1. Northwest Soils & Irrigation Research Laboratory (USDA-ARS), Kimberly, Idaho 83341, United States
2. Federal Reserve Bank of Kansas City, Kansas City, Missouri 64198, United States
3. Department of Agricultural Economics, Utah State University, Logan, Utah 84322, United States
4. National Soil Erosion Research Laboratory (USDA-ARS), West Lafayette, Indiana 47907, United States