| D. W. G. Treloar, MSc(Agric) |
1985-1988 |
| M. T. Partis, BSc, PhD, FIMA, MACE |
1989-1990 |
| M. W. Hill, BDSC, MSc, PhD |
1991-1992 |
| M. V. Sargent, PhD, DSc, FRSC, FRACI |
1993-1996 |
| N. G. Ashton, BA, PhD |
1997-1999 |
| C. MacLeod, BSc, MPhil, DPhil |
2000-2001 |
| D. J. Haskell, BCom, BA, PhD |
2001-2004 |
| G.B. Martin, BSc(Agric), PhD |
2005-2006 |
|