This book embodies work stretching over a fifteen year period. As a result· inevitably we are greatly indebted to a number of institutions and a large number of individuals. Over the years considerable administrative and financial help was provided by the Institute for Agricultural Research, Ahmadu Bello University, the Ministries of Agriculture and Natural Resources in the northern states of Nigeria, the Ford Foundation, and more recently, Kansas State University.
This book embodies work stretching over a fifteen year period. As a result· inevitably we are greatly indebted to a number of institutions and a larg...
