THE FERTILIZER INDUSTRY

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Presentation transcript:

THE FERTILIZER INDUSTRY

Nitrogen must be supplied to the soil in order to fertilise the soil and optimise agricultural production of foodstuffs. Fertilisers can be in the form of: RENEWABLE RESOURCES – compost, guano and manure NON-RENEWABLE RESOURCES – commercial fertilisers

Commercial fertilisers are described in terms of their relative proportions of nitrogen (N), phosphorus (P) and potassium (K). NPK numbers are printed on fertiliser bags. eg 5:13:5 means the content of the bag is 5% nitrogen 13% phosphorus 5% potassium

THE PRODUCTION OF NITRIC ACID THE OSTWALD PROCESS:

Sources of phosphorus: bonemeal that was acidified to yield phosphoric acid H3PO4 mined calcium phosphate Ca3(PO4)2 Calcium phosphate is insoluble in water and cannot be absorbed by plants. Calcium phosphate is treated with sulphuric acid to yield water soluble superphosphate, that can be absorbed. Ca3(PO4)2 + H2SO4 → 2CaSO4 + Ca(H2PO4)2

Sources of potassium: Salts containing potassium are referred to as POTASH when used as fertilisers. Mined potassium salts, such as KNO3 and K2SO4 are used.

Extensive utilisation of fertilisers leads to pollution of surface and ground water and eutrophication of lakes, dams and rivers. Algal bloom on Hartbeespoort Dam due to fertiliser runoff from farm lands.