Virginia L. Jin, USDA-ARS, Lincoln, NE, US, Marty R. Schmer, Agroecosystem Research Management Unit, USDA ARS, Lincoln, NE, Catherine Stewart, Agronomy, Kansas State University, Manhattan, KS, Candiss Williams, Federal Bldg Rm 152, USDA-NRCS, Lincoln, NE, Robert B. Mitchell, Wheat, Sorghum, and Forage Research Unit, USDA-ARS, Lincoln, NE, Gary E. Varvel, Agroecosystem Management Research Unit, USDA-ARS, Lincoln, NE, Ronald F. Follett, Soil Plant Nutrient Research, USDA-ARS, Fort Collins, CO, Kenneth P. Vogel, Grain, Forage, and Bioenergy Research Unit, USDA-ARS, Lincoln, NE and Brian J. Wienhold, UNL, East Campus, USDA-ARS, Lincoln, NE