Fertilizers and crop yield
Fertilisers contain minerals such as nitrogen, potassium and phosphorus, which help plants to grow. Fertilisers increase crop yields but cause the problem of 'eutrophication' when they're washed by rainwater into rivers and lakes. Most chemical fertilisers are made by the reaction of an acid with an alkali.
Fertilisers make crops grow faster and bigger so that crop yields are increased. They're minerals, which must first dissolve in water so that plants can absorb them through their roots.
Fertilisers provide plants with the essential chemical elements needed for growth particularly nitrogen, phosphorus and potassium. The proportions of these elements in a fertiliser are often shown as N:P:K = 15:30:15.
The name or formula of a compound often suggests which elements are provided by a particular fertiliser.
|Ammonium phosphate||(NH4)3PO4||nitrogen and phosphorus|
|Potassium nitrate||KNO3||potassium and nitrogen|
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