Research & reports
Peer-reviewed research and reports on community urban agriculture, food education, composting, welfare and more.
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Heavy metal accumulation in Amaranthus hybridus and Ocimum gratissimum cultivated on automobile workshop soils in Ekiti Nigeria and associated human health risks
2026Amos Tomiwa Afolabi, Bridget O. Odiyi, Oluwasheun Johannah Ojeniyi · Discover Soil. · Nigeria (Ado-Ekiti)
A study in Ado-Ekiti, Nigeria, investigated heavy metal accumulation in Amaranthus hybridus and Ocimum gratissimum grown on soils from two automobile workshops. A. hybridus accumulated higher metal concentrations than O. gratissimum, with stems showing greater accumulation than leaves. While non-carcinogenic and total cancer risks were within acceptable limits, children showed higher vulnerability, indicating that continuous monitoring and soil remediation are essential for sustainable urban agriculture in these contaminated areas.
Contamination & food safetyHealthA scoping review of the impact of urbanization on food security in Sub-Saharan Africa
2026Alemseged Gerezgiher Hailu, daniel girmay, samuel ataklti · Discover Food · Sub-Saharan Africa
This scoping review analyzed 155 sources (2009–2024) on urbanization's impact on food security in Sub-Saharan Africa. Findings showed rapid urban expansion converted 30% of peri-urban agricultural land in some regions, increasing dependence on imported staples, and low-income households spend 60–80% of income on food. A policy gap was identified, with only 12% of countries having supportive policies and 19% of cities designating land for farming.
Environmental trade-offsFood sovereignty & justiceEconomicsPeri-urban agricultureClimate changeHealthUrban Agriculture Policy and Household Food Security in Jos Metropolis, Nigeria
2026N. I. Odeh, A. T. OGAH, O. C. Odeh · Journal of African Resilience and Advancement Research · Nigeria
This study in Jos Metropolis, Nigeria, examined the urban agriculture (UA) policy framework and household food security using mixed methods, including interviews and a household survey. Findings revealed the absence of a dedicated UA policy, with UA regulated indirectly by general agricultural and land-use policies. Only 20.7% of households were food secure, while 79.3% experienced some level of food insecurity.
Governance failurePolicyFood sovereignty & justiceHealthEconomicsPlastic debris facilitates the survival of multidrug-resistant bacterial pathogens in an urban agricultural environment
2026Michael J. Ormsby, Luke Woodford, James Joseph Mwesiga, Winnie Ernest, Dativa J. Shilla, Daniel Abel Shilla, Richard S. Quilliam · Environmental Pollution · Africa
This study investigated plastic debris as a reservoir for multidrug-resistant (MDR) enteric bacterial pathogens at two peri-urban agricultural sites in Dar es Salaam, Tanzania. Analysis of 140 environmental samples (soil, water, vegetation, plastic debris) showed higher concentrations of culturable pathogens on plastic debris, with presumptive E. coli loads of ~1 × 10^3 CFU per piece. Plastic debris harbored a greater proportion of MDR strains, including E. coli and K. pneumoniae resistant to critically important antimicrobials, indicating that plastic waste facilitates the survival of MDR pathogens and poses health risks.
Contamination & food safetyHealthFood sovereignty & justicePeri-urban agricultureAssessment of Municipal Solid Waste Compost Used In Urban Agriculture and Its’ Potential Public Health Impacts In Katsina City, Nigeria.
2025Aminu Zakariyau, Murtala Rabiu · International Journal of Advances in Engineering and Management · Nigeria (Katsina City)
The potential ecotoxicological impacts of municipal solid waste compost (MSWC) on soil, plants, and humans in urban Katsina, Nigeria, were assessed. Analysis of soil mixtures and plant biomass (maize and beans) revealed high phytotoxicity in beans, while maize considered MSWC as phytonutrients. No statistical difference in non-biodegradable substance concentrations in soils and plants was found, and ecological risk index (ERI) indicated low risk; however, Target Hazard Quotients (THQ) suggested a likelihood of non-carcinogenic effects to the ecosystem.
Contamination & food safetyCompostHealthOrganic cycleUncontrolled urban vegetable farming poses public health risks in Ethiopia
2025Taffere Addis, Sisay Ketema, Abayneh Melaku · Frontiers in Water · Ethiopia (Addis Ababa)
This study in Addis Ababa, Ethiopia, investigated trace metal levels in sediment, soil, and irrigated vegetables from farms along the Akaki River, evaluating public health risks. Sediment levels of arsenic, chromium, copper, nickel, lead, and zinc exceeded threshold effect levels. Soil levels of arsenic, chromium, copper, manganese, and zinc exceeded typical world soil values, with nickel at one site exceeding EEC limits for agricultural soils. Critically, arsenic, lead, and zinc levels in some vegetable samples were above WHO allowable limits, despite soil levels being acceptable, and cadmium was the most accumulated metal in vegetables.
