Agricultural Superintendent, Ministry of Agriculture and Natural Resources,
defunct Western Nigeria, 1962-64; Teaching and Research Assistant, University of British Columbia, Vancouver, Canada, 1964-69; Post-Doctoral Fellow:University of Gulf,mn Ontario, Canada, 1969-70; Research Associate, University of Guelph, Ontario, Canada, m1970-72; Lecturer, University of Ibadan, 1972; Senior Lecturer, 1973; Professor,Agriculture, University of Ibadan, 1975-88; Dean, Faculty of Agriculture and Forestry, University of Ibadan, 1978; V-chancellor, University of Agriculture, Abeokuta, 1988.
Editor-in-chief, Nigerian Journal of Science, Science Association of Nigeria, 1976-82; Governing Council, Lagos State College of Science and Technology, Lagos, 1977-79; Chairman, Governing Council, Lagos State Polytechnic, 1985; consultant, Research Institutes Review Panel of the Nigerian Science and Technology Development Agency, 1978; Associate Editor, Samaru Journal of Agricultural Research, 1978; elected Senate representative, Governing Council, University
of Ibadan, 1979-83; Chairman, Committee of Deans, University of Ibadan, 1979-80; Governing Council’s Ad-Hoc Committee on Problems Facing University Staff, University of Ibadan; Editorial Board for Water, Air and Soil Pollution (an International Journal of Environmental Pollution); Implementation Committee, University of Ibadan Council,
1980, United Nations Environment Programme Scientific Advisory Committee on Photosynthesis and Bioproductivity Project; Governing Board, International School, University of Ibadan, 1982; Chairman, Unbidden Agricultural Enterprises Management Board, 1982, Academic Planning Committee on Agriculture, Edo State University, Ekpoma, 1982; Local Organising Committee, Food and Agriculture Organisation, University of Ibadan, National Universities Commission/ Chairman, Accreditation Committee, 1986, NUC Committee on De-merging of Federal Universities of Technology and Creation of Universities of Agriculture, 1987; Lagos State Rural Development Council and Policy Committee, 1987
American Association for the Advancement of Science; American Society of Plant Physiologists; Canadian Federation of Biological Societies; International Association for Plant Physiology, International Plant Growth Substances Association; International Plant Growth Regulator Working Group, Association of Applied Biologists, Institute of Biology, West African Science Association;\ Society for International Development; Ecological Society of Nigeria, Fellow, The Linnean Society.
Hawk Ellertson Fellowship Awards, University of British Columbia, Vancouver, Canada, 1965-66, 1966-67; Pro-Mundi Beneficio Medal, Brazilian Academy of Humanities, 1975; Ford Foundation Travel Study Grant, 1974; Akewela, of Ikorodu, Lagos State.
Table and lawn tennis, landscaping, travelling
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