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Silver-white light metal (Mg), which is the eighth most abundant element contributing approximately 1.4% to 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 dolomite carbonate, it is even mountainous, 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,

Calcium and magnesium have similar functions in the plant and can replace each other to a certain extent. Magnesium deficiency often occurs in very potassium-rich soils. 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 with it too income deducted 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 has to be taken into account.

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