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A traditional plant nutrient and soil acidifier. Sulphur is an important secondary nutrient for all plants and is a vital component of many amino acids, and is therefore essential for efficient protein production.

Since the introduction of stricter air pollution controls, sulphur deposition from the atmosphere has greatly decreased and many soils in the UK are now sulphur deficient.

Sulphur deficiency shows as a yellowing between the veins and around the margins of the youngest leaves and can increase a plant's susceptibility to a range of diseases like powdery mildew and blackspot on roses.