produces a quarter of the nation’s food California's Central Valley: Regional Characteristics California’s Central Valley 40% of U.S. fruits, nuts and other table foods irrigated land in California California's Central Valley: Regional Characteristics 40% of U.S. fruits, nuts and other table foods a quarter one quarter 40% of U.S. fruits, nuts and other table foods http://ca.water.usgs.gov 40% of U.S. fruits, nuts and other table foods usgs.gov a quarter