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The IITA farming systems program by Okigbo, B.

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Effects of cover crops on soil structure and on yield of subsequent arable crops grown under strip tillage on an eroded alfisol. by Wilson, G.F., Lal, R., Okigbo, B.

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Intercropping systems in tropical Africa by Okigbo, B., Greenland, D.

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Grain legumes in the agriculture of the tropics by Okigbo, B.

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Root crop/oil palm farming systems: a case study from Eastern Nigeria by Lagemann, Johannes, Flinn, J.C., Okigbo, B., Moorman, F.R.

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Physiological aspects of intercropping by Okigbo, B.

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Fitting research to farming systems: based on observations and preliminary studies of traditional agriculture in Eastern Nigeria: paper presented at the Second International Semina... by Okigbo, B.

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Development of sustainable agricultural production systems in Africa: roles of international agricultural research centers and national agricultural research systems by Okigbo, B.

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Multidisciplinary approach to pest management and the African farmer by Okigbo, B.

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