@INBOOK {EZUMAH:1988, title = {Linking similar crop enviroments: relevant agronomic data}, author = {Ezumah, H. C. and Gichuru, M. }, year = {1988}, type = {Cassava-based cropping systems research 1}, pages = {31--36}, publisher = {International Institute of Tropical Agriculture (IITA)}, address = {Ibadan, Nigeria}, }