2007 Participants
| Adler |
| AgSource |
| Asgrow |
| Banks |
| Circle , 319-989-2414 |
| Cornelius |
| Crow's |
| Dairyland |
| DEKALB |
| Epley , 319-885-6293 |
| Farm Advantage |
| Favored |
| Fielder's Choice |
| Fontanelle |
| Four Star |
| Freedom |
| Gold Country |
| Hobart , 712-464-7651 |
| Jung |
| Kaltenberg |
| Kruger |
| Lewis |
| LG Seeds |
| Merschman |
| Midwest Seed Genetics |
| Miller |
| Mycogen |
| NK Brand |
| NuTech |
| Premium , 800-345-7798 |
| Rainbow |
| Renk |
| Renze |
| Trisler |
| Viking |
