Catherine E. Stewart, Soil Management and Sugar Beet Research, USDA-ARS, Fort Collins, CO, Damaris Roosendaal, Soil Management and Sugar Beet Research Unit, USDA-ARS, Fort Collins, CO, Karolien Denef, Department of Chemistry, Central Instrument Facility, Colorado State University, Fort Collins, CA, Louise H. Comas, Water Management and Systems Research, USDA-ARS, Fort Collins, CO, Gautam Sarath, Grain, Forage, and Bioenergy Research Unit, USDA-ARS, Lincoln, NE, Virginia L. Jin, USDA-ARS, Lincoln, NE, US, Marty R. Schmer, Agroecosystem Research Management Unit, USDA ARS, Lincoln, NE and Madhavan Soundararajan, Department of Biochemistry, University of Nebraska, Lincoln, NE