Research & reports

Rogers Hansine, Christine Bonnin, Inês Raimundo, Madal Artur, Cândida Bila · Revista Tamoios · Mozambique

The SYNERGI project, implemented from March 2023 to September 2025, aimed to promote urban community involvement in co-creating Socially Inclusive Edible Urban Green Infrastructure (IVUCs) in Maputo and Xai-Xai, Mozambique. The project successfully established IVUCs in six selected schools, increasing food production and educational opportunities. The project highlights the need for better institutional frameworks to support green infrastructure development.

F. I. Alagbe, B. J. Adewumi, Mathew Dayomi, O. A. Ibitoye · Zenodo (CERN European Organization for Nuclear Research) · Nigeria (Lagos)

This study investigated the integration of biophilic design and productive green infrastructure (PGI) in mixed-use developments on Lagos Island, Nigeria, as an urban renewal strategy. Data from 303 architects, urban planners, and real estate developers revealed that while ecological regeneration opportunities exist, the area faces limitations from high density and inadequate infrastructure. Respondents showed moderate to high awareness of biophilic principles, and PGI incorporation was linked to perceived gains in social interaction, biodiversity, and economic value.

Dominik Bittner, Joanne U Smith, Georgios Leontidis, Grant Campbell, Jeanne Biegel, Pete Smith, Matthias Kuhnert, Rastislav Skalský, Licida M. Maria Giuliani, Abdul Walid Walid Salik, Paul Hallett, D Burslem, Getahun Yakob, Wolde Mekuria, Euan Phimister, Amare Haileslassie, Desalegn Tegegne, sarem norouzi, Heyu Chen, Cecile Gubry-Rangin, Adnan Khan · Environmental Research Letters · Sub-Saharan Africa

A narrative review examines tools for assessing soil health and Nature-based Solutions (NbS) for soil quality in sub-Saharan Africa, drawing primarily on examples from Ethiopia but intended for farmers and advisors across the region and other developing countries. It reviews physical, biological, chemical, functional, and service-related soil tests, noting that science-based tests require expertise, equipment, and cost, while locally-derived tests are affordable and readily applicable. NbS practices are assessed against labor, cost, and crop-production factors, and the review concludes there is no single universally applicable practice — suitability depends on farmers' priorities and circumstances. It also examines predictive methods, including mechanistic soil models, AI, and hybrid approaches combining data, physics, and knowledge such as digital soil mapping.

Macharia M.W., Caproni L., Solemanegy M., Takele R., Chiulele R.M., Munisse P., Amane M., Pè M.E., Buizza R., Dell'Acqua M. · Communications Biology 8:834 · Africa

Genotypes 389 cowpea accessions (mostly landraces) from Southern Africa and identifies 36 genomic loci linked to local climate adaptation, highlighting the breeding value of farmer-conserved resources.

African Urban Gardening Research Network · National Center for Biotechnology Information (NCBI/PMC) · Sub-Saharan Africa

Systematic review of 47 peer-reviewed studies across sub-Saharan Africa (2000–2025) showing urban gardens support ecological functions including pollination, soil fertility, and microclimate regulation.

Solomon Asamoah, Henry Mensah, Eric Kwame Simpeh, Eric Oduro-Ofori, Sandra Serwaa Boateng, Sarah Boateng, Listowel Koda Frimpong, Priscilla Okyere · Green Technologies and Sustainability · Africa

This scoping review examined the role of nature-based solutions (NbS) in addressing food insecurity in Africa, using bibliometric and thematic analysis of peer-reviewed literature. The study identified agroforestry, urban agriculture, and wetland restoration as NbS components. However, it found that a comprehensive understanding of NbS efficacy, challenges, and implications for food insecurity in Africa remains limited, with existing research primarily focusing on localized interventions rather than broader trends.

