During this reporting period, the promising OSP clones in on-farm and on-station trials; SPK004/2006/1136 and NASPOT7/2006/292 were released by the Variety release Committee as NASPOT 12 O (Namulonge Sweetpotato 12 orange) and NASPOT 13 O, respectively. CIP in collaboration with NaCRRI planted 55 on-farm trials with six OSP clones, Ejumula(OP)2012/3, Ejumula(OP)2012/11, Ejumula(OP)2012/9, Ejumula(OP)2012/10, Resisto(OP)2012/1 and NASPOT 10 O (common check). The clone Resisto/2012/2 had the highest average yield of 20 tons/ha followed by Ejumula/ 2012/10 which yielded 16.3 tons /ha on average. The 2 clones are promising and will be assessed further in the second season. CIP setup curing and storage trials in September 2013 in Masaka, Rakai and Mukono districts. Curing trials were set up with 2 curing treatments- under-ground curing for 2-5 and 7 days and curing in moist saw dust for the same period. Storage experiments were also setup with 2 treatments- storage in sand and storage in the open. Roots left in the open had lost a lot of weight after 60 days (16-73 %) compared to those stored in sand (8-24 %). NASPOT 8 had the highest weight loss in sand (24%) while the local variety SOCCADIDO had the lowest weight loss. Similarly roots stored in sand, had less weevil infestations compared to those left in the open. When tasted for palatability, NASPOT 8 stored in sand for 60 days was more preferred than the one that had been freshly harvested because it was very sweet. The rest of the varieties that had been stored had a bad appearance and taste, and were therefore not liked. Roots cured in ground for 3, 4 and 5 days were stored for 60 days with minimal rotting, shriveling and sprouting, and could still be eaten. In ground curing for 3- 5 days is therefore showing good prospects especially for the market where traders keep the roots for about 1-2 weeks. BioCrops continued with vine multiplication activities in the screen house and supplied 40,000 vine cuttings to CIP. MAK continued conserving in vitro plantlets of the three varieties, Ejumula, Kabode and Vita. A total of 85 community resource persons, 9 extension workers and 53 farmers were trained in application of the triple S method to produce sweetpotato planting material. Demonstrations were also setup with triple S method of producing vines. At all sites, the triple S method significantly (P=<0.05) resulted in more numbers of cuttings produced per root-shoot than from previously harvested fields.
Authors: Robert Mwanga, Gerald kyalo, Simon Heck, Jan W. Low, Gorrettie Ssemakula, M. Ssetumba, Sam Namanda, David Talengera, Robert Mwanga, Gerald kyalo, Simon Heck, Jan W. Low, Gorrettie Ssemakula, M. Ssetumba, Sam Namanda, David Talengera
Publisher: International Potato Center
Publication Date: 2016