1. Dep. of Agronomy and Horticulture Univ. of Nebraska‐Lincoln Lincoln NE 68583 USA
2. West Central Research and Extension Center Univ. of Nebraska‐ Lincoln North Platte NE 69101 USA
3. Bayer Crop Science, Water Utilization Learning Center Gothenburg NE 69138 USA
4. Dep. of Biological Systems Engineering Univ. of Nebraska‐Lincoln Lincoln NE 68583 USA
5. Dep. of Animal Science Univ. of Nebraska‐Lincoln Lincoln NE 68583 USA
6. Dep. of Statistics Univ. of Nebraska‐Lincoln Lincoln NE 68583 USA