Competitiveness of Root Crops for Accelerating Africa’s Economic Growth, 12th Triennial Symposium of International Society for Tropical Root Crops Africa Branch (ISTRCAB), Accra, Ghana, 30 September- 5 October 2013 - Okechukwu, R.; Ntawuruhunga, P.; Dziedzoave, N.T.; Manu-Aduening, J.A.; International Society For Tropical Root Crops; Adu-Kwarteng, E.; Darko, M. N. (2013)