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The basic elements required for plant growth are usually regarded as potassium, phosphorus and nitrogen, and most proprietary brands of balanced fertiliser quote the percentage of these contained. Although these are of special importance all plants require, in addition, fairly considerable quantities of sulphur, calcium and magnesium, lesser, but still appreciable, amounts of iron, manganese, sodium, and minute quantities of other chemicals such as boron, zinc and so on, usually referred to as trace elements.