1. McCain Foods Oakbrook Terrace IL 60181 USA
2. USDA‐ARS Cropping System and Water Quality Res. Unit Columbia MO 65211 USA
3. Dep. of Plant Science Univ. of Missouri Columbia MO 65211 USA
4. Dep. of Agronomy Purdue Univ. West Lafayette IN 47907 USA
5. Dep. of Agronomy and Horticulture Univ. of Nebraska‐Lincoln Lincoln NE 68583 USA
6. Dep. of Soil, Water, and Climate Univ. of Minnesota St. Paul MN 55108 USA
7. Dep. of Soil Science North Dakota State Univ. Fargo ND 58105 USA
8. Dep. of Soil Science Univ. of Wisconsin‐Madison Madison WI 53706 USA
9. Dep. of Crop Sciences Univ. of Illinois at Urbana‐Champaign Urbana IL 61801 USA
10. Dep. of Agronomy Iowa State Univ. Ames IA 50011 USA