Performance of proVitamin A cassava clones across eleven environments in two seasons in Nigeria - Parkes, Elizabeth Y.; Kulakow, Peter A.; Alamu, Emmanuel Oladeji; Maziya-Dixon, B.B.; Aina, O.O.; Ofei, R.; Iluebbey, Peter O.; Agbona, A.; Bakare, M.; Dixon, A. (World Congress on Root and Tuber Crops, 2016)