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Area measure with 10.000 m² (corresponds approximately to a soccer field 120 x 80 m); one square kilometer is 100 hectares. The word hectare is composed of the Greek hectic (o) for "a hundred" and Ar and means 100 Ar, Hectares is used in European viticulture for the indication of vineyards common. The after the wine laws the individual countries by area, area or appellation defined maximum earnings of wine is expressed in hectoliters (100 liters) grape or kilograms of grapes per hectare (hectare yield). The usual in England and in the USA acre equals 0.405 hectares (just under 2.5 acres / ha). One hectare consists of four tomorrow (old area measure). See also the grape variety ranked according to vineyard area under vine, as well as other standard units below space measurements and capacity measures,