Ethiopian Highlands Research Articles

Diet composition and diurnal activity patterns of gelada baboon (Theropithecus gelada)

AbstractGelada baboons (Theropithecus gelada) are the only surviving species of the genus Theropithecus and endemic to the highlands of Ethiopia. The present study deals with feeding ecology and diurnal activity patterns of gelada (T. gelada) in Wof‐Washa Forest, central Ethiopia. It was conducted from September 2016 to August 2017. Focal sampling technique for 10 min observation was employed to study the feeding ecology. Type of plant species consumed and parts eaten by gelada were recorded using binoculars during dry and wet seasons. On the other hand, data on diurnal activity patterns were collected using scan sampling technique. The activity patterns of bands under study were quantified by scanning at every 15‐min interval from 06:00 to 18:00 h. A total of 11 plant species that belong to 10 families were foraged by gelada during the wet and dry seasons. Grass was the main food source for geladas that contributed about 81% and 68% of their diet during the wet and dry seasons, respectively, while Thymus schimperi was the least consumed plant species during both wet (0.5%) and dry (1%) seasons. Grass blades were the most preferable food items by almost all age and sex categories. Daily activities of gelada were mainly dominated by feeding during both seasons. Geladas spent 58% of their time on foraging activity during the wet season and 67.2% of their time spent during the dry season. Geladas mainly depend on grasses for their diet in the study area. Therefore, to implement successful management and conservation of the species, the area needs to be properly protected.

Hydrologic Controls on Individual Ostracode Stable Isotopes in a Desert Lake: A Modern Baseline for Lake Turkana

AbstractStable carbon (δ13C) and oxygen (δ18O) isotope measurements in lacustrine ostracodes are widely used as paleolimnological indicators of past climate change. Previous work has used individual ostracode valves to resolve seasonal and subdecadal paleohydrological signals, yet replicated assessments of co‐occurring specimens from modern samples are rare. Here we focus on ostracodes from sediments collected in 1979 from Lake Turkana, an alkaline desert lake in tropical eastern Africa. Sourced from the Ethiopian highlands, the Omo River is the dominant inflow into this lake. We present individual ostracode valve analyses (IOVA) of δ13C and δ18O measurements (n = 329) of the extant benthic ostracode Sclerocypris clavularis from 17 sites spanning the entire lake (navg = ∼19 specimens/site). We demonstrate that the pooled statistics of individual valve measurements at each site are shaped by lake hydrology, superimposed over inter‐individual isotopic variations. Within‐site variance in IOVA‐δ13C is larger (∼60%) than that of IOVA‐δ18O. Yet, site‐based averages exhibit a systematic pattern, with higher δ values toward the southern part of the lake, away from Omo River inflow. We suggest that the latitudinal δ13C gradient may arise from low riverine δ13C and low organic matter δ13C as a productivity response to nutrient‐rich Omo River inflow toward the north. The δ18O pattern may be explained by the diminishing influence of Omo River inflows and more evaporation driving higher IOVA‐δ18O values toward the windier, southern basin. We conclude that pooled IOVA statistics in Omo‐Turkana sediments can aid interpretations of past regional paleohydrology and its variability in this basin.

The effect of land use type on selected soil physicochemical properties in Shihatig watershed, Dabat district, Northwest Ethiopia

