1. USDA-ARS; J. Phil Campbell, Sr., Natural Resource Conservation Center Watkinsville GA 30677
2. Empresa Brasileira de Pesquisa Agropecuária (Embrapa Trigo); Passo Fundo Rio Grande do Sul Brazil 99001-970
3. Friedman School of Nutrition Sci. and Policy, Tufts Univ.; Boston MA 02111
4. Univ. of Georgia; Dep. of Crop and Soil Sciences; Athens GA 30602
5. USDA-ARS; Coastal Plains Soil, Water, and Plant Res.Ctr.; Florence SC 29501
6. USDA-ARS; National Soil Dynamics Lab.; Auburn AL 36832
7. USDA-ARS; Cropping Systems and Water Quality Res. Unit; Columbia MO 65211
8. USDA-ARS; National Sedimentation Lab.; Oxford MS 38655
9. USDA-ARS; Grassland Soil and Water Res. Lab.; Temple TX 76502
10. USDA-ARS; Southern Plains Conserv.Production Rese. Lab.; Bushland TX 79012
11. USDA-ARS; Southeast Watershed Res. Lab.; Tifton GA 31793
12. Univ. of Tennessee; Biosystems Engineering and Soil Science Dep.; Jackson TN 38301