Silver-white light metal (Mg), which is the eighth most common element and accounts for about 1.4% of the earth's crust. Due to its responsiveness, it is hardly solid, but mostly in the form of chemical compounds such as carbonates, chlorides, silicates and sulfates. In the form of the carbonate dolomite, it is even mountain-forming, for example in the dolomites. 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 nutrient for plants or Rebstock because it promotes nutrient uptake. It forms the central atom of chlorophyll (leaf green) and is therefore indispensable for them photosynthesis,
Calcium and magnesium have partly the same functions in the plant and can replace each other to a certain extent. Magnesium deficiency often occurs in soils that contain a lot of potassium. In the case of light soils, it can also be easily washed out, which is particularly favored by "acid rain". A lack can lead to chlorosis and stem necrosis and with it too income deducted and lead to poor wine quality. A deficit is with fertilization balanced with magnesium sulfate or in pure form with epsom salt. It’s very important to have a good balance between magnesium, potassium and calcium, so this has to be considered.