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NPK
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===About NPK===
: [[NPK]] stands for [[Nitrogen|Nitrogen (N)]], [[Phosphorous (P)]], [[Potassium|Potassium (K)]].
: [[NPK]] is generally made by [[Chemical Reaction|reacting]] [[Ammonia]] with [[Nitric Acid]], [[Chemical Reaction|reacting]] [[Ammonia]] with [[Phosphoric Acid]] and combining them these in a [[mixture]] with [[Potassium Chloride]] which is mined from the ground.
Ammonia + Nitric Acid → Ammonium Nitrate
Ammonia + Phosphoric Acid → Ammonium Phosphate
: <chem>3NH3 + H3PO4 -> (NH4)3PO4</chem>
: [[NPK]] can also include other [[mineral]]s such as [[Calcium Phosphate]] and [[Calcium Sulphate]] as [[plant]]s also need both [[Calcium]] and [[Sulphur]].