Unit of measurement or indicator (also quantity of cut wood) for the vigour or yield capacity of the vine. A high wood yield indicates strong vigour, high sustainable yield, possibly too high soil care intensity, as well as too high fertilisation with nitrogen. Low wood yield, on the other hand, indicates weak growth, yield overload, poor leaf/fruit ratio and stress problems, as well as deficiencies in later wine quality, especially in white wines. From the growth of the previous year, the growth of the following year can be inferred. The ideal number of eyes is given when vigour is in good proportion to the reserves of carbohydrates in roots, trunk and branches.
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Markus J. Eser
Weinakademiker und Herausgeber „Der Weinkalender“