassium sulfate | K2SO4 | 43 |
| Potassium nitrate | KNO3 | 37 |
| Sulfate potash magnesia | K2SO4 · MgSO4 | 18 |
| Kainite | KCl + NaCl + MgSO4 | 10 |
The usual potassium fertilizers are two main types in which K+ is combined with either chloride (muriate of potash) or sulfate (sulfate of potash).
Potassium chloride (KCl) is available in three different grades: 50% K, 41% K, and 33% K. The two latter forms contain substantial amounts of sodium chloride (NaCl) and are recommended as K+ fertilizers for natrophilic crops.
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