Kristin M. Trippe, USDA-ARS: NFSPRC, Corvallis, OR, US, Viola A. Manning, USDA-ARS, Corvallis, OR, US, Catherine L. Reardon, USDA-ARS, Adams, OR, US, Ann M. Klein, USDA-ARS, Adams, OR, Thomas F. Ducey, USDA-ARS, Florence, SC, US, Jeff M. Novak, USDA-ARS, Florence, SC, Gilbert Sigua, Soil Science and Plant Nutrition, USDA-ARS, Florence, SC, Mark G. Johnson, 200 S.W. 35th Street, US- EPA (Environmental Protection Agency), Corvallis, OR and Kurt A. Spokas, 439 - Borlaug Hall, USDA-ARS, St. Paul, MN