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Ek, G.A. van ,  Henriet, J. ,  Blade, S. ,  Singh, B. ,  [Quantitative assessment of traditional cropping systems in the Sudan savanna of northern Nigeria II. Management and productivity of major cropping systems] ,  Quantitative assessment of traditional cropping systems in the Sudan savanna of northern Nigeria II. Management and productivity of major cropping systems

Henriet, J. ,  Ek, G.A. van ,  Blade, S. ,  Singh, B. ,  [Quantitative assessment of traditional cropping systems in the Sudan savanna of northern Nigeria: I. Rapid survey of prevalent cropping systems] ,  Quantitative assessment of traditional cropping systems in the Sudan savanna of northern Nigeria: I. Rapid survey of prevalent cropping systems

Henriet, J. ,  Ek, G.A. van ,  Blade, S. ,  Singh, B. ,  [Quantitative assessment of traditional cropping systems in the Sudan savanna of northern Nigeria: III. Importance of trees, shrubs and secondary crops in the cropping systems] ,  Quantitative assessment of traditional cropping systems in the Sudan savanna of northern Nigeria: III. Importance of trees, shrubs and secondary crops in the cropping systems