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Carsky, R.J. ,  Douthwaite, Boru ,  Schulz, S. ,  Sanginga, Nteranya ,  Manyong, Victor M. ,  Diels, J. ,  Keatinge, J.D.H. ,  [Lessons for appropriate technology generation: example of soil management technology at IITA] ,  Lessons for appropriate technology generation: example of soil management technology at IITA