Distinguished Service Award

1. 1980   Henry L. Dean; Karl E. Goellner; George Knaphus; Otto Knauth; Leland L. Wilson
2. 1981   Benard Clausen; Lynn W. Glass; Leland P. Johnson; Clifford McCollum
3. 1982   Dean M. Rosa; Stanley L. Weinberg; Nels R. Lersten; Roger Q Landers
4. 1983   Paul Waite
5. 1984   G. Edgar Folk, Jr.
6. 1985   Harry T. Horner
7. 1986   Donald R. Farrar
8. 1987   Council for Ag. Science and Technology
9. 1988   Jean C. Prior
10. 1989   Duane C. Spriestersbach
11. 1990   No Award
12. 1991    No Award
13. 1992   James L. Christiansen
14. 1993   No Award
15. 1994   Lois Tiffany
16. 1995   Harold S. McNabb, Jr.
17. 1996   Paul A. Christiansen
18. 1997   Aldo Leopold Center for Sustainable Agriculture
19. 1998   Paul E. Rider
20. 1999   Daryl Smith
21. 2000  George Knaphus
22. 2001   Wayne I. Anderson
23. 2002   David V. McCalley
24. 2003   Iowa Children's Water Festival
25. 2004   Peggy Whitson
26. 2005   Lynn Brant
27. 2006   Douglas W. Jacobson
28. 2007   No Award
29. 2008   No Award
30. 2009   No Award
31. 2010   No Award
32. 2011    No Award
33. 2012   No Award
34. 2013   No Award
35. 2014   Thomas B. Ervin; John Pearson
36. 2015   Gene Lucas
37. 2016   No Award