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Sulphur (S) is an essential element for all plants and animals and is a key part of proteins. In legumes, S is a vital component of nitrogen fixation by the bacteria found in legume root nodules. The form in which S is taken up by plants from the soil is as the sulphate (SO42-) anion. Soil sulphate levels are routinely assessed in many NZ soil tests. However, the SO42- ion is very soluble and thus…

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