1. University of Tennessee; Knoxville TN USA
2. University of Tennessee West TN Research and Education Center; Jackson TN USA
3. South Dakota State University; Brookings SD USA
4. Iowa State University; Ames IA USA
5. Penn State University; University Park PA USA
6. Kansas State University; Manhattan KS USA
7. University of Arkansas; Lonoke AR USA
8. Michigan State University; East Lansing MI USA
9. LSU AgCenter; Alexandria LA USA
10. LSU AgCenter; St Joseph LA USA
11. University of Georgia; Tifton GA USA
12. Texas A&M AgriLife Research; Beeville TX USA
13. University of Kentucky; Princeton KY USA
14. Mississippi State University; Stoneville MS USA
15. University of Missouri; Columbia MO USA
16. Western Illinois University; Macomb IL USA
17. Texas Tech University; Lubbock TX USA
18. University of Nebraska; Concord NE USA
19. University of Wisconsin; Madison WI USA
20. University of Nebraska; North Platte NE USA