Education
- Ph.D. Soil Chemistry (Minor: Organic Chemistry), May 1999, North Carolina State University, Raleigh, NC
- M.A. International Development (Major: Forestry and Natural Resource Management), May 1993, North Carolina State University, Raleigh, NC
- B.A. (Major: Economics), May 1991, Brandeis University, Waltham, MA
Experience
- 12/2001-present: USDA / Agricultural Research Service, Kimberly, ID, Soil Scientist
Conduct research on salt, specific ion, and plant nutrient reactions, interactions and movement through soils and into surface and ground waters in relation to quantity and quality of irrigation water used; soil amendment or fertilizer application; food processing or animal waste utilization and disposal; crop selection and management system.
- 8/2000-12/2001: Delaware Valley College, Doylestown, PA, Assistant Professor, Agronomy and Environmental Science
- 5/1999-12/2001: University of Delaware, Newark, DE, Post Doctoral Research Associate
- 5/1995-5/1999: North Carolina State University, Raleigh, NC, Research Assistant / Teaching Assistant / Supplemental Instructor
Research
Research InterestsPrimary research interests evaluate the movement, cycling, reaction and interaction of specific ions and plant nutrients in arid and semiarid zone soils. Research is focused on phosphorus (P) cycling in manure-soil-water systems using laboratory, greenhouse, and field experiments. Research objectives are: (1) identify the effects of soil amendments, fertilizers, and manure on nutrient dynamics, soil chemical properties, and water quality with the goal of reducing non-point source pollution while improving the value of manure as a fertilizer and fertilizer nutrient use efficiency, (2) identify and develop soil-water-crop-animal management systems to protect water quality and the environment, including alternative feeding strategies, manure nutrient stabilization, and best management practices for reducing loss of nutrients to irrigation return flows. These studies will test alternative animal diets and characterize resultant manures, determine the effects of manure characteristics on nutrient availability in irrigated soils, and use amendments to reduce solubility of phosphorus in manures and in irrigation return flows. Additional research projects examine the impact of animals on rangeland soil nutrient cycling and carbon dynamics through managed grazing plans and the impact of animals on soil nutrient cycling in bed-down areas. In addition, preliminary work has begun on assessing the impact of animal production on air quality through examination of emissions from large scale dairy production sites as well as the impacts of alternative manure application technology on gaseous emissions from manure land application sites.
Publications(For a complete listing of publications authored while at NWISRL, see the NWISRL Publications repository. Leytem, A.B. and D.T. Westermann. 2003. Phosphorus sorption by Pacific Northwest calcareous soils. Soil Sci. In review. Leytem, A.B. and J.T. Sims. 2003. Changes in soil test phosphorus from broiler litter additions. J. Environ. Qual. In review. Leytem, A.B., J.T. Sims, and F.J.Coale. 2003. Development and evaluation of a reliable phosphorus site index for Delaware. J. Soil Water Cons. Accepted. Leytem, A.B., R.L. Mikkelsen, and J.W. Gilliam. 2003. Separation of soil organic phosphorus compounds using reverse phase ion-pair chromatography. Commu. Soil Sci. Plant Anal. 34:?. Vadas, P.A., J.T. Sims, A.B. Leytem, and C.J. Penn. 2002. Modifying FHANTM 2.0 to estimate phosphorus concentrations in runoff from Mid-Atlantic Coastal Plain soils. Soil Sci. Soc. Am. J. 66(6) 1974-1980. Leytem, A.B., R.L. Mikkelsen, and J.W. Gilliam. 2002. Adsorption of organic phosphorus compounds in Atlantic Coastal Plain soils. Soil Sci. 167(10) 652-658. Sims, J.T., R.O. Maguire, A.B. Leytem, K.L. Gartley, and M.C. Pautler. 2002. Evaluation of Mehlich 3 as an agri-environmental soil phosphorus test for the Mid-Atlantic United States. Soil Sci. Soc. Am. J. 66(6) 2016-2032. F.J. Coale, J.T.Sims, and A.B. Leytem. 2002. Accelerated deployment of an agricultural nutrient management tool: The Maryland phosphorus site index. J. Environ. Qual. 31:1471-1476. J.T. Sims and A.B. Leytem. 2000. The Phosphorus Site Index: A Phosphorus Management Strategy for Delaware’s Agricultural Soils (ST-05). University of Delaware Fact Sheet. J.T. Sims and A.B. Leytem. 2000. Interpreting Soil Phosphorus Tests (NM-04) University of Delaware Fact Sheet. Leytem, A.B. J.T. Sims, and F. Coale. 1999. The Phosphorus Site Index: A Tool Designed to Asses Potential Phosphorus Risk from Agricultural Sites on the Delmarva Peninsula. Training Manual for Phosphorus Site Index Workshop, November 1999. University of Delaware. Leytem, A.B. and J.T. Sims. 1999. Nutrient Management for Delaware Agriculture: Developing a Comprehensive Nutrient Management Plan. University of Delaware Nutrient Management Fact Sheet 02. University of Delaware. Spencer, J.D. , G.L. Allee, A.B. Leytem, R.L. Mikkelsen, T.E. Sauber, D.S. Ertle, and V. Raboy. 1998. Phosphorus Availability and Nutritional Value of a Genetically Modified Low Phytate Corn for Pigs. In the Proceedings of the International Conference on Odor and Waste Management.
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