Potassium nitrate (KNO 3), known historically as saltpeter or the mineral niter, is a common salt with multiple uses. It has been known since antiquity; an early appearance in the chemical literature ...

It's most commonly used for growing crops such as potatoes. Other chemical versions of potassium fertilizers include potassium magnesium sulfate and potassium nitrate but these are not used all ...

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There are many useful synthetic fertilisers containing nitrogen, phosphorus and potassium ... Nitric acid is then used to make ammonium nitrate which is high in nitrogen.