Research & reports
Peer-reviewed research and reports on community urban agriculture, food education, composting, welfare and more.
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Critical findings
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Remediation of Contaminated Soils Using Organic Waste and Waste Products in Sub-Saharan Africa: A Review of Technologies, Adoption and Challenges
2026· Soil Systems · Sub-Saharan Africa
Reviews remediation of contaminated soils in Sub-Saharan Africa using organic waste and waste-derived products as sustainable, cost-effective amendments amid soil contamination driven partly by urban expansion.
CompostOrganic cycleVertical gardening undergirds household food security: evidence from Nairobi's Kibera informal settlements
2025Otieno J.A., Omia D.O., Amwata D.A. · Frontiers in Sustainable Food Systems · East Africa (Kenya)
Evidence-based study demonstrating how vertical gardening (particularly sack farming) in Kibera's informal settlements underpins household food security. Shows how stacking soil-filled sacks vertically enables vegetable production in space-constrained environments, serving as a solution to chronic hunger.
CommunityFood educationFood lossOrganic cycleExploring compost production potential and its economic benefits and greenhouse gas mitigation in Addis Ababa, Ethiopia
2025Shimelis G., Kim D., Yimer F., Tadesse M. · Science of The Total Environment · Africa (Ethiopia)
2025 study estimating compost production potential from municipal organic waste and human excreta in Addis Ababa, Ethiopia, with projections through 2050. Quantifies economic benefits (compost sales, fertilizer cost reduction), soil carbon sequestration, and greenhouse gas mitigation. Demonstrates feasibility of organic waste-to-compost systems for urban agriculture in African cities.
CompostOrganic cycleFood educationPolicyAssessment 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 cyclePeri-urban agricultural management impacts the soil nutrient status of Nitisols in the central highlands of Kenya
2025Rintaro Kinoshita, Hanna Takahashi, T. Kato, Daniel N. Sila, Hiroshi Koaze, Masayuki Tani · Soil Science & Plant Nutrition · Kenya
An evaluation of soil profiles, surface soil conditions, and nutrient management was conducted in Kiambu County, Kenya, at the Tigoni experimental station and 26 surrounding small-scale peri-urban farms. The study found significant differences in surface soil nutrient status between the experimental station and surrounding farms, with available phosphate and exchangeable calcium levels being excessively high in nearly half of the peri-urban farms, contrary to past findings. In contrast, phosphate levels at the experimental station were mostly deficient, and magnesium was deficient in both settings.
Peri-urban agricultureOrganic cycleThe role of treated wastewater in fostering sustainable urban agriculture in Addis Ababa, Ethiopia
2025Gizaw Ebissa, Hayal Desta, Aramde Fetene · Discover Water · Ethiopia (Addis Ababa)
This research assessed the contribution of treated wastewater (TW) from Bole-Lemi Industrial Park in Addis Ababa, Ethiopia, to agricultural sustainability over a 3.5-month production season. It found that 53 kg of nitrogen and 1 kg of phosphorus were recovered, saving farmers 5,535 USD and reducing fertilizer costs by 28%. The TW provided 17,500m3 of irrigation water, converting 70 hectares of idle dry-season land into productive use. Continuous monitoring of soil conditions is crucial for long-term sustainability.
Organic cycleEconomicsClimate changeMunicipal solid waste management in Ethiopia – Physical and chemical compositions and generation rate: Systematic review
2024Tsegay Kahsay Gebrekidan, Gebremariam Gebrezgabher Gebremedhin, Abraha Kahsay Weldemariam, Meaza Kidane Teferi · Journal of the Air & Waste Management Association · Ethiopia
A systematic review of municipal solid waste management (MSWM) in Ethiopia found a generation rate of 0.38 kg/ca/day, with waste predominantly composed of food waste, ash, dust, sand, and yard waste. Over 85% of this waste is reusable or recyclable, with 73.13% being organic matter. Despite suitability for composting and biogas, challenges include a lack of political will, weak municipal planning, and inadequate infrastructure, resulting in only 31.8% of MSW being legally collected.
CompostOrganic cycleEconomicsExploring the factors influencing urban farmers’ perception and attitude toward the use of excreta-based organic fertilizers in Arba Minch City, Ethiopia
2024Abrham Kassa Ejigu, Kumelachew Yeshitela · Frontiers in Sustainable Food Systems · Ethiopia
This study assessed factors influencing urban farmers’ intentions to adopt excreta-based organic fertilizers in Arba Minch City, Ethiopia, using the Combined Model of Theory of Planned Behavior and Technology Acceptance Model (C-TPB-TAM). Data was collected via surveys from urban farmers. Findings indicate that attitudes, perceived behavioral control, perceived usefulness, and perceived ease of use significantly affect farmers’ intentions. However, the subjective norm did not significantly affect farmers’ intentions.
