1. Horticulture Section School of Integrative Plant Science New York State Agricultural Experiment Station Cornell University Geneva NY 14456 USA
2. Department of Forest and Natural Resources Management State University of New York College of Environmental Science and Forestry Syracuse NY 13210 USA
3. Forest Biomass Innovation Center Michigan State University Escanaba MI49829 USA
4. Soil and Crop Sciences Section School of Integrative Plant Science Cornell University Ithaca NY 14853 USA
5. Department of Soil Science University of Saskatchewan Saskatoon SK S7N 5A8 Canada
6. Center for Northern Agroforestry and Afforestation University of Saskatchewan Saskatoon SK S7N 5A8 Canada
7. Department of Plant Science University of Connecticut Storrs CT 06269 USA
8. Institut de Recherche en Biologie Végétale University of Montréal Montréal QC H3C 3J7 Canada
9. Southern Research and Outreach Center University of Minnesota Waseca MN 56093 USA
10. Department of Biology State University of New York at Potsdam Potsdam NY 13676 USA
11. Department of Crop Sciences University of Illinois Urbana IL 61801 USA