1. Dep. of AgronomyUniv. of Florida2183 McCarty HallGainesvilleFL32611
2. USDA‐ARS1925 Linden Dr. W., Univ. of WisconsinMadisonWI53706
3. Dep. of AgronomyUniv. of GeorgiaAthensGA30602
4. Univ. of Nebraska Panhandle Res. and Ext. Ctr.4502 Avenue, IScottsbluffNE69361
5. Dep. of AgronomyUniv. of KentuckyLexingtonKY40506