An area of 10,000 m² (equivalent to a football pitch 120 x 80 m); one square kilometre (km²) consists of 100 hectares. The word hectare is composed of the Greek hekt(o) for "hundred" and ar and means 100 ares. Hectare is commonly used in European viticulture to indicate the size of vineyards.

The maximum yield per wine-growing area or appellation or even smaller units/wine types, which varies from country to country in the production of quality wines, is defined in hectolitres (hl) of wine or in kilograms (kg) of grapes per hectare (yield per hectare). The number of vines per hectare depends on the chosen planting density, which is heavily dependent on the region, vine training and type of cultivation.
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Roman Horvath MW
Domäne Wachau (Wachau)