Magnesium Sulphate Heptahydrate (MgSO₄·7H₂O), commonly known as Epsom Salt, is a highly soluble and essential agricultural input. It supplies Magnesium (Mg), a vital element for chlorophyll production and photosynthesis, and Sulphur (S), important for amino acids and proteins. Being fully water-soluble, it is widely used in fertigation, foliar sprays, and soil applications to prevent and correct magnesium and sulphur deficiencies in crops.