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Lēf Farms President and CEO Henry Huntington leads U.S. Department of Agriculture (USDA) Secretary Sonny Perdue on a tour the precision controlled hydroponic system and shows how the gutters are are filled with an exact amount of growing medium and seeds. in Loudon, NH, on Sept. 1, 2017. Also in the tour is New Hampshire Agriculture Commissioner Lorraine Stuart Merrill. USDA Photo by Lance Cheung.