Different land use practices have a substantial influence on soil quality. An inappropriate land use system in Ethiopia leads to extensive deforestation which aggravates the loss of soil fertility. Even though there are various studies conducted on the effect of land use type on soil physicochemical properties, it is inadequate in the northern highlands of Ethiopia, in particular in the Dabat district. Thus, this study aimed to assess the effect of land use type and soil depth on selected soil physicochemical properties in the Shihatig watershed, Northwest Ethiopia. A total of 24 undisturbed core and disturbed composite soil samples were collected from the four land use types (natural forest, grazing, cultivated, and Eucalyptus lands) and two depths (0–20 cm and 20–40 cm) with three replications. The physicochemical properties of the soil were determined using standard operating procedures. The two-way analysis of variances was conducted using SAS software, Version 9.4. The result showed that the texture and soil organic carbon were affected by land use type, soil depth, and the interaction of the two factors; while bulk density, soil moisture content, total nitrogen, available phosphorus, cation exchange capacity, and level of Mg2+ were significantly affected by both land use and soil depth, whereas pH and electrical conductivity were affected by only the land use type. The highest clay, pH, electrical conductivity, total nitrogen, cation exchange capacity, and exchangeable cations (Ca2+ and Mg2+) were recorded in the natural forest land, while the lowest values of the same parameters were found under cultivated land. The mean values of most of the soil properties were low in the cultivated and Eucalyptus lands. Therefore, adopting sustainable cropping systems such as crop rotation and the addition of organic manure, and minimizing planting the Eucalyptus tree is vital to improve the existing soil quality and enhance crop productivity.

Measure of indigenous perennial staple crop, Ensete ventricosum, associated with positive food security outcomes in southern Ethiopian highlands

Enset-based food systems are unique to southern Ethiopia where they serve as a staple food for millions of households. Enset, a banana relative of which the entire pseudostem and corm are edible, possesses a highly unusual combination of crop traits including perenniality, highly flexible planting and harvest times, and tolerance of a very wide range of environmental conditions, which together earn it the local name of “the tree against hunger.” Previous studies have identified the strategic food security value of mature enset stands for household food security, but a multisector panel data set makes identifying wider enset food security associations tractable for the first time. We assess whether household data on area of mature enset is associated with four indicators of food security together with demographic, asset, and consumption covariates. We find that area of mature enset significantly improves estimates for three of four food security indicators, thus improving our understanding of the role of understudied indigenous crops. Consistent and reliable food security indicators are needed to improve monitoring, particularly with regard to stability. Variance components of multilevel longitudinal models indicate that exposure to both idiosyncratic and covariate disturbance affects food security stability in a way that is consistent with reports of enset acting as both a food security buffer and an active adaptation strategy in the face of shocks or change. Here we show that living assets comprising culturally relevant indigenous crops such as enset can improve accuracy of food insecurity assessments, which may encourage wider investigation of other agrifood system-specific asset-like natural stores of value associated with food security and resilience.

Impact of land use/land cover changes on soil erosion risk in upper Mile River sub-watershed, North Eastern highlands of Ethiopia

ABSTRACT Unsustainable management of land resources aggravates land degradation. An accurate assessment of soil erosion is needed to reduce the problem of soil loss in highly fragile mountainous areas. Modeling the impact of LULCC on soil erosion is a vital process for watershed management planning. This study aimed to examine the effect of changing LULC on soil erosion in the upper Mile sub watershed, North Eastern highlands of Ethiopia. It was done by quantifying and evaluating soil erosion over years 1989–2018 in the area. The data was acquired from field surveys and secondary sources. The RUSLE was employed in a GIS environment to create soil erosion maps using the factors’. The soil loss model predicts 58.90%, 12.40%, 8.90%, and 8.89% of the sub-watershed has predicted as low, moderate, high and very high erosion risk, respectively. The mean annual soil loss rate of the area had increased from 16.07 tha−1 y−1 in 1989 to 17.26 tha−1 y−1 in 2003 and decrease to 12.94 tha−1y−1 in 2018. This was attributed to area closure interventions over the last two decades. The differences in soil erosion risk among the three periods suggested that changes in LULC have a significant impact on soil erosion risk.

Management of chocolate spot of Faba bean (Botrytis fabae) through fungicides and host resistance in North Shewa, Central Highland of Ethiopia

Management of chocolate spot of Faba bean (Botrytis fabae) through fungicides and host resistance in North Shewa, Central Highland of Ethiopia

Long-term hydroclimatic variability over the semi-arid Ethiopian highlands in relation to ENSO and IOD teleconnection signals

Long-term hydroclimatic variability over the semi-arid Ethiopian highlands in relation to ENSO and IOD teleconnection signals

