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The Use and Abuse of Organic and Inorganic Fertilisers Fertilisers provide nutrients needed by a crop to grow by adding mineral salts to the soil. (1) (6) Organic fertilisers include manure, compost and sewage sludge. Inorganic fertilisers however, are liquids or pellets containing mineral ions and they are made either from naturally occurring rocks or by industrial processes. The main soil nutrients found in these fertilisers are nitrogen, phosphorus and potassium, which are present in concentrated form. Both types of fertiliser are added to increase crop yield but there are differences in their uses as will be shown later. (7) (6) However, all fertilisers must be used with caution as the misuse or overuse of them can lead to serious problems. Eutrophication is the main environmental hazard associated with fertilisers. (1) The three main soil nutrients named above are called macro-nutrients as they are required in large amounts and they all...

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