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个人简介
Dr. Powell utilizes soil, crop, dairy and social sciences in an agro-ecological approach to 1) determine the effects of dairy diets on soluble nutrient forms (e.g., urine N, water-soluble P) in manure, nutrient (N and P) use efficiencies and the environmental performance of dairy farms; 2) develop a) herd and manure management practices that improve manure collection, distribution and recycling in soils/crops-pasture on dairy farms; b) improved determinations of manure N availability to crops/pasture; and c) manure land application techniques that minimize nutrient loss via ammonia volatilization, greenhouse gas (GHG) emissions, and nitrate leaching and runoff; 3) evaluate and develop ammonia and GHG emission abatement strategies for barns, outside cattle-holding areas (e.g., barnyards, feed bunk areas), and other dairy farm components; and 4) develop tools for farmers and farm advisors to measure, monitor and evaluate nutrient use efficiency in dairy production components, and to improve overall nutrient use, nutrient balances and environmental impacts of dairy production.
Dr. Powell is internationally recognized as an authority on nutrient cycling and environmental impacts of mixed crop-livestock systems in temperate, sub-tropical and tropical environments. He is called upon by the United Nations Food and Agricultural Organization (FAO), the World Bank, the U.S. Agency for International Development (USAID), USDA-Foreign Agriculture Service (FAS), and non-governmental organizations (NGOs) for his expertise in nutrient cycles of mixed crop-livestock farming systems in Africa, Asia, Europe, Australia and the USA. He has been invited to lead research program reviews in Australia, for the World Bank, USAID, and the International Livestock Research Institute (ILRI). He was elected to represent Global Agronomy on the Board of Directors for the American Society of Agronomy (2009-2011), was Chair of the Technical Advisory Panel for USAID’s Global Livestock Collaborative Research Support Program (2009-2011), Chair of Wisconsin’s Air Emissions Task Force: Dairy (2010-2011), and Member of Agriculture Working Group, USDA Office of the Chief Economist, Climate Change Program (2011-2013). He was invited as a Distinguished Expert to spend a sabbatical leave at FAO Headquarters, Rome, Italy (2011-2012)
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Claire A. Romanko,Justin D. Gay,J. Mark Powell,Michel Wattiaux,Carol Barford,Rebecca A. Larson,Matthew D. Ruark
JOURNAL OF ENVIRONMENTAL QUALITYno. 1 (2024): 12-22
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