Mahacla Odongo, Caleb Mireri, Peter Mwangi · Environmental Technology and Science Journal · Kenya (Nairobi)

The Nairobi River riparian reserve in Kenya has undergone immense land use and land cover changes over the past 20 years due to urban development. A survey of 650 respondents revealed that urban agricultural activities dominated the upper segment at 69%, commercial ventures constituted 79% of the middle segment, and residential usage comprised 89% in the lower segment. These activities caused significant degradation from crop cultivation of river slopes, pollution infiltration, and loss of biodiversity, indicating a severe depletion of the riparian space's functions.

Rueda, Ximena · Socio-Environmental Systems Modeling · Africa

A 2025 comparative analysis examines agricultural, economic, and biodiversity policy across Cameroon, Kenya, and Colombia in the context of agricultural expansion, using discourse analysis of policy documents via the Nature Futures Framework and Life Frames Framework, an evaluation of budgets allocated to major agricultural and biodiversity policies, and stakeholder interviews. It finds a shared struggle across all three countries to harmonize agricultural development with biodiversity conservation despite differing institutional capacities, historical pathways, and sociocultural contexts, with agriculture continuing to dominate policy agendas and resource allocation even as recognition of biodiversity's importance grows. Nature is framed primarily in instrumental terms, most strongly so in Colombia's utilitarian "Nature for Society" orientation, with intrinsic and relational values rooted in Indigenous cosmologies weakly reflected in implementation; funding for biodiversity-related ministries remains minimal relative to agriculture in all three countries — Kenya's environmental budget rarely exceeds 0.3% of national expenditure, with Cameroon showing similar disparities and Colombia's allocations continuing to favor agricultural expansion — and institutional fragmentation further undermines this governance.

Mwangi Kamau, Wanjiku Otieno · International Journal of Veterinary Sciences and Animal Husbandry · Kenya

This study characterized the physicochemical quality of untreated wastewater from three small-scale slaughterhouses on the outskirts of Nairobi, Kenya, and measured its effect on soil microbiology at 0, 50, and 200 meters from the discharge point during both wet and dry seasons. Wastewater biochemical oxygen demand (BOD5) ranged from 1,840 to 2,620 mg/L and chemical oxygen demand (COD) from 3,410 to 4,870 mg/L, exceeding Kenyan discharge standards by 6- to 10-fold. Total bacterial counts in soil at the discharge point were 2.7 times higher than at 200 m (p<0.001), and total coliform counts were 4.1 times higher (p<0.001). The Shannon-Wiener diversity index rose significantly with distance from the discharge point (1.42±0.14 at 0 m vs. 2.34±0.18 at 200 m; p<0.001), indicating that wastewater irrigation selects for a less diverse, coliform-dominated soil microbial community. Seasonal variation was significant for BOD5 and coliform loading but not for the diversity index.

Ibukun Balogun, James S. Pryke, Temitope Kehinde, Michael J. Samways · Landscape and Urban Planning · Africa

A 2025 study investigated how insect pollinator diversity differs between gardens, agricultural areas and natural areas within a southern African urban mosaic composed of an urban core, farms and natural areas, and examined how urban green spaces influence pollinator taxonomic diversity. Direct observation and pan traps were used to assess pollinator diversity alongside measured environmental, floral and landscape variables. Results showed similar pollinator diversity between agricultural and natural areas for some taxa, and between agricultural areas and urban gardens for other taxa. Floral variables were the most important predictors of pollinators, with greater floral diversity ameliorating the effects of urbanization and agricultural intensification, while landscape context was significant but less important. Although results varied considerably among taxa, the findings suggest agroecological farming may buffer natural areas from urbanization effects and reduce urbanization's impact on pollinators in urban gardens by providing needed resources. The study identifies floral variables as important for urban green planning, achievable through establishing more flowering plants in human-modified areas such as semi-urban agricultural areas and urban gardens.

Ermias Debie · City and Environment Interactions · Ethiopia

A study in Bahir Dar, Ethiopia examined the integration of urban agriculture (UA) and green infrastructure (GI) through surveys and interviews with 99 stakeholders, supplemented by participatory observation. The main barriers to integration, based on multiple-response data, were a lack of supportive policies and regulatory frameworks (87%), limited awareness (57%), and space constraints (51%). Multicriteria decision analysis ranked integrated practices as the most effective strategy (score 16.81), followed by edible tree planting at garden centers (16.18), small gardens (13.83), and fence-edge greening (11.46). Structural equation modeling identified thermal regulation and access to fresh food as critical factors for planning sustainable urban systems.

