Research & reports

Karen Botes, Christina Breed · Acta Structilia · South Africa

This article reviewed three edible living wall case studies in Gauteng, South Africa, focusing on system resilience, economic feasibility, and edible plant possibilities. Interviews were conducted with clients, contractors, and designers. Findings suggested indirect commercial value through customer experience and educational value, but indicated that economic feasibility and resilience need enhancement for improved urban food production.

Anthony Kamara, Foday Thullah · Journal of Nuclear Technologyin Applied Science (JNTAS) /Journal of Nuclear Technologyin Applied Science (JNTAS) · Africa

A study measured background radiation at the two major dumpsites in Freetown, Sierra Leone — Kingtom and Granville Brooke — which are also used for urban agriculture and where youths scavenge scrap metals and plastics daily. Using a portable Radiagem survey meter and GPS, researchers took 10 in-situ dose-rate measurements at each site. The mean equivalent dose rate was 0.8 mSv/year at Kingtom and 1.1 mSv/year at Granville Brooke; Kingtom slightly exceeded the UNSCEAR permissible limit but stayed below the ICRP limit, while Granville Brooke exceeded both the UNSCEAR and ICRP limits. The study concludes both dumpsites could become unsafe in the near future from cumulative radiation exposure for workers, scavengers and other exposed individuals.

Samuel Ziem Bonye, Gordon Yenglier Yiridomoh, Emmanuel Kanchebe Derbile · International Journal of Urban Sustainable Development · Africa

A mixed-methods study in Wa Municipality, Ghana, examined how peri-urban agricultural land use change affected farmers' food security, surveying 235 smallholder farmers with questionnaires, interviews and GIS-based historical data. Over the past three decades, peri-urban agricultural land was drastically lost to residential and infrastructural development, and this land use change resulted in food insecurity, with most smallholder farmers unable to meet their food needs over the past decade.

Bereket Geberselassie Assa · Civil and environmental research · Ethiopia

A study of Wolayta Zone Sodo Zuria Woreda in southern Ethiopia used GIS and remote sensing to analyze how human intervention affects the agricultural system. It found that urbanization driven by demand for residential land, a 2.66% increase over nine years, has produced food insecurity and raised crop production costs in local markets. Forestland declined at a rate of 0.295% per year, of which 0.09% was converted to residential land. Land use classification from 30 m Landsat 7 imagery was evaluated using the Analytic Hierarchy Process with a consistency ratio of 0.016%, and the study notes that the impact of deforestation on urban agriculture and livelihoods in this part of southern Ethiopia's highlands had not previously been scientifically studied.

Joshua Jonah Kunda, Ahmed Abubakar Jajere, E. A. Otabe, Chindo Musa Muhammed, Umar Muhammed Bibi, Yusuf Maina-Bukar · Environment and Pollution · Nigeria

This study in Makurdi, Benue State, Nigeria, used geospatial technology to assess agricultural land vulnerability to flooding, deriving factor weights (rainfall 25%, elevation 22%, slope 20%, drainage density 13%, land use/cover 12%, soil type 8%) through pairwise Analytical Hierarchy Process comparison (consistency ratio 0.078) and a weighted overlay model in ArcGIS 10.4. Farmland along the floodplains of the River Benue fell within the very highly vulnerable category, with elements at risk totaling 537.6 units of farmland (66.1%), 40.5 units of irrigation land (5.0%), and 125.8 units of built-up land (15.5%).

Elizelle Juaneé Cilliers, Louis Lategan, Sarel S. Cilliers, Karla Stander · Frontiers in Sustainable Cities · South Africa

This paper investigates urban agriculture (UA) in South Africa as a citizen-led urban greening strategy, reviewing case studies and the national policy framework. Key limitations include many UA initiatives not being self-sustaining or fully citizen-driven, a cultural stigma, limited national support due to the absence of a dedicated UA policy, and South African spatial planners' limited knowledge of UA. These issues hinder the broader implementation of UA.

Julia Davies, Corrie Hannah, Zack Guido, Andrew Zimmer, Laura E. McCann, Jane Battersby, Tom Evans · Food Policy · Sub-Saharan Africa

This study investigated the association between urban agriculture (UA) and household food security in smaller African cities and towns, using survey data from 2,687 low- and low-middle income households in 18 urban areas with populations of less than 200,000 across Zambia and Kenya. The analysis found that 33% of households in the sample engaged in UA, but there was limited statistical significance in the relationship between UA and household food security. Key barriers identified were settlement formality, property rights, and distance from food retailers.

Nicole Paganini, Stefanie Lemke · Local Environment · South Africa (Cape Town)

This study, conducted from 2017 to 2019 in Cape Town, South Africa, and Maputo, Mozambique, explored urban agriculture's contributions to livelihoods and food availability through a food justice lens. In Cape Town, NGO-led urban agriculture regulated production and market access, serving wealthy consumers, with only 15% of farmers consuming their produce. In Maputo, urban agriculture contributed to local food availability, with 99% of farmers eating their produce, but farmers depended on intermediary-determined prices and faced unequal access to inputs. The study revealed stark structural inequalities and uneven power dynamics in both contexts.

