Browsing by Author "Geofrey, Gabiri"

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Assessment of hydro-pedological characteristics at medium-sized landslide sites in Manafwa catchment, Mount Elgon, Uganda
(Hydrological Sciences Journal, 2024-05-17) Moses, Kutosi; Yazidhi, Bamutaze; Bob, R. Nakileza; Yeeko, Kisira; Geofrey, Gabiri
Though strongly linked to landslides, hydro-pedological characteristics are inadequately investigated in the area. This study investigated hydro-pedological characteristics at medium landslide sites in Manafwa catchment. The design had twelve (12) infiltration experiments that were conducted at each site. To determine the selected soil physical properties, composite soil samples were extracted from the infiltration sites for soil laboratory analysis. Soil cores were extracted to determine saturated hydraulic conductivity (Ksat) and bulk density. The observed high values of IR and rapid Ksat underscore the susceptibility of the studied sites to landslide hazards. Additionally, soil organic matter (SOM), clay content, and bulk density further contribute to the understanding of the hydro-pedological factors influencing landslide occurrences. These findings reveal the need for comprehensive investigations into hydro-pedological characteristics of other landslide categories to assist in landslide risk assessment and management strategies.
Modelling the impact of land use/cover changes on water balance of a humid equatorial highland catchment in Southwestern Uganda, East Africa
(African Geographical Review, 2022-11) Loy, Turyabanawe Gumisiriza; Geofrey, Gabiri; Bernard, Barasa; Geoffrey, Mukisa; Claire, Nabatta
This study investigates impact of land use/cover change on water balance of River Mitano catchment in Southwestern Uganda using SWAT model. Land use/cover changes were assessed using three land use maps for years of 2000, 2010 and 2020. Water fluxes were simulated using observed daily discharge.14.4% of precipitation received is converted into discharge, with base flow (2.9%) and lateral flow (11.8%) major contributors. Conversion of grasslands to cropland and built-up areas were key changes. An increase in cropland (6.8%) and built-up areas (3.0%) at expense of grassland and wetland were noticed, with significant increase in monthly and annual groundwater flow.
Potential of moisture conservation practices to improve soil properties and nutrient status of Robusta coffee plant
(Agronomy, 2023-04) Judith, Kobusinge; Geofrey, Gabiri; Godfrey H., Kagezi; Godfrey, Sseremba; Alice, Nakitende; Geofrey, Arinaitwe; Charles K., Twesigye
Soil moisture conservation practices (SMCPs) have been adopted in Uganda to adapt to the effects of climate variability. However, limited information exists on how conservation measures influence the physico-chemical properties of soil and coffee leaf nutrient concentrations. Thus, we determined the effects of selected SMCPs on the soil physio-chemical properties and leaf nutrient concentrations in Robusta coffee in a randomized incomplete block design, replicated three times, in Kituza, Uganda. Soil samples were collected from 0 to 20 cm and 20 to 40 cm depths, and analyzed in the laboratory following standard procedures for selected physio-chemical properties. Coffee leaf samples were picked from each treatment (open sun coffee (COSS), coffee cover crop, Desmodium intortum (CCS), coffee mulch, Miscanthidium violoceum (CMS), and coffee A. coriaria (ACS)). Bulk density was significantly (p < 0.001) the highest under ACS (1.61 gcm−3) and lowest under CCS (1.29 gcm−3), and it significantly (p < 0.001) increased with depth. The soil organic matter was higher than the optimum range of 1–3% at the 0–20 cm depth across different SMCPs, but within the optimum range at the 20–40 cm depth. Leaf nitrogen was significantly the highest under ACS (3.19%) and lowest under COSS (2.30%). Overall, the findings suggest that SMCPs improve the soil physio-chemical attributes and leaf nutrients for sustainable coffee productivity. However, ACS improved the leaf plant nutrition better compared to other SMCPs.