Jeffrey Chiwuikem Chiaka, Gengyuan Liu, Hui Li, Wen Zhang, Mingwan Wu, Zhaoman Huo, F. Gonella · Environmental and Sustainability Indicators · Sub-Saharan Africa

This study evaluated land cover change and its drivers using spatial and statistical analysis in 22 designated protected areas (PAs) across the tropical coastal regions of sub-Saharan Africa. Results indicated that food production is prevalent in these protected areas regardless of their designation, and forest loss occurred in most PAs, suggesting weak conservation. Population density was the most significant driver of land cover change, and only 15 out of 22 protected areas showed an increase in their total ecosystem service value.

Fedila Chumgicho · National Academic Digital Repository of Ethiopia · Ethiopia

This descriptive study assessed the impacts of urban agriculture on the environment in Tora town, Silte Zone, Central Ethiopia, using a mixed-methods approach with 204 systematically selected samples and 10 purposively selected key informants. Findings revealed that 41.2% of urban residential households were engaged in farming. The study underscored positive impacts such as sustainable waste management, organic waste utilization, and the adoption of sustainable agricultural techniques, while also identifying challenges like water-related issues and sustainable waste disposal.

Tinashe P. Kanosvamhira · Urban Forum · South Africa

This narrative literature review analyzed 62 peer-reviewed articles on urban agriculture in South Africa from 1993 to 2022. The findings indicate several knowledge gaps, including an under-representation of secondary cities and a general productivist focus in most studies, which limit understanding of urban agriculture for sustainable cities.

Dilebo T., Feyissa T., Asfaw Z., Zewdu A. · Journal of Ethnobiology and Ethnomedicine 18:74 · Ethiopia

An ethnobotanical survey of 240 households across four zones of southern Ethiopia documenting on-farm landrace diversity, use patterns and farmer conservation of the staple crop enset.

Mulesa T.H. · The Journal of World Intellectual Property · Ethiopia

A historical institutional analysis of the governance of access to plant genetic resources in Ethiopia, examining national policy evolution in relation to the ITPGRFA, benefit-sharing, and farmers' rights.

Eliana Camargo Nino, Sam R. Lane, Kanako Okano, Irvanu Rahman, Bo Peng, Hannah Benn, Christina Culwick Fatti, Gillian Maree, Samkelisiwe Khanyile, Carla-Leanne Washbourne · Occasional paper · South Africa

This paper aimed to understand urban agriculture within the green infrastructure network in the City of Johannesburg, South Africa, and identify ecosystem services delivered by maintaining and investing in these assets. A multi-method approach was used to identify interlinkages between urban agriculture and social, economic, and environmental systems, validate them with stakeholder input, and visualize them through spatial analysis of food gardens. Urban agriculture was shown to enhance food security, provide economic opportunities, and strengthen ecosystem services such as climate change mitigation and disaster resilience.

Jacques L du Plessis, Ashley J Knox, HE Jacobs · Water SA · South Africa

Using spatial data on 1,813 gated-community homes across different regions of South Africa, this study quantitatively evaluated garden footprint area as a percentage of total plot area. Analyzing data from 11 gated communities, it found the average garden footprint to be 36% of total plot area. Homes with a garden area under 100 m² showed limited influence on monthly water consumption, while water use in homes with a larger garden footprint increased proportionally with garden size, and seasonal fluctuations in water use reflected garden irrigation and other outdoor water use.

Aurillia Manjella, Alessandra Grasso, Victor W. Wasike · · Africa

A report on the Biodiversity for Food and Nutrition project in Busia county, western Kenya, describes school gardens that supply or complement school feeding programmes as a practice for mobilizing biodiversity and improving dietary diversity among schoolchildren. Kenya is said to have more than 200 African leafy vegetables (ALVs), and the project gives children opportunities to acquire agricultural skills focused on cultivating nutrient-rich ALVs; the report notes that school gardening has long been part of education in Kenya, especially in rural areas dating to colonial times.

