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Le dépôt numérique grenier du savoir du Burundi est une collection de documents scientifiques produits par les chercheurs de l'Université du Burundi, y compris des mémoires, des thèses, des revues, des articles, des rapports techniques, etc. Il s'agit du dépôt institutionnel officiel de l'Université du Burundi

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Grenier du Savoir du Burundi

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Les droits fonciers dans les ex-centres extra-coutumiers de Bujumbura sous leur double aspect historique et juridique
(UB, Droit, 1972)
Sahinguvu, Gérard
Effets directs et résiduels d’un tri-compost à base de paille de riz, fumier animal et source azotée altérnative (Tithonia Diversifolia ou urine de lapin) sur la production d’amarante
(UB, FS, 2026-03)
Bikorimana, Léonidas
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Sous la Direction de : Prof. Salvator Kaboneka
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Dr. Daniel Rucakumugufi
The progressive decline in soil fertility represents a major constraint to sustainable agricultural production in tropical regions, particularly in sub-Saharan Africa. In this context, the use of locally available organic amendments constitutes a viable alternative to mineral fertilizers. This study aimed to evaluate the direct and residual agronomic value of tri-composts based on rice straw and animal manures, enriched either with Tithonia diversifolia (Hemsl) A. Gray biomass or with rabbit urine, on the production of amaranth (Amaranthus spp.). The experiment was conducted under greenhouse conditions at the Faculty of Agronomy and Bioengineering, University of Burundi, using a randomized complete block design with eight treatments and three replications. A single application of 10 g of compost per pot (4 kg of soil) was incorporated before sowing. Amaranth was grown over four successive cropping cycles (eight months) to assess both the direct effect (first harvest) and the residual effect (three subsequent harvests). Measured parameters included shoot biomass, root biomass, total biomass, soil pH, and electrical conductivity (EC). Data were analyzed using analysis of variance (ANOVA) at the 5% significance level. Results showed that all tri-compost treatments significantly improved soil chemical properties and amaranth biomass production compared to the unamended control. Soil pH decreased from 9.06 in the control treatment to values ranging between 8.18 and 8.63 in tri-compost treatments (p < 0.001), indicating a buffering effect of organic amendments. Electrical conductivity was also significantly reduced, from 0.042 μS cm⁻¹ in the control to 0.022–0.030 μS cm⁻¹ in enriched compost treatments (P < 0.001). Across the four harvests, mean total biomass increased from 8.44±3.99 g in the control to 13.95 ± 2.23 g with cattle manure and 13.02 ± 1.63 g with the rabbit-urine-enriched tri-compost (B603A). Tri-composts enriched with Tithonia diversifolia (Hemsl) A. Gray produced total biomasses ranging from 11.02±3.31 g to 12.68±2.56 g. Root biomass differed significantly among treatments (p = 0.0356), with higher values recorded in enriched composts (1.63–1.75 g) compared to the control (0.98 g). The treatment × harvest interaction was significant for total biomass (p = 0.00785), indicating a gradual nutrient release and a strong residual effect of tri-composts during later harvests. In generally, tri-composts enriched with Tithonia diversifolia (Hemsl) A. Gray or rabbit urine significantly enhance soil fertility and amaranth productivity. Rabbit urine showed a rapid direct effect comparable to Tithonia diversifolia (Hemsl) A. Gray, confirming its potential as an effective local nitrogen source for sustainable tropical agriculture.
Analyse des déterminants du taux d’utilisation des services financiers au Burundi : 2000-2022
(UB, FSEG, 2026-02)
Niyubahwe, Zabulon
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Sous la direction du : Dr. Sinamenye Jean Petit
This study aiming to analyze the factors influencing the rate of use of financial services in Burundi (2000-2022) reveals major insights. Regarding short-term results, the study shows that in the short term, the overall rate of geographic penetration of financial services has a positive and significant influence, while competitive interest rates (loans and deposits) positively stimulate the rate of use of financial services in Burundi, without a significant effect. On the other hand, demographic coverage and income level (GDP per capita) do not have a significant impact, highlighting a challenge in aligning financial supply with the needs of vulnerable populations. In contrast, in the long term, the geographic expansion of financial services and attractive interest rates on deposits, they significantly stimulate the rate of use of financial services, while interest rates applied to credit hinder it. GDP per capita and demographic penetration have a positive impact, but they depend on the suitability of products to the needs of the population. Unlike the short term, where credit rates seemed beneficial (borrower selection), their effect becomes negative in the long term. Effective use of financial services therefore requires extensive infrastructure, balanced pricing policies, and services adapted to local realities. The results of this study highlight the need for an integrated approach to promote the use of financial services in Burundi. To achieve lasting effects, several complementary actions must be carried out simultaneously. First, special attention must be given to the development of financial infrastructure in rural areas, where access to banking services remains limited. This geographical expansion should be accompanied by balanced regulation of interest rates, aiming both to encourage savings through attractive returns and to ease credit access conditions for households and small businesses. Second, the provision of financial services must be adapted to local specificities and the real needs of different segments of the population.
