1. USDA-ARS; Pasture Systems and Watershed Management Research Unit; Curtin Road University Park PA 16802
2. Agricultural Analytical Services Lab.; The Pennsylvania State Univ.; University Park PA 16802
3. Dep. of Crop and Soil Sciences; The Pennsylvania State Univ.; University Park PA 16802
4. USDA-ARS; Poultry Production and Product Safety Research Unit; Plant Sciences 115, Univ. of Arkansas Fayetteville AR 72701