1. Univ. of Nebraska-Lincoln; Dep. of Agronomy and Horticulture; 321 Keim Hall Lincoln NE 68583
2. New Mexico State Univ., Farmington Agricultural Science Center; P.O. Box 1018 Farmington NM 87499
3. Univ. of Nebraska-Lincoln, Panhandle Research and Extension Center; 4502 Avenue I Scottsbluff NE 69361
4. Univ. of Nebraska-Lincoln; Dep. of Agronomy and Horticulture; 364 Keim Hall Lincoln NE 68583
5. USDA-ARS; 368 Keim Hall Lincoln NE 68583
6. A contribution of the University of Nebraska Agricultural Research Division, supported in part by funds provided through Anna Elliott Grant