In 2007, 56.6 million farmland acres were irrigated across the United States. About 16.6 percent of U.S. harvested cropland acres were irrigated, while only 1.2 percent of pastureland acres were irrigated. Nearly three-quarters of U.S. irrigated agriculture occurred in the 17 contiguous Western States, including 73 percent of harvested irrigated cropland and 94 percent of irrigated pastureland.
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