1. Department of Crop and Soil Science, Oregon State University, 109 Crop Science Building, 3050 SW Campus Way, Corvallis, Oregon 97331, United States
2. Department of Land, Air & Water Resources, University of California - Davis, One Shields Avenue, Davis, California 95616, United States
3. Pacific Northwest National Laboratory, 902 Batelle Blvd, Richland, Washington 99354, United States
4. Department of Natural and Applied Sciences, University of Wisconsin, 2420 Nicolet Drive, Green Bay, Wisconsin 54311, United States
5. Department of Geology, University of Georgia, 210 Field Street, Athens, Georgia 30602, United States