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Silver-white light metal or element (Mg), which is involved as the eighth most abundant element about 1.4% in the structure of the earth's crust. Due to its reactivity, 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, as in the case of the Dolomites. The human and animal organism can not produce magnesium itself, and therefore needs to be supplied to the body daily in sufficient quantity. 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 greens) and is therefore indispensable for the photosynthesis,

Incidentally, calcium and magnesium have partly the same functions in the plant and can replace each other to some extent. In very potassium-containing soils often magnesium deficiency occurs. In light soils, it can also be easily washed out, which is particularly favored by "acid rain". A shortage can for chlorosis and stem necrosis and thus lead to yield reduction and poor wine quality. A deficit is with fertilization balanced with magnesium sulfate or in pure form with Epsom salt. Very important is a balance between magnesium, potassium and calcium, so this must be taken into account.

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