Enset Production System Diversity across the Southern Ethiopian Highlands

Enset is a staple crop of the southern Ethiopian highlands. Small-holder farmers cultivate enset as part of mixed subsistence farming systems, in which enset provides substantial food security services. While its cultivation is unique to this region, enset production systems take on many forms, varying with environmental and agronomic conditions, crop diversity and (co-)staples produced, the importance of enset for the household, and socio-economic and cultural differences. Through extensive interviews with 375 households covering 20 communities, along an altitudinal range of 1500 to 3000 masl across the main enset-producing belt, the diversity in enset production systems was assessed. We show that the size of enset-producing land holdings and the overall cultivated farmland decreased with altitude. The economic status of households however drives the proportion of land allocated to enset, with relatively more land (45%) allocated to the cultivation of enset in poorer households compared to medium (38%) and to richer (23%) households. The food crop diversity, with an average of 6.4 different food crop species on a farm (ranging from 2 to 15 crops), did not vary with the wealth status of the households or with altitude. Enset-derived food items were a main component of multiple daily meals for most households, complemented with other crops produced on the farm. Supplemental food purchases mainly included meat and bread products, although the purchasing power of enset-growing households is predominantly low. The co-staples grown varied with altitude, according to crop productive cultivation boundaries. Maize was an important co-staple observed across the entire investigated altitudinal range. At the mid to upper altitudes, wheat and barley often supplemented or substituted maize as the main cereal crop, while at the mid to lower altitudes, teff was produced in addition to maize. Coffee was the main cash crop grown up to altitudes of 2300 m. Root and tuber crops, and legumes had a more moderate importance in these systems. At lower altitudes, yam, sweet potato and taro were the main roots and tubers produced, which shifted to Irish potatoes at the mid to high altitudes. The importance of beans was higher in several high-altitude kebeles. The food crop diversity, combined with livestock rearing are key for the self-reliance of the small-holder subsistence farms. The need for increased enset cultivation was highlighted by the farmers to ensure food availability and food security with population growth. On the other hand, enset cultivation was mainly threatened by Xanthomonas wilt.

Characterization and Mapping of Soil-Landscape for Site-Specific Soil Management in Ayiba Watershed, Northern Highlands of Ethiopia

The characterization of soil landscapes is becoming increasingly important for making decisions regarding site-specific agriculture systems and soil management. This study was initiated for the purpose of identifying landscape-scale spatial soil variation using a toposequence model so that site-specific fertilization could be achieved. According to the finding, the soils were shallow to very deep in depth, moderately acidic to moderately alkaline in soil reaction, nonsaline in salinity, and clay to sandy loam in texture. The soils were found very low to low levels in most soil nutrients, very low to very high levels of base saturation, and deficient in zinc but have adequate levels of iron, copper, and manganese. The soil exchange complex was mainly dominated by Ca and Mg where the order of occurrence was Ca > mg > K > Na. The CEC values were in high to very high range. Following the field survey and soil analytical results, five main reference soil groups of the World Soil Resource Base—Leptosols (56%), Luvisols (8.5%), Fluvisols (14.4%), Vertisols (13%), and Cambisol (8.2%)—were identified and mapped. Leptosols cover the largest landmass of the watershed and mostly found at the summit and hill back slopes. On the other hand, Luvisols, Fluvisols, Vertisols, and Cambisols were found on the middle and foot slopes. According to the findings, the variation in soil source indicating that topography is the primary pedogenic element in the formation of the soil in the watershed that was under research. Therefore, having local-scale-specific soil information can assist the site-specific application of soil nutrients and amendments based on spatial variability which is tailored to the soil requirements.

Hydrogeochemical processes and groundwater evolution in complex volcanic highlands and alluvio-lacustrine deposits (Upper Blue Nile), Ethiopia.

