1. Division of Forestry and Natural Resources West Virginia Univ. Morgantown WV 26505 USA
2. USDA Natural Resource Conservation Service Decorah IA 52101 USA
3. Division of Plant and Soil Sciences West Virginia Univ. Morgantown WV 26505 USA
4. Dep. of Soil Science Univ. of Wisconsin‐Madison Madison WI 53706 USA