Harry Kasumba, M. Mashologu, Patrick W Bwowe · · South Africa

An investigation into the sustainability of school food gardens in Chris Hani District, South Africa, used a mixed-methods approach with a purposive sample of six schools. Findings revealed significant bottlenecks hindering sustainability, specifically inadequate funding and a lack of proper planning for school food gardening activities.

Tony Ngwenya, Pfano Mashau · Problems and Perspectives in Management · South Africa (Durban)

This study investigated institutional support for youth-owned Small, Medium, and Micro-Enterprises (SMMEs) in Durban's urban agribusiness sector using a quantitative methodology. Findings indicated that CSR interventions had not yielded a fundamental impact, and there was a lack of tangible, result-driven institutional support from policymakers and authorities. Furthermore, targeted technological transfer was a constraining factor, and a lack of monetary and non-monetary access hampered the SMMEs' competitiveness and profitability.

Mulugeta Chane Wube · RePEc: Research Papers in Economics · Ethiopia

A descriptive study analyzed the effect of industry extension service packages on the performance of Micro and Small Enterprises (MSEs) in Dessie, South Wollo, and Oromia Special zones, Ethiopia, sampling 248 out of 646 MSEs. The analysis revealed that industry extension services provided by TVET trainers were inadequate across all four dimensions: technical, technology, Kaizen, and entrepreneurship. The overall performance of the surveyed MSEs was found to be very low, concluding that the provided extension services were insufficient in improving their performance.

Dauda Rotimi Awoniran, Omotayo Ben Olugbamila, Emmanuel Olufemi Omisore · Analele Universităţii din Oradea Seria Geografie · Sub-Saharan Africa (Lagos)

This study examined urban agriculture practices and land use changes in Lagos Metropolis, Sub-Saharan Africa, over three decades using satellite imagery and primary data from four Local Government Areas. It found that cultivated lands decreased by 28.70% between 1986 and 2000, and by 19.25% between 2000 and 2016. Urban farmlands converted to other uses by 89.48% between 1986 and 2000, and by 75.64% between 2000 and 2016, indicating that food security is under threat as land for urban farmers shrinks.

Mawuna Donald Houessou, Mirte van de Louw, B.G.J.S. Sonneveld · Sustainability · Benin

To identify the main constraints to the expansion of urban agriculture (UA) in Benin, a systematic literature review, a survey among experienced urban gardeners, and in-depth interviews with stakeholders were conducted. The synthesis revealed five predominant constraints: lack of land and tenure insecurity, insufficient government support, restricted market access, limited access to productive factors, and inequality issues. Specifically, the survey indicated a political unwillingness, which was explained by the unperceived benefits of investing in UA and the lack of enforcement of urban development plans.

Idris Mohammed, Abdella Kosa, Nuredin Juhar · Agricultural and Food Economics · Ethiopia

This study assessed the economic linkage between urban development and the livelihood of peri-urban farming communities in Ethiopia, focusing on current practices and policies. Data was collected from 30 municipal officials and 200 evicted peri-urban farmers across five municipalities in the Amara regional state. Findings indicate that the continuous eviction of peri-urban farmers from their indigenous land for redevelopment negatively affects their livelihood, highlighting significant equity issues. Factors contributing to urban expansion include economic policy reform, private investor incentives, and public sector projects, further exacerbated by policy limitations and lack of municipal intervention.

Brittany Kesselman, Mvuselelo Ngcoya, Daniela Casale · Agroecology and Sustainable Food Systems · South Africa

This paper, based on research from two urban gardens in Johannesburg, South Africa, argues that contemporary urban dietary norms pose a challenge to urban agroecology. The dietary norms and practices of Johannesburg residents are poorly aligned with the production requirements and outputs of urban agroecology. Lessons from other countries suggest that the benefits of agroecology could be enhanced by targeting changes in food preparation and consumption practices.

Sileshi Azagew, Hailu Worku · ENVIRONMENTAL SYSTEMS RESEARCH · Ethiopia (Addis-Ababa)

This study assessed the status, accessibility, and constraints of urban green infrastructure (UGI) in Addis Ababa, Ethiopia. It revealed that UGI land use decreased by 9.2% from 2003 to 2016, with urban agriculture declining by 11.9%. City residents lack sufficient recreational UGI, with park per capita at a very small 0.37 m² compared to Ethiopian standards of 15 m², and over 90% of the population lacking access to existing parks within walking distance. Major constraints identified include weak implementation of development plans, density, built-up area expansion, and lack of priority for UGI development.

