Joy Geraldine Adiele¹, Lawrence Chukwu², Anthony Ano³, Stefan Hauser⁴, Ahamefule Stephen Nwaogu⁵, Chiedozie Ngozi Egesi³ and Nnamdi Echendu⁶, (1)Plant Production Systems, Wageningen University & Research Centre, Umuahia, Abia, NIGERIA, (2)Soil Science/Cassava Program, National Root Crops Research Institute, Umudike Abia Nigeria, Umuahia, Nigeria, (3)National Root Crops Research Institute, Umudike, Nigeria, (4)International Institute for Tropical Agriculture Ibadan Nigeria, Ibadan, Nigeria, (5)Biotechnology, National Root Crops Research Institute, Umudike Nigeria, Umuahia, Nigeria, (6)National Root Crops Research Institute, Umudike Abia Nigeria, Umuahia, Nigeria