1. Agronomy Dep. Iowa State Univ. 2104 Agronomy Hall, 716 Farm House Ln. Ames IA 50011‐1054 USA
2. Independent Maize Breeding Consultant 3445 Roseman Ln. DeKalb IL 60115 USA
3. Corteva Agriscience 7000 NW 62nd Ave. Johnston IA 50131 USA
4. Dep. of Economics Iowa State Univ. 260 Heady Hall, 518 Farm House Ln. Ames IA 50011‐1054 USA