Lake Tana basin encompasses a wide regional volcanic aquifer system, in the northwestern highlands of Ethiopia. It has significant water resource potential for water supply and irrigation purposes. The objective of this study was to assess the physiochemical characteristics of the surface water-groundwater and investigate the processes controlling groundwater chemistry. A total of 273 water samples were collected from different water points for major ions and stable isotope analysis, representing different physiographic and hydrogeologic regions. Multivariate statistical, graphical methods, saturation and speciation modelling were used jointly to characterize water chemistry and to define hydrogeochemical processes. The Piper plots in combination with cluster analysis and isotope hydrological data indicate that, generally, the groundwater chemistry of the basin can be classified into (1) low TDS Ca-HCO3, Ca-Mg-HCO3, and Ca-Na-Mg-HCO3 type water which is relatively enriched in δ18O-δ2H and depleted in δ13C. These are recharge waters, which are characterized by low rock-water interaction; (2) brackish Mg-Na-Ca-HCO3 type water which is relatively depleted in δ18O-δ2H and enriched in δ13C; and (3) low TDS Na-(Ca)-HCO3 and Na-HCO3 type water which varies from less to more depleted in δ18O-δ2H and is characterized by relatively enriched δ13C. The cross-plots of the major cations vs. HCO3- and stability diagrams show that the primary processes controlling the groundwater evolution in the Lake Tana basin are alumino-silicate weathering and dissolution. Studying the hydrogeochemical characteristics of a complex geologic system with integrated approach helps to understand the complex groundwater flow system and flow dynamics, which in turn helps for proper groundwater utilization and future management.

Livelihood options of landless rural households in Tigrai Region, Northern Ethiopia: evidence from selected districts

BackgroundThe livelihood of rural households in Ethiopia, like in most developing countries, largely depends on land resource. However, nowadays most rural households are denied access to arable land in the highland of Ethiopia due to high population growth and shortage of arable land. Landlessness is, therefore, becoming a serious social and economic problem in the rural highland areas of Ethiopia in general and Tigrai region in particular. This study, therefore, intends to explore the choice of livelihood strategies of landless rural households and assess the challenges and opportunities of the livelihoods of landless rural households in selected districts of Tigrai region.MethodsThis study is conducted in three randomly selected districts of Tigrai region, namely, Kilte-Awlaelo, Degua-Tembien, and Hintalo-Wajerat districts. For the purpose of this study, two Tabias were randomly chosen from each districts. Then, afterward, both primary and secondary data sources were consulted to address the specific objectives of this study. The primary data were collected from 258 randomly selected households and six focus group discussions. This study used Multivariate Probit and Negative Binomial Regression to analyze factors influencing the choice of livelihood strategies and the number of livelihood options adopted by the landless rural households, respectively.ResultsThis study finds that the livelihood sources of the landless rural households in the study area include farm (90%), non-farm (72%), and off-farm (41%) economic activities. The result of the Multivariate Probit regression indicates that household head characteristics, human capital, social capital, physical capital, financial capital, and institution-related factors were significantly influencing the choice of livelihood strategies of the landless rural households. The results of the negative binomial regression model, on the other hand, assert that household head-related factors, social capital, and institution-related factors were significantly influencing the number of livelihood options adopted by the landless rural households. This study affirms that stone or sand selling, dairy farming, poultry production, animal fattening, and bee keeping are the major opportunities to improve the livelihood of the landless rural households. Moreover, this study also identifies that shortage of arable land, youth unemployment, lack of access to infrastructure, poor land administration, and lack of access to financial capital were the major challenges facing the landless rural households.Concluding remarksThis study concludes that all stakeholders efforts to address the problem of landlessness need to be geared to enhance access of landless rural households to different livelihood capitals, such as human, social, financial, physical, and natural capitals. Moreover, rural township and village enterprises could enhance the access of landless rural households to market and job opportunities.

