Editor

Dr Dave Harris
Principal Scientist
International Crops Research Institute for the Semi-Arid Tropics
(ICRISAT- Eastern and Southern Africa)
PO Box 39063
Nairobi,
Kenya
expag@cambridge.org

Editorial Board

Dr Sayed Azam-Ali
University of Nottingham, UK

Professor Mike K. V. Carr
Ilmington, UK

Dr Ric Coe
ICRAF, Kenya

Dr Peter J. M. Cooper
Motecombe, Dorset, UK

Professor R. Hereward V. Corley
Bedford, UK

Dr Eric T. Craswell
Australian National University, Australia

Dr Peter Q. Craufurd
University of Reading, UK

Dr Willie Erskine
CLIMA, University of Western Australia, Australia

Professor Elias Fereres
University of Córdoba, Spain

Dr David Gibbon
Shropshire, UK

Professor Peter J. Gregory
East Malling Research, UK

Professor Nuhu Hatibu
Kilimo Trust, Kampala, Uganda

Dr Amir Kassam
University of Reading, UK

Dr Christine King
The University of Queensland, Australia

Dr Rob Lockwood
Kent, UK

Ms Adrienne Martin
University of Greenwich, UK

Professor David Midmore
Central Queensland University, Australia

Professor Uzo Mokwunye
Accra, Ghana

Dr Ligia Noronha
The Energy and Resources Institute, New Delhi, India

Professor Calvin O. Qualset
University of California, USA

Dr F. Margaret Quin
Uki, New South Wales, Australia

Dr Nteranya Sanginga
TSB-CIAT, Nairobi, Kenya

Dr Subramaniam Shanmugasundaram
Somerset, New Jersey, USA

Dr Gurbachan Singh
Central Soil Salinity Research Institute, Karnal, India

Dr Geoff R. Squire
Scottish Crop Research Institute, UK

Dr Shirley Tarawali
International Livestock Research Institute (ILRI), Nairobi
, Kenya

Professor J. Trevor Walker
Alzeim Ltd, Talgarth, UK