Contamination & food safetyHealthUrban–rural linkageGrowing together: unveiling the potential of school-based community gardens to foster well-being, empowerment, and sustainability
2025Tinashe P. Kanosvamhira · Urban Transformations · South Africa (Cape Town)
This qualitative study investigated 13 school-based community gardens in low-income townships on the Cape Flats of Cape Town, South Africa, using semi-structured interviews. It found that while these gardens can enhance food security, nutrition, and community development, most urban community gardens in South Africa face significant challenges related to land tenure rights, often requiring negotiation for school land use. The research highlights both the advantages and the challenges of utilizing school land for community gardens.
Governance failureCommunityFood educationHealthPolicyCadmium and lead pollution in environmental and food matrices in Kakamega Town of Kenya highlighting risks in rapidly urbanizing regions of Africa
2025Doreen N. Meso, Enos W. Wambu, Gelas Simiyu, Shem M. Mwasi, Thomas Munyao · Discover Environment · Kenya (Kakamega Town)
This study assessed heavy metal pollution in agricultural soils, water, and pumpkin leaves from 21 sites across three zones in peri-urban Kakamega Town, Kenya. It found cadmium pollution in all water samples, and lead and nickel pollution in sections of soil and leafy vegetable samples. Lead pollution was linked to vehicular emissions near the town center, while cadmium enrichment in informal settlements implicated inadequate waste management. Sequential extraction showed 31–35% of soil cadmium was in exchangeable fractions, posing a risk of bioavailability, highlighting persistent heavy metal contamination with implications for public health, environmental sustainability, and agricultural productivity.
Contamination & food safetyHealthPeri-urban agricultureImpacts of rising food prices on the food security of different socio-economic groups in Abuja, Nigeria
2025Katuka, Stephen Agire, Magaji, Sule, Ismail, Yahaya · Zenodo (CERN European Organization for Nuclear Research) · Nigeria (Abuja)
This study analyzed the impact of rising food prices on the food security of different socio-economic groups in Abuja, Nigeria, using a cross-sectional survey of 400 households. Findings revealed that only 18% of households were food secure, while 56% experienced moderate to severe food insecurity. Food price inflation had a significant negative effect on food security, particularly among low-income households. Rising food prices were shown to increase the likelihood of mild, moderate, and severe food insecurity by 53%, 88%, and 132%, respectively.
Economic viabilityEconomicsHealthWelfareImplications of a Climate-Smart Approach to Food and Income Security for Urban Sub-Saharan Africa: A Systematic Review
2024Nolwazi Z. Khumalo, Melusi Sibanda, Lelethu Mdoda · Sustainability · Sub-Saharan Africa
A systematic review and bibliometric analysis examined the implications of climate-smart agriculture (CSA) practices and climate adaptation strategies for food and income security in urban Sub-Saharan Africa. The review found that CSA practices boost urban food production and income, but also recognized critical challenges and trade-offs requiring urban agriculture transformation.
Governance failureClimate changeFood sovereignty & justiceEconomicsHealthPeri-urban agriculture and household food and nutrition security around Eldoret, Kenya
2024Ivica Petríková, Melvine Anyango Otieno, Gertrude Were, Mahmoud Eltholth, Ana Rodriguez‐Mateos, Seeromanie Harding, Victoria Hall Morán, Odipo Osano, Jennifer Cole · Food Security · Kenya
This study investigated the links between peri-urban households' engagement in agriculture, their dietary behavior, and their children's nutrition outcomes around Eldoret, Kenya. Survey data collected from 518 households indicated that peri-urban households involved in agriculture, particularly crop growing and sales, had more diverse and nutritious diets than non-engaged households. However, a significant improvement in children’s health outcomes in these households was observed only when coupled with improved water, sanitation, and hygiene conditions.
Limited or null effectPeri-urban agricultureHealthFood sovereignty & justiceThe Health Burden of E-Waste: The Impact of E-Waste Dumping Sites on Child Mortality
2024Stefania Lovo, Samantha Rawlings · The World Bank Economic Review · Ghana, Nigeria
This study investigated the impact of e-waste dumping sites on neonatal and infant mortality, focusing on two major dumpsites in Ghana and Nigeria. Using a difference-in-differences approach, outcomes were compared for children born near and far from dumpsites before and after their creation. E-waste sites increased neonatal and and infant mortality for those living closer to the sites, with event studies suggesting effects emerge two to three years after site openings. There is suggestive evidence that contamination of water and of urban farming produce are among the drivers of the observed effects.