Evaluation de l’état nutritionnel des patients diabétiques âgés de 15 ans et plus suivis dans les hôpitaux de Bujumbura
(UB, EANSI, 2026-06)
Nshimirimana, Innocent
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Sous direction de: Harimenshi Déo, PhD
Introduction: Diabetes mellitus is a major non-communicable chronic disease with a steadily increasing global prevalence. Nutrition plays a critical role in diabetes management; however, evidence on the nutritional status of patients with diabetes and its determinants remains limited, particularly in low-resource settings. This study aims to assess the nutritional status of diabetic patients aged 15 years and older receiving care in hospitals in Bujumbura and to identify associated factors. Methods: A cross-sectional analytical study was conducted in six tertiary referral hospitals in Bujumbura. The study included 384 diabetic patients aged 15 years and older, recruited through consecutive sampling. The primary outcome was nutritional status assessed using Body Mass Index (BMI), calculated from weight and height. Malnutrition was defined as a BMI. Data analysis was performed using STATA 17. Results: The average age of diabetic patients was 52 ± 10.5 years. The prevalence of inadequate nutritional status was 52% (95% CI: 47.0–57.0). Multivariate analysis identified factors associated with nutritional status. These included age (40–59 years: ORa = 0.18; 95% CI: 0.05–0.60; p = 0.006), secondary education (ORa= 0.10; 95% CI: 0.03–0.34; p < 0.001) and university education (ORa = 0.03; 95% CI: 0.01–0.12; p < 0.001), primary occupation (self-employed: ORa = 2.22; 95% CI: 1.15–4.27; p = 0.017), fruit consumption frequency (3–4 times per week: ORa = 0.32; 95% CI: 0.20–1.09; p = 0.010; daily consumption: ORa = 0.18; 95% CI: 0.05–0.41; p = 0.001), daily vegetable consumption (ORa = 0.15; 95% CI: 0.05–0.41; p < 0.001), adding sugar to beverages (ORa = 3.48; 95% CI: 1.68–7.19; p = 0.001), receiving nutritional counseling (ORa = 0.03; 95% CI: 0.004–0.259; p = 0.001), engaging in moderate to vigorous physical activity (ORa = 0.37; 95% CI: 0.18–0.77; p = 0.008), and frequency of alcohol consumption (1–4 days per week: ORa = 0.21; 95% CI: 0.09–0.49; p < 0.001) Conclusion: This study highlights the high prevalence of malnutrition among diabetic patients in Bujumbura. Nutritional status is shaped by socioeconomic, clinical, and behavioral factors. These findings underscore the need to strengthen nutritional interventions for diabetic patients and promote healthy lifestyles.
La production de biogaz par méthanisation de la panse des bovins : Effet d’addition de balles de riz
(UB,IPA, 2026-06)
Nduwimana, Audifax
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Sous la direction de : Directeur : Dr Rosine Ahishakiye
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Pr Patrice Bigumandondera
This study investigates biogas production through the anaerobic digestion of bovine rumen content, using rice husks as a co-substrate, with the aim of optimizing methane yield and evaluating the energy potential of the process. The experiment was conducted using five batch digesters of 4 L capacity operated under mesophilic conditions (35–37 °C) over a period of 36 days. The digesters were fed with different proportions of substrate and co-substrate, resulting in carbon-to-nitrogen (C/N) ratios ranging from 20 to 30. Biogas production was monitored daily using the water displacement method, while biogas composition was determined by carbon dioxide (𝐶𝑂₂) absorption in a potassium hydroxide (𝐾𝑂𝐻) solution, allowing the estimation of methane (𝐶𝐻₄) content. The results showed that biogas production followed a typical sigmoidal pattern, characterized by a lag phase (days 1–3), an exponential phase (days 4–10), a stationary phase (days 11–25), and a decline phase (days 26–36). Among the tested digesters, D3 with a C/N ratio of 25 exhibited the best performance, producing a cumulative biogas volume of 21,471mL and methane volume of 15,357mL, corresponding to a methane yield of 71.5%. Digesters D5 (C/N = 30) and D4 (C/N = 27,5) showed moderate performance, while D1 and D2 (C/N = 21.6 and 20) yielded lower results. These findings confirm that C/N ratios in the range of 25–30 enhance microbial activity and methane production. These results demonstrate that anaerobic digestion of organic waste constitutes a viable source of renewable energy. At a larger scale, this process shows significant potential to contribute to electricity production and the energy recovery of waste. In conclusion, the co-digestion of bovine rumen content with rice straw significantly improves biogas and methane production, particularly at an optimal C/N ratio of around 25. This approach represents an effective and environmentally friendly solution for waste valorization and energy generation.