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Concept
Yield (wine)
Summary
In viticulture, the yield is a measure of the amount of grapes or wine that is produced per unit surface of vineyard, and is therefore a type of crop yield. Two different types of yield measures are commonly used, mass of grapes per vineyard surface, or volume of wine per vineyard surface.
The yield is often seen as a quality factor, with lower yields associated with wines with more concentrated flavours, and the maximum allowed yield is therefore regulated for many wine appellations.
In most of Europe, yield is measured in hectoliters per hectare, i.e., by the volume of wine. In most of the New World, yield is measured in tonnes per hectare (or short tons per acre in the USA) – i.e. by mass of grapes produced per unit area.
Due to differing winemaking procedures for different styles of wine, and different properties of different grape varieties, the amount of wine produced from a unit mass of grapes varies. It is therefore not possible to make an exact conversion between these units. Representative figures for the amount of grapes needed for 100 L of wine are 160 kg for white wine, 130 kg for red wine, and 140 kg for a mixture of red and white wine.
Thus:
for white wine, 100 hl/ha ≈ 16,000 kg/ha (16 t/ha) = 6.5 tons per acre.
1 ton per acre = 2470 kg/ha ≈ 15 hl/ha
for red wine, 100 hl/ha ≈ 13,000 kg/ha (13 t/ha) = 5.3 tons per acre.
1 ton per acre = 2470 kg/ha ≈ 19 hl/ha
for mixed wine, 100 hl/ha ≈ 14,000 kg/ha (14 t/ha) = 5.7 tons per acre.
1 ton per acre = 2470 kg/ha ≈ 17.5 hl/ha
Yields vary greatly between countries, regions and individual vineyards, and can be vintage-dependent. Somewhere around 50 hectoliters per hectare, or 3 tons per acre, is a typical representative figure for many countries and regions.
While yield is generally seen as an important quality factor in wine production, views differ on the relative importance of low yields to other aspects of vineyard management. In general, there is consensus that if vines are cropped with a very high amount of grape clusters, a poor wine will result because of slow and insufficient ripening of the grapes, due to an unfavorable leaf to fruit ratio.
Official source
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