Bluish white, brittle heavy metal or element (Zn). The name derives from prong (tooth, tooth), since zinc solidifies like a gnat. It occurs relatively frequently in the earth's crust, but not in pure form (solid), but only bound in ores. The most important ores for zinc extraction are zinc sulfide ores. Zinc is essential for all living beings and is a component of important enzymes, For a healthy growth of the vine he has great importance. A zinc deficiency occurs mainly in sandy soil. Furthermore are at risk floors with extremely high content phosphorus because increased phosphorus supply to the vine can hinder zinc uptake.
Also calcareous soils or high content tend calcium to zinc deficiency. This leads to disturbances in the blossom and in fruit set, poorly lignified stems and poorly developed exaggerated, The leaves have sharply serrated edges and open stalks with elongated, narrow leaves. Often that goes along with it chlorosis, A treatment is done by brushing pruning wounds with zinc paste or spraying the foliage. The use of galvanized wires and sticks in the vineyard can lead to large excess in the soil. Too much content in the wine leads to cloudiness and metallic - bitter Taste. The Perceptual threshold is 5 mg / l. See also for other metals below Black break,