Low Nitrogen Narrows down Phenotypic Diversity in Durum Wheat

Breeding for nitrogen use efficiency has become the major global concern and priority to improve agricultural sustainability. In an attempt to quantify genetic variation and identify traits for optimum and low N environments, 200 durum wheat genotypes were evaluated at three locations in the central highlands of Ethiopia during the 2020 growing season. The experiments were arranged in alpha lattice design with two replications. The results revealed significant differences among genotypes for all studied traits under both N conditions, indicating ample opportunities for genetic improvement. All traits except days to heading and maturity, grain filling period and grain protein content were higher under optimum than under low N. High values of genotypic and phenotypic coefficients of variations, broad sense heritability and genetic advance as percent of the mean were observed for number of fertile tillers and number of seed per spike (NSPS) under optimum, and spike length and NSPS under low N conditions. Cluster analysis classified the durum wheat genotypes into thirteen and eight clusters under optimum and low N, respectively. Principal component analysis detected five and four components which explained 81.29% and 73.63% of the total variations under optimum and N stress conditions, respectively. The present study confirmed the existence of wide genetic variability among the durum wheat genotypes under optimum and low N conditions; and low N lowers the level of diversity. Thus, our study paves the possibility for improvement of durum wheat genotypes through selection and hybridization for increased grain yield and adaptation to N stressed conditions.

Investigating Nitrate with Other Constituents in Groundwater in Two Contrasting Tropical Highland Watersheds

Nitrate is globally the most widespread and widely studied groundwater contaminant. However, few studies have been conducted in sub-Saharan Africa, where the leaching potential is enhanced during the rainy monsoon phase. The few monitoring studies found concentrations over drinking water standards of 10 mg N-NO3− L−1 in the groundwater, the primary water supply in rural communities. Studies on nitrate movement are limited to the volcanic Ethiopian highlands. Therefore, this study aimed to evaluate the transport and fate of nitrate in groundwater and identify processes that control the concentrations. Water table height, nitrate, chloride, ammonium, reduced iron, and three other groundwater constituents were determined monthly in the groundwater in over 30 wells in two contrasting volcanic watersheds over two years in the Ethiopian highlands. The first watershed was Dangishta, with lava intrusion dikes that blocked the subsurface flow in the valley bottom. The water table remained within 3 m of the surface. The second watershed without volcanic barriers was Robit Bata. The water table dropped rapidly within three months of the end of the rain phase and disappeared except near faults. The average nitrate concentration in both watersheds was between 4 and 5 mg N-NO3− L−1. Hydrogeology influenced the transport and fate of nitrogen. In Dangishta, water was blocked by volcanic lava intrusion dikes, and residence time in the aquifer was larger than in Robit Bata. Consequently, nitrate remained high (in several wells, 10 mg N-NO3− L−1) and decreased slowly due to denitrification. In Robit Bata, the water residence time was lower, and peak concentrations were only observed in the month after fertilizer application; otherwise, it was near an average of 4 mg N-NO3− L−1. Nitrate concentrations were predicted using a multiple linear regression model. Hydrology explained the nitrate concentrations in Robit Bata. In Dangishta, biogeochemistry was also significant.

Impact of land use land cover changes on ecosystem service values in the Dire and Legedadi watersheds, central highlands of Ethiopia: Implication for landscape management decision making

Land use land cover change in a landscape is the main driver of degradation in ecosystem goods and services. This study was aimed at analysing the dynamics of the LULC change in the catchments of the water supply reservoirs as well as the impact on the Ecosystem Service Values (ESVs) between 1985 and 2022. The benefit transfer method was used to evaluate ecosystem service value (ESV) changes in response to LULC. The watersheds experienced substantial LULC changes. As a result, the natural vegetation, grasslands, and eucalyptus plantations declined dramatically, while settlements and cultivated lands considerably increased. The global and local ESV estimates show a dramatic decline in ESVs between 1985 and 2022. According to global and local ESV estimates, total ESV in the Legedadi watershed has decreased from approximately US$ 65.8 million in 1985 to approximately US$ 11.9 million in 2022 and from approximately US$ 42.7 million in 1985 to approximately US$ 9.66 million in 2022. According to global and local ESV estimates, total ESV in the Dire watershed decreased from approximately US$ 437 thousand in 1985 to approximately US$ 59 thousand in 2022 and from approximately US$ 225 thousand in 1985 to approximately US$ 36 thousand in 2022. The overall decline in ESV demonstrates that the natural environment is deteriorating as a result of replacement of the natural land cover by other economic land uses. Hence, it is highly recommended that implementing sustainable watershed management practices to halt the dramatic loss of natural ecosystems must be a high priority.

