1. Center for AgroforestryUniv. of Missouri203 ABNR Bldg.ColumbiaMO65211
2. USDA–ARS, Cropping Systems and Water Quality Research Unit269 Ag. Eng. Bldg.ColumbiaMO65211
3. Dep. of Soil, Environmental and Atmospheric SciencesUniv. of Missouri302 ABNR Bldg.ColumbiaMO65211