Silver-white, very brittle heavy metal or element (Mn). In nature, it is often associated with iron in many minerals. These are brownstone, brownstone, hausmannite and manganite as well as iron ores. For the Rebstock is manganese as nutrient important in small quantities. It is involved in the carbohydrate and protein metabolism, as well as in the formation of cell membranes and also supports the photosynthesis, Between manganese and iron close interactions are suspected in the metabolism of plants. On alkaline Floors with high PH value is most likely to be associated with a lack of plant-available manganese. Likewise also inhibit high contents calcium reception and transport in the plant.
Particularly calcareous, black or humus sandy soils are prone to manganese deficiency, which leads to the reduction of green and yellow leaf pigments. This manifests itself by small pale to yellow-green, pot-shaped chlorosis, Sufficient manganese is present especially in clayey soils. On moist soils or with prolonged irrigation mostly higher available contents result. Manganese deficiency is more common in dry years than in wet years. An enrichment occurs z. For example, with the manganese-containing fertilizers cottage lime and Thomas flour. An excess of manganese is mainly produced on acidic soils with low pH and has a negative impact on growth and yield limiting.