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In Lake Zone, Tanzania, farmers were trained to multiply and distribute quality sweetpotato planting material. The objectives of this study were to assess changes in skills and practices among the trained farmers as vine multiplication became a specialized task. Nine months after the project ende...


McEwan, M.Lusheshanija, D.Shikuku, K.M.Sindi, K.[Specialised sweetpotato vine multiplication in Lake Zone, Tanzania: What “sticks” and what changes?.]Specialised sweetpotato vine multiplication in Lake Zone, Tanzania: What “sticks” and what changes?.

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.

Vegetatively propagated crop (VPC) seed tends to remain true to varietal type but is bulky, often carries disease, and is slow to produce. So VPC seed needs to be handled differently than that of other crops, e.g., it tends to be sourced locally, often must be fresh, and it is less often sold on ...


Bentley, J.W.Andrade-Piedra, J.L.Demo, P.Dzomeku, B.M.Jacobsen, K.Kikulwe, E.Kromann, P.Kumar, L.McEwan, M.Mudege, Netsayi N.Ogero, K.Okechugwu, R.Orrego, R.Ospina, B.Sperling, L.Walsh, S.Thiele, Graham[Understanding root, tuber, and banana seed systems and coordination breakdown: A multi-stakeholder framework.]Understanding root, tuber, and banana seed systems and coordination breakdown: A multi-stakeholder framework.

This study examined the nutrition and food security impacts of a project that was designed to improve availability of disease-free planting materials of biofortified orange-fleshed sweetpotato (OFSP) in rural Tanzania. Difference-in-difference and matching techniques were employed to estimate cau...


Mashisia, K.Okello, J.J.Wambugu, S.Sindi, K.Low, J.W.McEwan, M.[Nutrition and food security impacts of quality seeds of biofortified orange-fleshed sweetpotato: Quasi-experimental evidence from Tanzania]Nutrition and food security impacts of quality seeds of biofortified orange-fleshed sweetpotato: Quasi-experimental evidence from Tanzania

We examined the effect of multidimensional farmers’ beliefs on the likelihood of cultivating planting materials of biofortified orange-fleshed sweetpotato (OFSP) varieties. Using a panel dataset and combining difference-in-differences regression with propensity score matching, results showed posi...


Shikuku, K.M.Okello, Julius JumaSindi, KirimiLow, J.W.McEwan, M.[Effect of Farmers’ Multidimensional Beliefs on Adoption of Biofortified Crops Evidence from Sweetpotato Farmers in Tanzania]Effect of Farmers’ Multidimensional Beliefs on Adoption of Biofortified Crops Evidence from Sweetpotato Farmers in Tanzania

Smallholders in Eastern and Southern Africa (ESA) have limited access to timely availability of quality sweetpotato seed which contributes to sub-optimal root yields. To enhance availability and access to quality seed it is necessary to link formal plant breeding efforts to a sustainable seed sup...


Rajendran, S.Kimenye, L.N.McEwan, M.[Strategies for the development of the sweetpotato early generation seed sector in eastern and southern Africa]Strategies for the development of the sweetpotato early generation seed sector in eastern and southern Africa

This study used discrete and count data regression models and data collected from 732 farm households in Tanzania to test the effect of participation on a project designed to break this quality “seed” bottleneck (via technology awareness and targeted access to clean planting materials) on: i) the...


Okello, A.Sindi, K.Shikuku, K.M.Low, J.W.McEwan, M.Nakazi, F.Namanda, S.Babu, A.Mafuru, J.[Effect of technology awareness and access on the conservation of clean planting materials of vegetatively produced crops: The case of sweetpotato.]Effect of technology awareness and access on the conservation of clean planting materials of vegetatively produced crops: The case of sweetpotato.
Low, J.W.McEwan, M.[Combating Vitamin A deficiency diseases: Building the evidence base and partnerships for food based approaches.]Combating Vitamin A deficiency diseases: Building the evidence base and partnerships for food based approaches.

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