Silver-white light metal (Mg), the eighth most common element, accounts for about 1.4% of the structure of the earth's crust. Due to its reactivity, it is hardly found in solid form, but mostly in the form of chemical compounds such as carbonates, chlorides, silicates and sulphates. In the form of the carbonate dolomite, it even forms mountains, as in the Dolomites, for example. The human and animal organism cannot produce magnesium itself and must therefore be supplied to the body in sufficient quantities every day. Magnesium is also one of the most important nutrients for plants and vines because it promotes the absorption of nutrients. It forms the central atom of chlorophyll (chlorophyll) and is therefore essential for photosynthesis.
Calcium and magnesium have partly the same functions in plants and can replace each other to a certain extent. Soils with a high potassium content are often deficient in magnesium. In light soils it can also be easily washed out, which is particularly favoured by "acid rain". A deficiency can lead to chlorosis and stalk paralysis and thus to reduced yields and poor wine quality. A deficit is compensated with fertilisation using magnesium sulphate or in pure form with Epsom salt. It is very important to maintain a balanced ratio of magnesium, potassium and calcium, so this must be taken into account.