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Common sources of NPK fertilisers

Common sources of NPK fertilisers include ammonia (NH3), diammonium phosphate ((NH4) 2HPO4), ammonium nitrate (NH4NO3), ammonium sulphate ((NH4) 2 SO4), calcium cyanamide (CaCN2), calcium nitrate (Ca(NO3) 2), Sodium Nitrate (NaNO3), Urea (N2H4CO). Phosphorus is commonly provided as a phosphate such as diammonium phosphate ((NH4)2HPO4) or calcium dihydrogen phosphate (Ca(H2PO4)2).

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Common sources of NPK fertilisers

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  1. CommonsourcesofNPKfertilisers CommonsourcesofNPKfertilisersincludeammonia(NH3),diammoniumphosphate ((NH4) 2HPO4), ammonium nitrate (NH4NO3), ammonium sulphate ((NH4) 2 SO4), calcium cyanamide (CaCN2), calcium nitrate (Ca(NO3) 2), Sodium Nitrate (NaNO3), Urea (N2H4CO). Phosphorus is commonly provided as a phosphate such as diammonium phosphate ((NH4)2HPO4) or calcium dihydrogen phosphate (Ca(H2PO4)2). Potassium is formed from potassium sulphate (K2SO4) or potassium chloride (KCl), alsoknownasthepotassiumsalt.Thephosphoruscontentoffertilisersisexpressedas the amount of P2O5, as it is the anhydrous form of phosphoric acid. In this sense, it is the most concentrated form of phosphate and the form of phosphorus that plants require.Potassiumcontentis indicatedintheform ofK2O,alsocalled potash. Potassiumisacomponentoftheresidueleftoverwhenplantmaterialisburned. Sprinklingashonfieldsisanancientmethodfor replenishingpotassium. ModernchemicalfertilisersusuallycontainKClinstead,butthepotassiumcontentisstill given as the equivalent of potash. Potassium chloride is 52% K by weight. Potash is made up of 83% potassium. Therefore, KCl provides only about 2/3 as much potassium as K2O for the same weight. So if the fertiliser contains 25% of the KCl by weight, the potassiumrating based onpotash will beonly 16.

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