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To help farmers make the best use of limited irrigation water in the arid West, U.S. Department of Agriculture (USDA) researchers are helping farmers determine how much water major crops actually need. Tom Trout, Agricultural Research Service (ARS) Water Management Research Unit (WMRU) research leader, Fort Collins, CO, and his colleagues are measuring crop water-use efficiency not by the traditional measure of crop yield per drop of irrigation water applied, but instead yield per drop of water actually taken in by the crop. ARS is USDA’s c...
