INTERNATIONAL POSTS
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1972-73 Visiting Scientist May 1972 - February 1973 at Colorado State University. Pasture Physiology and Systems Analysis.
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1979-80 Visiting Scientist May 1979 - May 1980 at Centro Internacional de Agricultura Tropical, Cali, Colombia. Water relations and productivity of cassava.
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1986 Visiting Professor, Dept. Agronomy and Range Science, University of California, Davis, May to July, 1986.
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1988-89 Visiting Professor, Dept. Agronomy and Range Science, University of California, Davis, July 1988 - Jan 1989.
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1992 Visiting Professor, Facultad de Agronomía, Universidad de Buenos Aires, Argentina, January to March. Physiology of nitrogen response in sunflower.
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1992 Visiting Professor, Facultad de Agronomía, Universidad de Córdoba, Spain, April - June. Simulation modelling in sunflower.
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1996 Visiting Professor, Instituto de Agricultura Sostenible and Facultad de Agronomía, Universidad de Córdoba, Spain, January - June. Agronomy and simulation modelling.
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2001 Visiting Expert, FAO, Rome. Good Farming Practice, January - September
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2002-2003 Visiting Professor, Instituto de Agricultura Sostenible and Facultad de Agronomía, Universidad de Córdoba, Spain. Olive physiology, agronomy and simulation modelling.
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2004- Associate, AgSystems Group, Universidad Politécnica de Madrid
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2004 - International Consultant, Austria, Bangkok, Cambodia, Laos, Philippines, Paraguay, South Africa, China, Indonesia, Zimbabwe