Browsing by Author "Tibanyedera, Deo"

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    Bridging the gap in quality and quantity of seed potatoes through farmer managed screen houses in Uganda
    (African Journal of Plant Science, 2017) Byarugaba, Arinaitwe Abel; Kyooma, John; Aheisibwe, Rwaheru Ambrose; Tibanyedera, Deo; Barekye, Alex
    Quality seed potato is a key factor in enhancing potato yields in Uganda. Available disease-free seed potato accounts for less than 5% of the whole potato seed market demand in Uganda leaving 95% as seed availability gap. This study was conducted to explore the potential of using farmer managed screen houses to alleviate the seed potato availability gap that exists in Uganda. Six screen houses of 7 m × 14 m each with capacity of 1620 plants were set up, three (3) screen houses in Bukimbiri, one (1) in Kisoro, one (1) in Hamurwa and one (1) in Maziba sites. All the sites were managed by trained six famers. Sterilized soil was used to reduce the incidence of pathogens and to ensure that clean minitubers were produced. Seed production was done in 2015 for two consecutive seasons (A and B). From the 6 screen houses, a total of 107,638 clean mini-tubers were generated across the sites for both seasons. At multiplication ratio of 1: 9 the generated mini-tubers have the potential of generating 968,742 tubers. This would reduce on existing seed gap for the next season. It was noted during the study that mini-tuber production, vigour and rate of growth varied significantly (P<0.001) across the varieties with ‘Rwangume’ achieving the highest yield in terms of tuber number per plant and height, compared to other 4 varieties (Kiningi, Rwashaki, Kachpot 1 and Victoria). This study showed that production of disease free mini-tuber at farmer level is possible using screen house technology and has a potential of reducing the seed availability gap through production of quality seed that can be accessed by other farmers
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    Genotype by environment interaction (GxE) as a measure of yield stability of Dutch potato varieties in Uganda
    (African Journal of Agricultural Research, 2018) Byarugaba, Arinaitwe Abel; Benon, Mateeka; Tibanyedera, Deo; Barekye, Alex
    Twenty one (21) Dutch potato varieties were introduced in Uganda during 2015-2016 seasons for national yield performance and adaptability studies so that most stable varieties could be identified for production. The effect of genotype (G), environment (E) and their interaction (G x E) on tuber yield was assessed to establish variety adaptation in different agro ecologies. Five sites were used in the study that included; Kalegyere (2450 m/asl), Kachwekano (2225m/asl), Rwebitaba (1531m/asl), Buginyanya (1887m/asl) and Zeu-DFI (1642m/asl). The varieties that yielded highest were; El-mundo (22 t ha-1), Sarpomira (22 t ha-1), Connect (21.7T/ha), Rudolph (21.4t ha-1), Arizona (20.3 t ha-1), Voyager (20 t ha-1), Faluka (19.9 t ha-1) and Sagitta (19.9 t ha-1). GxE analysis was done using Additive main effects and multiplicative interaction (AMMI) and results showed that GxE interaction accounted for 12.6% of the total variation, while genotypes and environments accounted for 5.7% and 59.7% of the total variation respectively. The AMMI bi-plots identified varieties Caruso, Derby, Voyager, Royal, Navigator, Manitou, Destiny, Musica and Markies to have the lowest (0.00033-0.6609) IPCA 1 score hence were most adapted. Varieties Rwagume, Sarpo Mira, Connect and Kachpot 1 were more adapted at Kalegyere site (-3.601 IPCA1 score) while Sarpo Mira, Connect, El-Mundo and Rudolph were adapted at Kachwekano site (-0.562 IPCA1 score). Varieties Arizona, Faluka, Panamera and Connect were adapted at Zeu (0.125 IPCA1 score). Varieties El-Mundo, Arizona, Rudolph and Connect were more adapted at Buginyanya ZARDI (0.498 IPCA1 score) while El-Mundo, Rudolph, Sagitta and Royal most adapted at Rwebitaba ZARDI (3.54 IPCA1 score). The most interactive genotype was Rwagume with interaction score of - 2.30516 while the least interactive genotype were Caruso and Taurus with IPCA 1 score of 0.00033 and 0.01086 respectively.