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Columbia
Valley Viticulture Overview
Soils
Soils in the
region influence fruit quality. Generally, they are deep and sand?based,
with varying degrees of gravel, silt and loam. Their low fertility and
quick drainage make them poor for many annual crops, but ideal for grapes.
Weak soils make the vines struggle for water and nutrients, driving the
plant to put its energy into ripening the grape seeds, a sure way to get
delicious fruit.
Rainfall
Washington
grape growers have what few European and even northern California vineyardists
have??almost ultimate control over water application.
Annual
rainfall in Napa, California, averages between 25 to 35 inches; France's
Bordeaux region averages from 20 to 30 inches annually; eastern Washington
averages 6 to 8 inches of precipitation. This eastern half of Washington
lies in the rain shadow of the Cascades and defies the state's reputation:
it's dry, sunny and warm, making it one of America's pre?eminent agricultural
producers.
Research
by Washington State University has shown vine vigor can be controlled
through regulated deficit irrigation at certain growing stages of the
vine. The research has resulted in a dramatic reduction of water use in
Washington vineyards compared to 30 years ago.
Sunlight
The Columbia
Valley is at similar latitude to France's Burgundy and Bordeaux wine regions.
At the 48th parallel, both areas are far enough south of the North Pole
to accumulate heat units and have longer daylight hours than southern
regions. The extra daylight provides for more photosynthesis, and the
ability to ripen fruit. The Columbia Valley totals about 17 ½ hours
of daylight every day at the peak of the summer sun, compared to about
15 ½ hours for vineyards in northern California.
The
solar efficiency in the Columbia Valley is extremely high, with more unrestricted
sunlight occurring than in Bordeaux. Dramatic temperature swings occur
between minimum and maximum temperatures during the short days of fall.
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