- University of Agriculture Abeokuta, 2000
- University of Ibadan, 1988
- University of Ife, 1979
- IITA, 1989
- Cambridge, 1992
- University of Reading, 1992
- IITA, 1992
- IITA, 1993
- IITA, 1993
- IITA, 2001
- University of Agriculture Abeokuta, 2004
- Ladoke Akintola University of Technology, 2006
