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Orange-fleshed sweetpotato (OFSP) is a rich plant-based source of beta-carotene, which the body converts into vitamin A. In sub-Saharan Africa, sweetpotato is known as a food security crop but most varieties grown are high dry matter white-fleshed types, lacking beta-carotene. In 1995, researcher...


Low, J.W.Mwanga, R.O.M.Andrade, M.I.Carey, E.Ball, A.M.[Tackling vitamin A deficiency with biofortified sweetpotato in sub-Saharan Africa.]Tackling vitamin A deficiency with biofortified sweetpotato in sub-Saharan Africa.

Vitamin A (VA) deficiency (VAD) is a major nutritional public health problem among children under-5-years-old in the developing world including Kenya. A community-based crosssectional survey among 1,630 children (aged 6-23 mos) was undertaken in Western Kenya. A questionnaire was administered to ...


Oyunga, M.A.Grant, F.K.E.Omondi, D.O.Ouédraogo, H.Levin, C.Low, J.W.[Prevalence and predictors of vitamin a deficiency among infants in Western Kenya using a cross-sectional analysis.]Prevalence and predictors of vitamin a deficiency among infants in Western Kenya using a cross-sectional analysis.

While micronutrient malnutrition has become a major public health problem in developing countries, consumption of biofortified foods such as orange fleshed sweet potato has proved to be cost effective means of addressing vitamin A deficiency. This paper describes consumer preferences and willingn...


Bocher, T.Sindi, K.Muzhingi, T.Nshimiyimana, J.C.Nzamwita, M.Low, J.W.[Investigating consumer preferences and willingness to pay for Orange-fleshed Sweet potato (OFSP) juice in Rwanda.]Investigating consumer preferences and willingness to pay for Orange-fleshed Sweet potato (OFSP) juice in Rwanda.

Kaguongo, W.Ortmann, G.Wale, E.Darroch, M.Low, J.W.[Factors influencing adoption and intensity of adoption of orange flesh sweet potato varieties: Evidence from an extension intervention in Nyanza and Western provinces, Kenya.]Factors influencing adoption and intensity of adoption of orange flesh sweet potato varieties: Evidence from an extension intervention in Nyanza and Western provinces, Kenya.

In Sub-Saharan Africa, sweetpotato pre-basic seed is multiplied in screenhouses using a sterilized soil substrate. This is expensive and unsustainable. The use of sand substrate with a fertigation system (“sandponics”), is an alternative. The study compared the cost-effectiveness for pre-basic se...


Makokha, P.Ssali, R.T.Rajendran, S.Wanjala, B.W.Matasyoh, L.G.Kiplagat, O.K.Low, J.W.McEwan, M.[Comparative analysis for producing sweetpotato pre-basic seed using sandponics and conventional systems.]Comparative analysis for producing sweetpotato pre-basic seed using sandponics and conventional systems.

Sweetpotato virus disease (SPVD) causes more than 90 percent yield decline, especially in areas with high disease pressure. In central Uganda region, Ejumula, an SPVD susceptible variety almost disappeared on farmers' fields due to SPVD by fourth implementation year HarvestPlus project in 2010. I...


Namanda, S.Mwanga, R.Mukasa, S.Talengera, D.Musoke, C.Kyalo, G.Ssemakula, G.Magezi, S.Ball, A.-M.Low, J.W.[Sweetpotato virus pathogen-tested planting material of susceptible varieties results in root yield increase in Uganda.]Sweetpotato virus pathogen-tested planting material of susceptible varieties results in root yield increase in Uganda.

Okello, J.J.Shikuku, K.M.Sindi, K.Low, J.W.[Farmers' perceptions of orange-fleshed sweetpotato: Do common beliefs about sweetpotato production and consumption really matter?]Farmers' perceptions of orange-fleshed sweetpotato: Do common beliefs about sweetpotato production and consumption really matter?

The development and scaling of orange-fleshed sweetpotato (OFSP) during the past 25 years is a case study of a disruptive innovation to address a pressing need – the high levels of vitamin A deficiency among children under five years of age in sub-Saharan Africa. When the innovation was introduce...


Low, J.W.Thiele, Graham[Understanding innovation: The development and scaling of orange-fleshed sweetpotato in major African food systems.]Understanding innovation: The development and scaling of orange-fleshed sweetpotato in major African food systems.

Cole, D.C.Levin, C.Loechl, C.Thiele, GrahamGrant, F.Webb Girard, A.Sindi, K.Low, J.W.[Planning an integrated agriculture and health program and designing its evaluation: Experience from Western Kenya.]Planning an integrated agriculture and health program and designing its evaluation: Experience from Western Kenya.

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