Uganda Journal of Agricultural Sciences

Impact of Improved Maize and Bean Varieties on Household Income and Food Security in Uganda.

Isaac Kiyingi — 2024-05-20

The National Agricultural Research Organisation (NARO) and development partners have invested substantial resources in breeding maize and bean varieties over the years. However, the impact of the varieties on productivity, household income and food security is not well documented. This paper evaluated the ex-post impact of adopting NARO released bean and maize varieties over the last five years on the productivity, household income and food security in Uganda. Data were collected from 30 districts in Uganda through a cross-sectional household survey of 1445 households, focus group discussions and key informant interviews. Using propensity score matching and endogenous switching regression models, the results showed that adoption of improved bean and maize varieties significantly increased crop productivity, household income and food security. This evidence suggests that there were tangible benefits from funding the development of bean and maize varieties in Uganda. The results indicate that although adoption of the improved bean and maize varieties increased productivity, it was still far below the research production output. This suggests that in addition to developing and disseminating the appropriate varieties, emphasis should be put on training farmers to use the complimentary inputs and practices to get the full benefit of the improved varieties.

Quality and Price of Beans at the Market Node in Five Districts of Uganda.

Immaculate Babirye — 2024-05-17

We investigated the varieties of beans traded in five districts of Uganda and the factors affecting the quality and price of the beans at the market node. A semi-linear hedonic price model with 12 variables categorized as product and trader attributes was used to determine the factors influencing prices. Traders were found to be unmindful of the names of new bean varieties released by NARO. They used various names for both the new and local varieties. Brokers were identified as the leading suppliers of poor-quality beans. The respondents cited variations in the quality of beans received from different suppliers. Beans that were owned by traders exhibited slightly higher moisture content (17%) than is recommended. Storage insect infestation was identified as the primary cause of quality decline. Product attributes were associated with changes in the prices of beans. However, their effect was comparatively lower than the traders’ characteristics. We recommend targeted sensitization about new bean varieties, emphasizing their benefits, post-harvest handling, and quality requirements at all value chain nodes. Monitoring trader traits and societal factors associated with price fluctuations is also crucial to price stability.

Identification of a New Domestic Pig Cell Line for Growth of African Swine Fever Viruses for Vaccine Production in Uganda.

Tonny Kabuuka — 2024-05-20

In this study, a basis for the feasibility of a successful ASF vaccine design program using live attenuated vaccines was sought. One of the challenges to African swine fever (ASF) vaccine development is having a cell line that will provide commercial utility for vaccine production. We set out to address this problem by innovatively identifying possible cell lines from local domestic pigs in the country. Eight tissue types from ASF-negative animals were identified for incorporation into cell line development. These were degraded, incubated, and monitored for cell growth. One cell line, the SIR2-P, grew consistently and confluently and was tested for the ability to grow and isolate field ASF viruses. We report the isolation of ASF viruses in our laboratory for the first time. The P9C virus from Namayingo district exhibited the largest plaque sizes compared to the SQ517B virus from Mukono. The innovative identification of the SIR2-P cell line is proof of concept that newer speciesspecific cell lines can be developed in the Infectious Animal Disease Laboratory (IADL), and utilized to study other animal viruses like Porcine Reproductive and Respiratory Syndrome (PRRS) virus, Foot and mouth disease (FMD) virus, and Swine Influenza. Such cells can be used in vaccine production for other endemic diseases in Uganda. The SIR2-P cell line is currently at passage 65.

Incidence and Severity of Bacterial Wilt Disease on Three Eggplant (Solanum melongena L.) Varieties in Central Uganda.

Immaculate Mugisa — 2024-05-20

This study was aimed at evaluating three eggplant varieties for response to bacterial wilt disease, to guide recommendations to farmers in central Uganda. Experiments were conducted at four sites under field conditions in 2016 and 2017 in central Uganda during three planting seasons. Two commercial eggplant varieties, namely, “Black beauty” and “Long purple”, were tested alongside one newly introduced variety, the “Thai long green”. Data was collected on disease incidence, severity and fruit yield. Analysis of variance revealed statistically significant differences in disease incidence, severity, and fruit yield across seasons, varieties and sites. The “Thai long green” variety proved to be a superior in terms of bacterial wilt resistance, showing the lowest levels of mean disease severity (1.5) and incidence (14%). The long purple variety was the most susceptible. “Thai long green” also attained highest average yields (14.86 t/ha), fruit weight per plant (1.2 kg) and fruit number per plant (9), across all locations for the three seasons. Therefore, we recommend promotion of the “Thai long green” variety in the region.

Sustainability of Fish-Hydropower Dam Interaction: A Case Study of River Nyamugasani ecosystem, Albertine Graben

Samuel Bassa — 2024-05-17

This study examined the River Nyamugasani ecosystem in western Uganda, evaluating fish diversity status before and after construction of a hydropower dam between 2015 - 2019 and 2021 - 2022. Using both electro fisher and minnow traps as the main fishing gears at ten preselected sites within the hydropower project areas, the study sampled 1,866 fishes from twenty-four (24) species, including the endemic Varicorhinus Ruwenzori, Pellegrin 1909. Nyamu II PH areas registered higher diversity (Simpson index of 0.8862) potentially attributed by hydrological alterations from hydropower dams. The findings emphasize the need for hydropower management need to consider fish stock controls, restorations and conservation measures, especially for the
endemic Varicorhinus Ruwenzori species.

Measures for Reducing Tomato Post-Harvest Losses at Farmer Level in the Lake Victoria Crescent Agro-Ecological Zone.

Damalie Babirye Magala — 2024-05-20

Globally, tomatoes (Solanum lycopersicum) are recognized as a significant vegetable crop with nutritional, health, and economic importance. In Uganda, small-scale tomato farmers, obtain low yields due to biotic and abiotic conditions of pests, diseases, lack of irrigation, and insufficient knowledge of sustainable farming practices. Post-harvest losses further hinder tomato production by limiting the amount of high-quality produce reaching the market. This study used a largely qualitative approach to understand the mechanisms tomato farmers in Wakiso and Luwero districts in Central Uganda use to reduce post-harvest losses at farm level. The study reveals that the Assila F1 Hybrid is the predominant variety—chosen for its firmness, extended shelf life, and resistance to pests and diseases. Farmers adopted staggered planting to manage post-harvest losses, harvesting mature green tomatoes in the morning and evening. However, a lack of technical expertise resulted in a deficiency of deliberate post-harvest treatments, and the absence of a mandatory body for produce inspection negatively impacted quality. Individual sales by farmers without standardized measurements also contributed to exploitation by middlemen. The study recommends farmers’ capacity building in appropriate post-harvest handling practices.