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Atehnkeng, J. ,  Nwigwe, C. ,  Agbicodo, E. ,  Opoku, A. ,  Obidiegwu, J.E. ,  Acha, I. ,  [Sustainable agriculture in subSaharan Africa: a critical look into the contraints and prospects: proceedings of the 13th Annual Lecture/Symposium by IARSAF held on 13th February 2008, IITA, Ibadan, Nigeria] ,  Sustainable agriculture in subSaharan Africa: a critical look into the contraints and prospects: proceedings of the 13th Annual Lecture/Symposium by IARSAF held on 13th February 2008, IITA, Ibadan, Nigeria