Joyce-Ann Syhre, Meike Brückner · · Kenya (Nairobi)

This chapter illustrates agricultural alternatives in Nairobi, Kenya, emerging through practiced urban agriculture. These alternatives enable socio-ecological spaces of food sovereignty, biodiversity, and agency. The chapter discusses the socio-cultural values of farming and food, the role of gender in Nairobi's urban agricultural landscape, and the diverse perceptions of human-nature relations among female farmers.

Céline Veríssimo, Leo Name · · Africa

This essay by Veríssimo and Name examines community practices of edible landscaping in outdoor domestic spaces in the city of Dondo, Mozambique, framing them as a form of quiet resistance to marginalization and as a means of household-community empowerment; the authors argue these diversified spaces support food sovereignty and call on landscape architects to draw on this knowledge, which they say is typically disregarded by professional practice.

Kh. N. Shaaban, M. Abul-Soud, OSAMA A. EL-BEHAIRY · Journal of Environmental Science · Africa

On the rooftop of the Central Laboratory for Agriculture Climate, Agriculture Research Centre, Egypt, tomato was grown over two summer seasons and strawberry over two winter seasons during 2014-2015 to test vermicompost-perlite substrate mixes (10%, 20%, 30% vermicompost, and a perlite-only control) combined with chemical, vermi-liquid, or combined nutrient solutions. Vegetative growth, yield and leaf N/P/K content were highest with chemical or combined chemical/vermi-liquid solution paired with the 30% then 20% vermicompost mixes, and applying or increasing vermicompost reduced heavy metal content in the tomato and strawberry fruit.

Gudrun B. Keding, Céline Termote, Katja Kehlenbeck · · Kenya

Trees offer multiple benefits to urban agriculture, providing both production and service functions, and their integration into urban gardens enhances efficient resource use. In Kenya, traditional leafy vegetables were often replaced by introduced varieties, though producing perishable goods close to urban markets offers advantages. However, commercial production may lead to the dominance of exotic species and loss of indigenous ones. Urban gardens supported abundant and diverse wild flora, comparable to unmanaged plots. Rapidly growing urban populations seek food, income improvement, and cultural retention.

Fentahun Mengistu, Mulugeta Alemayehu · Ethiopian journal of agricultural sciences · Ethiopia

A 2017 study of homegardens in Bahir Dar City, Ethiopia, based on interviews with 178 households across 7 sub-cities and 12 former kebeles, plus an inventory of fruit species and other higher plant and livestock species. It identified 58 higher plant species of various uses in the gardens: 17 fruit species (28.8%), 12 miscellaneous-use species (20%), 11 vegetable species (18.6%), 11 medicinal species (18.6%), and 8 spice/condiment species (13.6%); the most abundant perennial species were mango (20.8%), guava (13.4%), avocado (11.6%), papaya (11.2%), and Persian lilac (9.9%). It reports that the city gardens offer a distinctive opportunity for preserving medicinal and aromatic plants, while gardens in the outer city showed competition and substitution between horticultural crops and khat (chat).

S. A. Materechera · African Journal of Agricultural Research · Africa

A study of soil salinity in irrigated fields used for urban agriculture in a semi-arid region of South Africa. It compares sodium levels (19.3 vs. 9.8), pH (7.13 vs. 6.3) and electrical conductivity ECe (22.1 vs. 7.9 dS/m) between topsoil and subsoil layers, finding that calcium, magnesium and potassium (unlike sodium) were higher in the top than the subsoil layer, while pH and ECe did not differ significantly by depth overall. By irrigation method, basin irrigation produced the highest accumulation of calcium, magnesium, potassium and sodium, followed by drip and then sprinkler irrigation, with the same ranking (basin > drip > sprinkler > control) for pH and ECe; sprinkler irrigation was the only method showing higher pH and ECe at 10-20 cm depth than at 0-10 cm. The study concludes that irrigation is increasing soil salinity and points to the need for sound irrigation water management, particularly appropriate irrigation scheduling.