FIELD OF APPLICATION Magnesium sulphate is used in nutrient solutions for both irrigation and foliar fertilization to supply the plant nutrients magnesium and sulphur. WHY SHOULD I USE MAGNESIUM SULPHATE Magnesium sulphate is important for photosynthesis because the chlorophyll molecule contains magnesium. It is also used in enzymes, in protein synthesis and in cell walls. Magnesium competes with the uptake of calcium and should therefore not be supplied in excessive amounts, especially to plant species susceptible to physiogenic diseases caused by calcium deficiency. Examples are pistil rot in tomatoes, leaf scorch in lettuce and spotted wilt in apples. Sulphur is a component of certain amino acids and is therefore essential for the plant's ability to produce protein. Sulphur is also involved, for example, in fat production and in energy transfer reactions in cells.