Contamination & food safetyHealthEconomicsAssessment of concentrations of heavy metals in three leafy vegetables irrigated with wastewater in Hadnet district, Mekelle, Ethiopia
2024Hailekiros Tadesse Tekle, Desta Berhe Sbhatu, Gebreselema Gebreyohannes · H2Open Journal · Ethiopia (Mekelle)
A study in Hadnet district, Mekelle, Ethiopia, assessed heavy metal concentrations in wastewater, spring water, and three leafy vegetables (lettuce, spinach, cauliflower). Wastewater samples from four experimental sites exceeded permissible limits for 4 out of 10 heavy metals (Cd, Cr, Cu, Mn), and spring water from a comparison site also exceeded limits for 4 metals (Al, As, Cd, Cu). Leafy vegetables grown in the least contaminated experimental site showed high concentrations for 6-7 out of 10 heavy metals, with lettuce and spinach having elevated levels of As and Al, respectively. The study concluded that the wastewater used for irrigation is not safe, the farm soils may have accumulated significant heavy metals, and the cultivated vegetables are highly contaminated, necessitating regulation of wastewater use for irrigation.
Contamination & food safetyHealthPeri-urban agricultureHeavy metals and trace elements contamination risks in peri-urban agricultural soils in Nairobi city catchment, Kenya
2023Arcadius Martinien Agassin Ahogle, Sammy Letema, Gertrud Schaab, Veronica Ngure, Abraham R. Mwesigye, Nicholas Kibet Korir · Frontiers in Soil Science · Kenya (Nairobi)
This study assessed heavy metal and trace element contamination risks in peri-urban farmlands in Nairobi city catchment, Kenya, by analyzing 60 soil samples from ten vegetable farming zones. Results showed elevated concentrations of elements including As, Cd, Mn, Pb, and Zn, with some exceeding permissible agricultural thresholds. As, Cd, Hg, and Pb exhibited high ecological risks, with Cd contributing 46-66% of the overall risk.
Contamination & food safetyPeri-urban agricultureHealthCommunity gardens and the social solidarity economy
2023Jade Morkel, Noxolo Dumani, Nick Malherbe, Shahnaaz Suffla · Community Development · South Africa
This case study, conducted in a low-income South African community, explored how a community gardener engages with the social solidarity economy (SSE) using thematic analysis of triangulated data from an interview, participant observation, and a participatory film. The study analyzed how the community garden fostered solidarity and established alternative micro-economic practices. It also considered challenges facing community gardens when connecting with the SSE.
Economic viabilityCommunityEconomicsHealthFood sovereignty & justicePrevalence and risk factors of childhood diarrhea among wastewater irrigating urban farming households in Addis Ababa
2023Adane Sirage Ali, Sirak Robele Gari, M.L. Goodson, Claire Walsh, Bitew K. Dessie, Argaw Ambelu · PLoS ONE · Ethiopia
This cross-sectional study investigated the prevalence and risk factors of diarrhea among children under five in 402 wastewater irrigation farming households in Addis Ababa, Ethiopia, from November 2021 to February 2022. The overall prevalence of diarrheal cases in children under five was 22.3%. Diarrhea was strongly associated with wastewater-related occupational exposure factors, including body washing with irrigation water, contaminated cloth with irrigation water, use of protective clothing during farm work, use of farm work cloths at home, and bringing unwashed farm tools home.
Contamination & food safetyHealthAssessment of Microbial Contamination in the Infulene River Basin, Mozambique
2023Clemêncio Nhantumbo, Nídia Cangi Vaz, Mery Rodrigues, Cândido Manuel, Sífia Rapulua, Jéssica Langa, Hélio Nhantumbo, Dominic Joaquim, Michaque Dosse, José João Sumbana, Ricardo Santos, Sílvia Monteiro, Dinis Juízo · Water · Mozambique
A study investigated fecal microbial contamination levels in river water, drainage water, and drinking water in the Infulene River Basin, Mozambique. Samples from the Infulene River and drainage showed 82% positive for Total Coliforms and 61% for Escherichia coli, while drinking water samples were 63% positive for Total Coliforms and 23% for Escherichia coli. The study confirmed a high vulnerability to microbial contamination across all investigated sources due to poor sanitation and a lack of drainage infrastructure.
Contamination & food safetyHealthWastewater governance in the upstream catchment of the Awash Basin, Ethiopia: challenges and opportunities for better accountability
2023Yosef Abebe, Mulugeta Gashaw, Asenake Kefale, Tim Brewer · Water Reuse · Ethiopia
A study on wastewater governance in the upstream catchment of the Awash Basin, Ethiopia, found that untreated wastewater discharged from industries is polluting rivers and the surrounding environment. Regulatory bodies have done little to enforce rules and directives for wastewater regulation, and due to poor implementation of laws, urban agriculture is expanding without concern for its negative health and socioeconomic impacts.
