; (B) limited resource beginning farmers, producers, or ranchers (as defined by the Secretary); or (C) socially disadvantaged farmers or ranchers (as such term is defined in section 2501(e) of the Food, Agriculture, Conservation, and Trade Act of 1990 ( 7 U.S.C. 2279(e) )). (3) Historically underserved community The term historically underserved community means a community— (A) comprised of at-risk populations (as defined by the Secretary), such as historically underserved farmers, producers, or ranchers, the economically disadvantaged, racial and ethnic minorities, the uninsured, low-income children, the elderly, the homeless, and individuals with chronic health conditions, including severe mental illness; (B) with a high rate of obesity and obesity-related disease; or (C) with few or no grocery stores or other retail food establishments. (4) Underutilized tract of land The term underutilized tract of land means a tract of land that is not utilized fully (as determined by the Secretary in consultation with the Governor of the State involved and the local governmental entity involved), including a tract of land— (A) that is undeveloped, or where only a percentage of the land is developed; (B) in the case of public land, land with low or decreasing public use; or (C) with unused recreation facilities. (5) Vacant lot The term vacant lot means a tract of land without buildings. (e) Authorization of appropriations There are authorized to be appropriated to carry out this section $50,000,000 for fiscal year 2018 and each fiscal year thereafter. 5. Urban agriculture liaison (a) Authorization The Secretary of Agriculture shall establish in the Department of Agriculture the position of Urban Agricultural Liaison. (b) Duties The Urban Agricultural Liaison shall— (1) establish and administer the urban agriculture outreach program established under section 4; (2) establish and administer an information clearinghouse on urban agriculture