Editing Fertilizer (section)

===Potassium fertilizers===
[[Potash]] is a mixture of potassium minerals used to make potassium (chemical symbol: K) fertilizers. Potash is soluble in water, so the main effort in producing this nutrient from the ore involves some purification steps, e.g., to remove [[sodium chloride]] (NaCl) (common [[salt]]).<ref>{{Cite web |title=Potassium chloride (PIM 430) |url=https://www.inchem.org/documents/pims/pharm/potasscl.htm |access-date=2025-02-09 |website=www.inchem.org}}</ref> Sometimes potash is referred to as K<sub>2</sub>O, as a matter of convenience to those describing the potassium content. In fact, potash fertilizers are usually [[potassium chloride]], [[potassium sulfate]], [[potassium carbonate]], or [[potassium nitrate]].<ref name="FertEncyl">Vasant Gowariker, V. N. Krishnamurthy, Sudha Gowariker, Manik Dhanorkar, Kalyani Paranjape "The Fertilizer Encyclopedia" 2009, John Wiley & Sons. {{ISBN|978-0-470-41034-9}}. Online {{ISBN|978-0-470-43177-1}}.  {{doi|10.1002/9780470431771}}</ref>