CommunityOrganic cyclePotential of ecological water treatment elements to reduce pollution of river water used for urban agriculture in Addis Ababa, Ethiopia
2024Terusaw Solomon, Kumelachew Yeshitela, Wondmagegn Taye Abebe · Discover Water · Ethiopia (Addis Ababa)
This study assessed the effectiveness of a vetiver grass floating treatment wetland in reducing irrigation water pollution at the Mekanisa-Gofa-Lafto Cooperative farm in Addis Ababa, Ethiopia. After a 7-day treatment, the wetland reduced BOD (73.68%), COD (73.92%), pH (0.39%), Chloride (43.12%), Total Hardness (66.56%), and TSS (96.21%), approaching recommended irrigation water quality guidelines within 3 days. However, Electro Conductivity (22.2%) and Sodium (15.2%) concentrations increased, exceeding recommended values.
HealthOrganic cycleClimate changeIntegrating resource oriented sanitation technologies with urban agriculture in developing countries: measuring the governance capacity of Arba Minch City, Ethiopia
2023Abrham Kassa Ejigu, Kumelachew Yeshitela · Frontiers in Sustainable Cities · Ethiopia (Arba Minch City)
A study assessed Arba Minch City's governance capacity to integrate resource-oriented sanitation technology with urban agriculture. The findings indicated that the city's capacity is hindered by a lack of systematic monitoring, fragmented policy tools, and inadequate public sector participation. There is no single government body responsible for integration, and a behavioral gap exists among users in adapting to new technologies and recovered organic fertilizer.
Governance failurePolicyOrganic cycleClimate changeA review on waste management and compost production in the Middle East–North Africa region
2022Hussein L., Uren C., Rekik F., Hammami Z. · Waste Management & Research · Middle East, North Africa
Comprehensive review of waste management and composting strategies in MENA region, with implications for circular urban agriculture in water-scarce contexts.
CompostOrganic cyclePolicyEvaluation of Oyster Mushroom (Pleurotus ostreatus) Production Using Water Hyacinth (Eichhornia crassipes) Biomass Supplemented with Agricultural Wastes
2022Ejigu N., Sitotaw B., Girmay S., Assaye H. · International Journal of Food Science · Ethiopia
Evaluates water hyacinth biomass, alone or mixed with wheat/teff straw, as a low-cost substrate for oyster mushroom cultivation. The authors conclude water hyacinth is a promising cheap substrate owing to its ideal C/N ratio and low lignin, while also helping control the invasive weed.
DIYOrganic cycleEconomicsAssessment 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 cycleCover Crops in Vegetable Production and Urban Farming in Sub-Saharan Countries
2021Michael Kwabena Osei, Mavis Akom, Joseph Adjebeng‐Danquah, Kenneth Fafa Egbadzor, Samuel Oppong Abebrese, Kwabena Asare Bediako, Richard Yaw Agyare · · Sub-Saharan Africa
This abstract discusses the decline in soil fertility and accelerated desertification in Sub-Saharan Africa, including Ghana, due to decades of cropping. It introduces cover crops as a method to manage soil erosion, soil fertility, soil quality, water, weeds, pests, diseases, biodiversity, and wildlife in agro-ecosystems. The abstract also notes the increasing proportion of Ghana's population living in urban communities and that vegetable cultivation is conventionally a trade for rural dwellers.
Organic cycleClimate changeUrban–rural linkagePotential for Sustainable Urban and Peri-Urban Agricultural Practices in Nairobi County
2021Mary Njoki Mwaura, Sabina Mukoya-Wangia, Japheth Ododa Origa, O.L.E. Mbatia, Evans Chimoita · Journal of Agricultural Extension · Kenya
A study of 149 respondents in Nairobi County examined urban and peri-urban agricultural practices, finding composting and open field farming popular but not the most profitable. More profitable practices like cattle rearing and mushroom farming were unpopular due to expensive inputs and specialized skills. The study indicates that popular practices are less profitable, highlighting a need for transformation towards controlled environment agriculture with policy support.
Economic viabilityCompostOrganic cycleEconomicsPeri-urban agricultureDigital agricultureA Comprehensive Review of Biomethanation of Urban Food Waste in Nairobi City County, Kenya
2021Hope Baxter Chamdimba, Isaiah Omosa, Simon M. Wandera · Journal of Energy Environmental & Chemical Engineering · Kenya (Nairobi)
This review analyzed urban food waste in Nairobi City County, Kenya, which accounts for 64% of recoverable municipal solid waste, totaling 29.4 thousand tons annually. The study found that food waste has a biomethane potential of 508.45 ml CH4 /g VS, suggesting that the city's food waste could yield 10.5 million m3 of methane and 1.38 MW of electricity. While food waste is increasingly used for animal feed and composting, its application for energy recovery via anaerobic digestion is limited by a lack of source separation. Biogas is shown to be more economical than liquefied petroleum gas, but long-term methane generation requires supportive policies.
