1. Department of Plant and Soil Science, University of Vermont, Burlington, Vermont 05405, United States
2. Gund Institute for Environment, University of Vermont, Burlington, Vermont 05405, United States
3. United States Environmental Protection Agency, Region 1, Water Division, Boston, Massachusetts 02109-3912, United States
4. United States Environmental Protection Agency, Office of Research and Development, Research Triangle Park, North Carolina 27711, United States
5. Extension Center for Sustainable Agriculture, University of Vermont, Burlington, Vermont 05405, United States
6. Rubenstein School of Environment and Natural Resources, University of Vermont, Burlington, Vermont 05405, United States