This episode details the key ingredients in fertilisers: nitrogen, phosphorus, and potassium. 

It outlines the chemical production of nitrogen-based fertilisers, specifically ammonium nitrate, highlighting its rich nitrogen content due to its dual sources. 

We explain that phosphate rock, obtained through mining, serves as the origin for phosphorus compounds in fertilisers, describing various acid treatments to create soluble forms. 

Finally, we identify potassium chloride and potassium sulfate as the primary mined sources of soluble potassium used directly in fertilisers.

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