Kristin M. Trippe1, Viola A. Manning2, Catherine L. Reardon3, Ann M. Klein4, Thomas F. Ducey5, Jeff M. Novak5, Gilbert Sigua6, Mark G. Johnson7 and Kurt A. Spokas8, (1)USDA-ARS: NFSPRC, Corvallis, OR, US, (2)USDA-ARS, Corvallis, OR, US, (3)USDA-ARS, Adams, OR, US, (4)USDA-ARS, Adams, OR, (5)USDA-ARS, Florence, SC, (6)Soil Science and Plant Nutrition, USDA-ARS, Florence, SC, (7)200 S.W. 35th Street, US- EPA (Environmental Protection Agency), Corvallis, OR, (8)439 - Borlaug Hall, USDA-ARS, St. Paul, MN