Food lossOrganic cycleEconomicsWaste to resource: use of water treatment residual for increased maize productivity and micronutrient content
2021Tariro Gwandu, Lynsay I. Blake, Hatirarami Nezomba, Jairos Rurinda, Stephen Chivasa, Florence Mtambanengwe, Karen L. Johnson · Environmental Geochemistry and Health · Sub-Saharan Africa
An eight-week greenhouse experiment in Sub-Saharan Africa evaluated the short-term benefits of applying aluminum-based water treatment residual (Al-WTR) with compost and inorganic phosphorus fertilizer on maize productivity. A co-amendment of 10% Al-WTR and 10% compost significantly increased maize shoot biomass (3.92 ± 0.16 g) compared to the control (1.33 ± 0.17 g). Adding phosphorus fertilizer to this co-amendment further doubled the yield and increased maize uptake of zinc, copper, and manganese.
CompostOrganic cycleEconomicsEXPLORING THE RECYCLING OF MANURE FROM URBAN LIVESTOCK FARMS: A CASE STUDY IN ETHIOPIA
2021Solomon Tulu Tadesse, O. Oenema, Christy van Beek, Fikre Lemessa Ocho · Frontiers of Agricultural Science and Engineering · Ethiopia
This study in Jimma, Ethiopia, from 2015-2050, used an N mass flow model and field experiments to explore manure recycling from urban livestock farms under four scenarios. It found that livestock manures are the main organic wastes in urban areas, and manure production in urban and peri-urban agriculture (UPA) is projected to increase 3 to 10 times. Critically, only 13% to 38% of manure nitrogen will be recycled in croplands, and intensification of urban livestock production greatly increased nitrogen surpluses, indicating a significant environmental tradeoff.
Environmental trade-offsOrganic cyclePeri-urban agricultureFood sovereignty & justiceCompostPathways for the Amplification of Agroecology in African Sustainable Urban Agriculture
2020Cristiana Peano, Stefano Massaglia, Chiara Ghisalberti, Francesco Sottile · Sustainability · Africa
This work reports case studies from the Slow Food Association in Africa to demonstrate the importance of agroecological models in small-scale agricultural systems. It focuses on the development of school and community gardens in small urban areas across different African countries. These models are presented as a tool for integrating agricultural activities aimed at social resilience and the conservation of ecosystems, aligning with SDG #12 Responsible Production and Consumption.
Climate changeOrganic cycleFood sovereignty & justice5. Changes in bulk and surface properties of two biochar types during 12 months of field ageing in two West-African soils
2020Kofi Atiah, Edward Yeboah, Eric Nartey, D.Y.I. Lawson, Volker Häring, Andreas Buerkert, Bernd Marschner · West African Journal of Applied Ecology · West Africa
This study investigated the changes in properties of rice husk and corn cob biochars applied in urban agricultural field soils in Tamale, Ghana, and Ouagadougou, Burkina Faso, over 12 months. Biochars were buried at 20 cm depth, and evaluated based on soil management practices and time. No significant interaction effect was found between soil management practices and time, but time significantly affected most biochar ageing properties. In both biochars, ash content, fixed carbon, cDOC, hDOC, cSUVA, and hSUVA increased, while pH and volatile matter contents significantly decreased.
Organic cycleCompostClimate changeFoodborne 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 cycleSoil Properties and Fertility Management within Ruiru Peri-Urban Area in Kiambu County, Kenya
2020F. 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.
Economic viabilityOrganic cyclePeri-urban agricultureEconomicsVegetable production and nematodes infestation: Impacts on small-scale farming communities of South Africa
2020Oso 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.
Economic viabilityCommunityEconomicsFood sovereignty & justiceOrganic cycleFarmers' 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 cycleCompostHealthDrought Mitigation Policies: Waste Water Use, Energy and Food Provision in Urban and Peri-Urban Africa
2019Hendrick J. Bruins · · Africa
This paper discusses drought mitigation in urban and peri-urban Africa, where severe droughts threaten food production under rainfed agriculture. It argues that while urban and peri-urban farming's informal private sector should not be government-controlled, the treatment and use of urban wastewater in agriculture requires government planning, investment, and extension services. Participatory development is suggested to integrate central wastewater planning with private farmer use.
PolicyPeri-urban agricultureFood sovereignty & justiceOrganic cycle