African Crop Science Journal
The Journal of Tropical Crop Science and Production

Published by the African Crop Science Society

Editor-in-Chief:         J. S. Tenywa
Associate Editor: M.A. Bekunda
Scientific Editor:         M.P. Nampala
Faculty of Agriculture,  Makerere University,
P.O. Box 7062, Kampala, Uganda

INTERNATIONAL EDITORIAL ADVISORY BOARD

Iv. P. Van Damme, Universiteit Gent, Belgium
O. A. Chivinge, University of Zimbabwe, Harare
J. Dahlberg, USDA-ARS-TARS, Puerto Rico
A.M. Emechebe, IITA, Kano, Nigeria
B. Fawole, University of Ibadan, Nigeria
R.  A. Frederiksen, Texas A & M University, USA
J. H. Giliomee, University of Stellenbosch, S. Africa
R. Gibson, NRI/Greenwich University, UK.
J.J. Hakiza, NARO -Kawanda, Kampala, Uganda
R. Hammond, Ohio State University, OARDC, USA
L. Kimenye, University of Nairobi, Kenya
S. Kyamanywa, Makerere University, Kampala, Uganda
H.R. Mloza-Banda, Bunda College, Malawi
N.B. Lutaladio, FAO, Rome, Italy
J. Mugisha, Makerere University, Kampala, Uganda
P. Njuho, University of Natal, South Africa
B. R. Ntare, ICRISAT, Mali
K. Pixley, CIMMYT, Harare, Zimbabwe
R. C. Pratt, OARDC, Wooster, OH, USA
K. P. Sibuga, Sokoine University, Morogoro, Tanzania
L. Sperling, IPGRI, Rome, Italy
P. L. Woomer, Sacred Africa, Nairobi, Kenya
C. S. Wortmann,  University of Nebraska Lincoln, USA