Contamination & food safetyHealthPolicyEconomicsClimate changeHeavy metal occurrence within urban agriculture practices in eastern zones of Nairobi city
2023Njenga John Ng’ang’a, Mukundi John Bosco, Masinde Peter Wasike, Kihurani Agnes Wanjiru · Journal of Agriculture Science and Technology · Kenya (Nairobi)
A study in Nairobi's eastern zone assessed heavy metal occurrence in urban farm inputs and food crops (tomatoes, arrowroots, kales). Cadmium, manganese, lead, and zinc concentrations were analyzed in soil, water, and crop samples. The study found that heavy metal contents, particularly cadmium, manganese, lead, and zinc, were above allowable limits in several crops, and based on FAO/WHO standards, were high for health concern.
Contamination & food safetyHealthUrban–rural linkageAssessment of Quality of Wastewater Being Used in Irrigating Soils under Urban Agriculture in Zaria Urban Area
2022Sani Abubakar Mashi, Samuel Yakubu, Sofia Yuniar Sani · Asian Research Journal of Agriculture · Africa
A study in the Kubanni basin of Zaria, Africa, evaluated the quality of wastewater used for irrigating urban agriculture soils. The wastewater contained arsenic, iron, chromium, copper, zinc, manganese, and lead. Although concentrations were generally below Nigeria's permissible limits for irrigation, the study noted the metals' tendency to accumulate in soils, raising concerns about potential heavy metal buildup in irrigated soils and crops.
Contamination & food safetyHealthOrganic cycleChromium Laden Soil, Water, and Vegetables nearby Tanning Industries: Speciation and Spatial Distribution
2021Adugnaw Maru Gezahegn, Fekadu Fufa, Esayas Alemayehu, Abebe Beyene · Journal of Chemistry · Ethiopia (Modjo city)
This study investigated the spatial distribution and speciation of chromium in water, soil, and edible plants in tannery-contaminated areas of Modjo city, Ethiopia. Total chromium in the Modjo River was 20.6 mg L−1 upstream, and soil Cr (III) and Cr (VI) concentrations were found to be higher than guideline values. Chromium concentrations in edible plants were also significantly higher than in control areas, with roots accumulating more chromium than leaves and fruits. It was concluded that water, soil, and edible plants in this area contain chromium concentrations higher than recommended for a healthy environment and human consumption.
Contamination & food safetyHealthUrban–rural linkagePredicting the Toxicities of Ternary Mixtures of two Metals and Sodium Dodecyl Sulfate to Serratia marcescens (SerEW01) from Otamiri River Water
2020Reuben 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.
Contamination & food safetyHealthFoodborne illness prevention in Debre Berhan, Ethiopia: Preliminary efforts to understand household agricultural practices
2020Hillary 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.
Contamination & food safetyHealthCompostOrganic cyclePratiques phytosanitaires en agriculture périurbaine et contamination des denrées par les pesticides : cas des maraîchers de Port-Bouët (Abidjan)
2019· Journal of Animal and Plant Sciences (J Anim Plant Sci ) ISSN 2071 – 7024 · Africa
A study in Port-Bouët, Abidjan, examined market gardeners' phytosanitary practices and pesticide residue incidence on lettuce. It found that 39.6% of pesticides used were not recommended for market gardening, 86.84% of gardeners did not protect themselves during application, and 80.26% did not observe pre-harvest intervals. Consequently, 93.33% of lettuce samples did not comply with Codex Alimentarius and EU standards due to high pesticide residue contamination.
Contamination & food safetyPeri-urban agricultureHealthFarmers' Perception, Willingness and Capacity in Utilization of Household Sewage Sludge as Organic Resources for Peri-Urban Agriculture around Jos Nigeria
2019Cosmos C. Alamanjo, Abimbola O. Adepoju, H. Martin, R.N. Baines · Zenodo (CERN European Organization for Nuclear Research) · Nigeria (Jos)
This mixed-methods study investigated farmers' perceptions, willingness, and capacity to use household sewage sludge as organic resources for peri-urban agriculture around Jos, Nigeria. Farmers were found to use a complex mix of fertilizers and were keen to utilize household sewage sludge for soil fertility, though constrained by accessibility. A critical finding was that household sewage sludge observed in the field is heterogeneous due to its proximity to urban refuse disposal, raising concerns for possible cross-contamination of pollutants and indicating a lack of extension guidance.
Contamination & food safetyPeri-urban agricultureOrganic cycleCompostHealth