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Jonathan J Halvorson    Research Soil Scientist Dr. Jonathan J. Halvorson, Research Soil Scientist, recently joined the staff of the Northern Great Plains Research Laboratory.  Previously, he was stationed at the USDA-ARS Appalachian Farming Systems Research Center in Beaver, West Virginia.   His research there centered on the impact of plant-derived chemicals on soil function, especially the use of tannins to manage soil organic matter and nutrient cycling.  He is a recognized authority on spatial statistics and legume effects on soil organic matter accumulation in highly disturbed early successional sites.  He recently participated in studies of temperate bamboo for forage and biofuel.  Halvorson holds bachelor's degrees in Soil & Water Science and Horticulture from the University of Arizona, a M.S. in Environmental Science and a Ph.D. in Botany, both from Washington State University. Soil provides the foundation for productive crop and forage systems that support livestock.
Tannins can affect important biological, chemical, and physical processes that link plant productivity, ruminant physiology, and soil quality. **Scientific Posters**  **Halvorson, J. J., J. A. Harrah, J. M. Gonzalez, and A. E. Hagerman**. 2009. Extraction of phenolic compounds from soils. ASA-CSSA-SSSA International Annual Meetings, Pittsburgh, PA, Nov 1-5, 2009. (3.54 MB)  **Kreinberg, A. J., A. E. Hagerman, J. J. Halvorson, and J. M. Gonzalez**. 2009. Biodegradation of Polyphenolics (tannins) in Natural Soils. 94th Ecological Society of America Annual Meeting. Albuquerque, NM, Aug. 2-7. (Funded in part through an AFSRC SCA with Dr. Ann Hagerman, Miami University (58-1932-6-634) "Effects of Polyphenolic Substances on Soil Organic Matter.") (784 KB) **Halvorson, J. J., J. M. Gonzalez, and A. E. Hagerman**. 2009. Effects of Tannins on Soil Carbon, Cation Exchange Capacity, and Metal Solubility. 94th Ecological Society of America Annual Meeting. Albuquerque, NM, Aug. 2-7. (199 KB) **Belesky, D. P., J. J. Halvorson, and J. M. Ruckle**. 2009. Carbon Isotope Discrimination in Tall Fescue-Endophyte Associations as a Function of Defoliation Intensity and Light Availability. 94th Ecological Society of America Annual Meeting. Albuquerque, NM, Aug. 2-7. (804 KB) **Halvorson, J. J., J. M. Gonzalez, and T. B. Kinraide**. 2008. Tannins Alter Soil Organic Matter Extraction, Solubility of Metals, and Root Physiology. North American Forest Soils Conference. Blacksburg, VA, June 22-26. (1.13 MB) **Halvorson, J.J., Cassida, K.A., Turner, K.E.** 2004. Nutritive quality of bamboo browse for livestock. Proceedings of the American Forage and Grassland Council Conference. 13:417. (974 KB)


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