Amélie Robert, Jean Louis Yengué, A. Fanny, Mikael Motelica‐Heino, Edmond Hien, Alain Sanou · Risco Revista de Pesquisa em Arquitetura e Urbanismo (Online) · Africa

This research, conducted in Ouagadougou, Burkina Faso, utilized in situ observations, interviews with farmers and decision-makers, and an analysis of planning documents. It found that urban agriculture has experienced a significant increase in surface area and is popular among city residents. However, it is not officially considered in urban planning, revealing divergences in viewpoints between farmers and public decision-makers.

Derek Du Bruyn, Marietjie Oelofse · New Contree · South Africa (Bloemfontein)

This article investigates the Bloemfontein Municipality's efforts to establish Batho, a new location for black and coloured people (ca. 1918-1939), as a 'garden location' within the historical context of British-style urban planning and racist, segregationist policies. Initiatives included securing water supply, allocating allotment gardens, providing a fresh-produce market, and planting trees. While some motivations were aesthetic, others were deeply rooted in segregationist ideology. The article critically assesses whether these attempts to create a garden location were 'successful'.

Reuben Nwoye Okechi, Edna Ifeoma Chukwura, Christian Okechukwu Nweke · Journal of Advances in Microbiology · Nigeria (Owerri)

This study, conducted in Owerri, Nigeria from June to December 2019, evaluated the interactive toxic effects of ternary mixtures of sodium dodecyl sulfate (SDS) and divalent metals on Serratia marcescens (SerEW01) from the Otamiri River, a source for urban farming. The study found that both concentration addition (CA) and independent action (IA) models predicted lower toxicities compared to experimentally observed data. The Toxic Index and Model Deviation Ratio indicated a synergistic interaction of SDS and metal ions, resulting in higher combined toxicities than predicted, posing environmental hazards due to co-contamination.

Amsalu Woldie Yalew · Regional Economic Development Research · Ethiopia

This paper provides an overview of urban agriculture in Ethiopia, synthesizing existing evidence on its role in the overall agricultural sector, urban economy, and urban employment, based on official reports and statistical surveys. Despite scant evidence, urban agriculture shows considerable contributions. However, the review reveals existing gaps in institutional and policy support for urban agriculture.

Hillary A. Craddock, Elisabeth Fost Maring, Stephanie Grutzmacher · African Journal of Food Agriculture Nutrition and Development · Ethiopia

A mixed-methods pilot survey of 21 teachers and parents in Debre Berhan, Ethiopia, investigated household agricultural practices to understand foodborne illness risks. The study found that half of respondents using manure applied uncomposted manure as fertilizer, and many kept multiple animal species. This suggests a high risk of pathogen exposure for children and adults through contact with uncomposted manure and animals.

Murtah Shannon, Kei Otsuki, Annelies Zoomers, Mayke Kaag · Urban Studies · Mozambique (Beira)

This article examines the implications of global interventionism in African cities for existing claims to urban space, particularly those of farmers, using Beira, Mozambique, as a case study. A historical-political analysis demonstrates that urban farming has been a distinct feature of Beira's urbanism amidst successive and contradictory state-land regimes. A new urban regime, formed by municipal leaders and international donors, aims to erase urban agriculture from the city through urban 'development', indicating a need for better understanding of manifold claims to urban space beyond slum urbanism.

F. Waswa, M. Mwamburi, I. I. C. Wakindiki, Roseline Chemutai · Journal of applied science and environmental management · Kenya

This study focused on soil physicochemical properties and fertility management in Ruiru Sub County, a peri-urban area in Kiambu County, Kenya. Soil samples from ten small contact farms (~0.1 ha) were analyzed, revealing that most farmers were tenants growing leafy vegetables, maintaining soil fertility with organic manures, and performing tillage by hand. These practices signal limitations imposed by small farm size and lack of land ownership, with soil fertility primarily limited by the interaction of soil pH, K, and Ca.

Mary Njoki Mwaura, Sabina Wangia, Japheth Ododa Origa, Lee Ernest Mbatia Oliver · Journal of Agricultural Extension · Kenya (Nairobi)

This study investigated the influence of urban extension workers' socio-economic characteristics on farmer empowerment in Nairobi County, Kenya, using data from 64 extension workers. While extension workers' characteristics positively influenced the choice of extension methods, explaining 37.2% of farmer empowerment, a significant finding was that 49.9% of extension workers were unaware of adult learning principles (ALPs). The study recommends training extension workers in ALPs and ICT techniques to improve extension methods.

Oso Adeola Abiola · Zenodo (CERN European Organization for Nuclear Research) · South Africa

This review discusses vegetable production in South Africa, focusing on the impacts of root-knot nematodes (Meloidogyne species) on small-scale farming communities. The review highlights that these nematodes are a primary pest, causing delayed crop maturity, reduced yields, poor quality produce, and escalating production costs. This leads to substantial income losses for farmers and the abandonment of community gardens, intensifying challenges for vegetable production and food security.