UAF University of Agriculture and Forestry (Vietnam)
UAS 1) University of Agricultural Sciences (India)
2) Urea-ammonium sulfate
UC 1) University of California
2) University of Cantho (Vietnam)
UES Urea-elemental sulfur
UG Unfilled grain
UH University of Hawaii (USA)
UICN Union Internationale pour la Conservation de la Nature et des Resources (International Union for Conservation of Nature and Natural Resources)
UKMO United Kingdom Meteorological Office
UMMB Urea-molasses minimal block
UNACASTD United Nations Advisory Committee on the Application of Science and Technology to Development
UNCED United Nations Conference on Environment and Development
UNCRD United Nations Centre for Regional Development (Japan)
UNDCP United Nations Drug Central Program
UNDP/WB United Nations Development Programme/World Bank
UNEP-GRID United Nations Environment Programme-Global Resources Information Database (Kenya)
UNESCO United Nations Educational, Scientific, and Cultural Organization (France)
UNFSSTD United Nations Financing System in Science and Technology Development
UNICEF United Nations International Children's Emergency Fund
UNIDO United Nations Industrial Development Organization (Austria)
UNITAR United Nations Institute for Training and Research (New York, USA)
UNRISD United Nations Research Institute for Social Development
UNU United Nations University
UNVDA Upper Nun Valley Development Authority (Cameroon)
UP Uttar Pradesh (India)
UPGMA Unweighted pair group method, arithmetic mean
UPLB University of the Philippines Los Ba¤os
UPM Universiti Pertanian Malaysia (Malaysia)
UPRHS Upper Pampanga River Integrated Irrigation System (Philippines)
URARTIP Unified Rice Applied Research, Training, and Information Program
UREAP Ratio of urea-N price to rough rice price
URICC Upland Rice Research Intercenter Coordinating Committee
URRC Ubon Rice Research Center (Thailand)
URYN-E International Upland Rice Yield Nursery--Early
URYT Upland Rice Yield Trial
USAID United States Agency for International Development (also AID)
USDA United States Department of Agriculture
USEPA United States Environmental Protection Agency
USG Urea supergranule
UTRIS Upper Talavera Irrigation System (Philippines)
UV Ultraviolet light
UV-B Ultraviolet-B