I.Certificate of advanced soil microbiological training: International Institute of Tropical Agriculture (IITA), Ibadan, Nigeria, July (1974) (attached).
II. Certificate of Accomplishment: Microbiological skills of handling Rhizobium and the laboratory and greenhouse and field procedures for testing, producing and using Rhizobium in tropical soils: NifTAL project, University of Hawaii, P.O. Box ‘0’, Paia, Hawaii, U.S.A. (1983) (attached).
III. An FAO/IAEA certificate on the use of isotopes and  techniques   on soil – plant relationships with emphasis on biological nitrogen fixation: International Atomic Energy Agency (IAEA), Seibersdorf Laboratory (NearVienna), Austria, (1985) (attached).