Affiliation: | 1. Emeritus Professor of Agronomy and Horticulture, Univ. of Nebraska-Lincoln and retired Research Geneticist USDA-ARS, Lincoln, NE 68583-0937, USA;2. Retired Research Geneticist & Research Leader, Agricultural Research Service, US Dept of Agriculture, Lincoln, NE, USA;3. Research Rangeland Management Specialist, USDA-ARS, Great Plains Northern Research Laboratory, Mandan, ND58554, USA |