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1971～1986年,尼日利亚伊巴丹国际热带农业研究所的甘薯育种方案是,在巴日利亚不施肥的土壤上培育和试验甘薯新品种。鉴定出贮藏块根产量高达52吨/公顷的栽培品种(Ha-hn 等,1984)。国际热带农业研究所培育的高产甘薯栽培品种197个种薯做发芽试验,在美国进行无性繁殖和选择,在不施肥的低氮水平(全 N10克/千克)的砂壤土上(Oxic Paleustalfs),
From 1971 to 1986, the sweet potato breeding program of the International Institute of Tropical Agriculture, Ibadan, Nigeria, was to breed and test new sweet potato varieties in soils not fertilized in the country. Cultivars of up to 52 tonnes / ha were identified (Ha-hn et al., 1984). A total of 197 seedlings of high-yielding sweet potato cultivars cultivated by the International Institute of Tropical Agriculture were germinated and tested for vegetative propagation and selection in the United States. Oxic Paleustalfs was used on sandy loam soil with low nitrogen levels (N 10 g / kg)