Are farmers’ climate change adaptation strategies understated? Evidence from two communities in Northern Ethiopian Highlands

Research and policy analyses of climate change adaptation in Africa are often centre to examine adjustments in agricultural operations. This mainly bases on a misconception that rural households merely depend on agriculture for their livelihoods. This research aimed at positioning livelihood (farm and non-farm activities) as the centre of climate adaptation strategies to better understand rural households’ adaptation strategic options and capacities, using two rural communities in the Northern highlands of Ethiopia. The result showed that rural households have broader options both in farm and non-farm strategies for combating adverse climate condition than previously reported. A strong and positive association are found between wealth indicators such as farm size (0.08) and productive assets (0.0917) with farm-level adaptation strategies such as short maturing crop and irrigation. Non-farm adaptation strategies (such as business activities and wage employment) are, mainly, influenced by household demographic characteristics such as age of the household head (0.01) and adult household size (0.09). This indicates that there is no specific adaptation strategy panacea for rural households. Rather, rural households use a mix of strategies to meet the particular agro-ecological settings (for farm-level adaptation strategies), and infrastructure and the location of the community, which enable to access market and other services (for non-farm adaptation strategies). Thus, national level climate policies and strategies need to be tailored to address the specific agro-ecology, and infrastructure of the local area and the socio-economic context of the households in the two communities. In this regard, the different levels of government and non-governmental organizations should provide more adaptation measures on agricultural extension services, access to loans, roads, transport, market, knowledge and creation of wage employment and business opportunities in the vicinity of rural communities and its surrounding towns.

Investigating the tensile and flexural strength of sunflower oil treated Ethiopian Highland bamboo fibre reinforced polyester composites

As bamboo composites have wide applications, this study investigated the mechanical properties (tensile and flexural) of oil-treated Ethiopian Highland bamboo fibre/polyester laminated composites using an experimental and analytical approach. The goal of oil treatment is to soften the components of bamboo fibre, resulting in more flexible fibre strands with high tensile and flexural strengths. The composite was manufactured using hand layup methods with a fibre/matrix ratio of 35%/ 65% by volume. The fibre orientations used in the laminates were [0]5 for both tensile and bending tests. The maximum tensile and flexural stresses of oil-treated bamboo fibre-reinforced polyester composite (OBFP) were 193.3 MPa and 173.4 MPa, respectively. These outcomes surpassed untreated bamboo fibre-reinforced polyester composites by 39.6% and 50.2% (UBFP), respectively. The fibre tensile and flexural strains were increased by 25.1% and 25.7%, respectively, as a result of oil treatment. According to the findings, oil-treated bamboo fibre laminates exhibited better tensile and flexural characteristics. The oil treatment lubricated the fibre and increased strand flexibility to reduce abrupt breakage.

Embodying Ethiopia’s Global Golden Age on the Muslim-Christian Frontier: The Allure of Glass Beads

 The period between AD 700 and 1500 has been recently labeled as “Africa’s global Golden Age.” This is particularly true for the Shay communities living on the Muslim-Christian frontier in the ninth to fourteenth century AD. Located in the center of the Ethiopian highlands, the Shay faced the expansion of the Christian kingdoms and the advance of the Muslim polities. In an increasingly violent context of religious conversion and war between the two religious powers, the Shay stressed their independence by burying their deceased in collective structures, contrary to the mortuary practices of both Christians and Muslims, and by including precious local and global grave goods in their tombs. The laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) analysis of 34 glass beads shows how the Shay communities benefited from the Islamic global trade routes at the time, particularly the Middle East, Egypt, and the Indo-Pacific networks. This article examines the crucial role of global glass beads in the construction of a trans-corporeal landscape among the Shay that served the emergence and consolidation of the social self as a collective identity against their Christian and Muslim neighbors.

