“…poor soil fertility and heavy weed infestation. Since the publication of that paper, there have been many reports supporting this argument in West Africa (Saito, 2014(Saito, , 2016Saito & Futakuchi, 2014;Sito, Dieng, Vandamme, et al, 2015;Saito, Vandamme, Segda, et al, 2015;Vandamme et al, 2016a;Vandamme et al, 2016b). In East and Southern Africa, good performance of upland NERICA varieties has been frequently observed in field trials and on farm (Kijima et al, 2008;Sekiya et al, 2013;Shrestha et al, 2012).…”