Patentkali (K2SO4.MgSO4) is een kunstmeststof die bestaat uit kaliumsulfaat en magnesiumsulfaat en bevat:
![Thumb](http://upload.wikimedia.org/wikipedia/commons/thumb/f/f1/Patentkali_%28Potassium_sulfate_with_magnesium%29.jpg/640px-Patentkali_%28Potassium_sulfate_with_magnesium%29.jpg)
30% K2O + 10% MgO + 42% SO3(17% S)
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