@INBOOK {MANYONG:2002,
title = {Agricultural transformation and fertilizer use in the cereal-based systems of the northern Guinea savanna},
author = {Manyong, V. and Makinde, K. and Ogungbile, A. },
year = {2002},
type = {Integrated plant nutrient management in sub-Saharan Africa: from concept to practice},
publisher = {Wallingford, UK: CABI; International Institute of Tropical Agriculture (IITA)},
note = {chapter 5},
}