1. USDA–ARS, Soil and Water Management Research Unit, St Paul, MN
2. Department of Soil, Water and Climate, University of Minnesota, St Paul, MN
3. USDA–ARS, Soil Plant Nutrient Research Unit, Fort Collins, CO
4. USDA–ARS, Cropping Systems & Water Quality Research Unit, Columbia, MO
5. USDA–ARS, Northern Great Plains Research Laboratory, Mandan, ND
6. USDA–ARS, Sustainable Agricultural Systems Lab, Animal and Natural Resources Institute, Beltsville, MD
7. University of Missouri, Department of Soil, Environmental and Atmospheric Sciences, Columbia, MO
8. University of Missouri Greenley Center, Novelty, MO
9. NSW Department of Primary Industries, Beecroft, Australia
10. USDA–ARS, Vegetable and Forage Crops Production Research Unit, Prosser, WA