1. Southeast Research and Extension Center Univ. Nebraska‐Lincoln 1705 Stone St. Falls City NE 68355
2. Southeast Research and Extension Center Univ. of Nebraska‐Lincoln 1071 CR G Ithaca NE 68033
3. Dep. of Agronomy and Horticulture Univ. of Nebraska‐Lincoln 165 Keim Hall Lincoln NE 68583
4. Southeast Research and Extension Center Univ. of Nebraska‐Lincoln 2345 Nebraska Ave. York NE 68467
5. Department of Statistics Univ. of Nebraska‐Lincoln 340 Hardin Hall North Lincoln NE 68583