1. USDA‐ARS J. Phil Campbell, Senior, Natural Resource Conservation Center Watkinsville GA 30677
2. Dep. of Horticulture Univ. of Georgia, UGA‐Tifton Campus Tifton GA 31793
3. USDA‐ARS National Soil Dynamics Lab. Auburn AL 36832
4. New Crops Program Virginia State Univ. Petersburg VA 23806