Physicochemical Characterization of Vermicompost and its Effect on Acidic Soils in Ethiopia

Many parts of the Ethiopian highlands have a problem of acidity which causes the gradual reduction of soil fertility and crop productivity. There has been no research done on the effect of vermicompost (VC) individually or combined with lime and inorganic fertilizers in ameliorating the acidic soils of the country. Hence, the objective of the present study was to characterize the physicochemical properties of VC prepared from different feedstock and to evaluate the effect of VC on selected properties of acidic soil of the site. The study was conducted during 2021 at Yeferzeye kebele and cow manure (CM), enset leaf (EL), potato peels (PP), and paper waste (PW) were utilized to prepare the VC from earthworms (Eisenia fetida). A two-month incubation experiment was also conducted in the green house with four different VC rates (0, 2.5, 5 and 7.5 t ha-1). The highest value of organic carbon (21.44%) and total nitrogen (3.04%) were found in the CM whereas the highest total phosphorus (2794.8 mg kg-1 VC) was recorded from vermicompost made from PW. VC produced from PP substrates had the greatest available Potassium (7286.67 mg kg-1 VC). The highest VC rate (7.5 t ha-1) elevated the pH of the PW from 4.94 to 5.48. Similarly, the highest content of OM (3.2%) was produced in EL, (3.21%) in PP and (3.25%) in PW at the highest rate. The highest increase in total N (0.25%) was also recorded in EL at the highest rate and the lowest was recorded (0.18%) in CM and EL at the control. The available P of the soil varied from 1.78–24.33 mg kg−1 after incubation. The highest available K (1360 mg kg-1) was obtained when the rate of 7.5 t ha−1 were applied with PP compared to the control. Hence, the findings showed that applying VC to the acidic soil can improve soil fertility and increase crop nutrient availability.

Determinants of Teff Production in North Showa Zone, Central Highlands of Ethiopia

Using primary data collected from 115 households of North Showa Zone, Ethiopia, the study examined determinants of Teff Production. In order to investigate the effect of each predictor variable on the household teff production level a bivariate analysis was performed. Among the econometric method of analysis, a logistic regression model was fitted to analyze the potential variables affecting household teff production level in the study area. The result of the descriptive analysis revealed that about 85 (73.90%) were teff producers while 30 (26.10%) of the households were found to be non-producer. Moreover, the logistic regression model estimates that among the nine variables included in the logistic model, eight of them were significant at different probability level (1, 5, and 10). These are the education of household head, total cultivated land for teff production per hectare, number of oxen, technology adoption, access of extension services received by households, sex, fertilizer application and kind of teff variety used. Finally, improving land quality, creating awareness towards importance of farm technology adoption, and providing frequent extension service were recommended.

Assessment of the effects of land use/cover changes on soil loss and sediment export in the Tul Watershed, Northwest Ethiopia using the RUSLE and InVEST models

ABSTRACT Numerous studies found that the main factor contributing to the export of sediment from the Ethiopian highlands is soil erosion, which is related to the expansion of cultivated land at the expense of steep slopes of natural vegetation covers. Plantation practices on steep slopes of bare surfaces and utilizing effective water and soil conservation measures on cultivated lands, may, however, have an impact on the rate of soil loss and the sediment yield ratio. Thus, the main objective of the research was to determine how changes in land use and land cover introduced by soil conservation affected the spatiotemporal variability in soil loss and sediment delivery ratio. RUSLE, InVEST, and integrated GIS technology were used to quantify the study's results. The expansion of farmed land at the expense of natural forests, woodlands, shrubs, and grasslands between 1990 and 2000 resulted in a significant increase in soil loss and sediment yield. This was mostly seen where natural vegetation cover areas on steep slopes were turned into cultivable land. Watershed development interventions significantly decreased both the mean annual soil loss and sediment yields between 2003 and 2021. For instance, from 2010 to 2021, the mean annual soil loss in the watershed dropped by 23.5 t ha−1 and the sediment export declined by 6.13 t ha−1yr−1. To prevent soil loss and sediment export at the extensive level, it is therefore concluded that sustainable soil management on cultivated land and plantation techniques on community land should be expanded up to the adjacent watersheds.