Research & reports
Peer-reviewed research and reports on community urban agriculture, food education, composting, welfare and more.
Theme
Critical findings
21 results
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 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 cycleMunicipal 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 cycleEconomicsA 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 cyclePolicyProduction of Edibles and Use of Garden Waste in Domestic Gardens of a Middle-Class Suburb in Cape Town, South Africa
2021Anjali Mistry, Manfred Spocter · · South Africa (Cape Town)
A study in a middle-class suburb of Cape Town, South Africa, investigated edible cultivation and garden waste management in domestic gardens. While potential gardening space averaged two-thirds of residential plots, 129 respondents primarily cultivated lawns, not food, with minimal vegetable production. Residents often used private gardening services for waste disposal, and on-site garden waste disposal techniques need promotion.
Limited or null effectDIYCompostCommunityUrban–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 agricultureWaste 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 & justiceCompost5. 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 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 cycleCompostHealthChapitre 19. Valorisation agricole des déchets domestiques et industriels dans les agrosystèmes en Afrique de l’Ouest et à Madagascar
2017Dominique Massé, Moussa N’Diénor, Edmond Hien, Tovonarivo Rafolisy, Yacine Badiane Ndour, Alfonse Bilgo, Serge Houot, Christine Aubry · IRD Éditions eBooks · Sub-Saharan Africa
This chapter reviews research since 2006 on composting urban waste and using municipal landfill screenings in Sub-Saharan Africa. In Ouagadougou, urban waste compost significantly increased sorghum yields (2 to 5 times higher than controls) over two years, with phosphorus content being crucial when concentrated at plant level, and mineralization rate determining yield when spread. In Madagascar, soil from the Andralanitra landfill showed value as an amendment or fertilizer for tomato cultivation, though application principles and safety need definition. However, municipal landfill screenings from Dakar did not achieve yields comparable to horse manure when tested on tomato crops.
CompostOrganic cycleUrban–rural linkageEconomicsVers une valorisation des déchets ménagers en agriculture (péri) urbaine à Kolwezi : caractérisation et influence de la saisonnalité
2017Upite Joseph Tshala, Misonga Alain Kitabala, Mwamba Jean-Pierre Tunda, Kayakez Michel Mufind, Miji Arsene Kalenda, Kanyimbu Georges Kapele, Kimuni Luciens Nyembo · Journal of Applied Biosciences · Africa
This study, conducted from May 2015 to April 2016 in Kolwezi, assessed the agronomic characteristics of compost from household waste and determined its biodegradable fraction for agricultural use. Waste was collected from 100 households, revealing biodegradable and non-biodegradable fractions, with quantities varying by season and commune. The biodegradable fraction represented 53% of the average monthly waste of 1001.5 kg per household. Major element concentrations were relatively high compared to Cameroon, while heavy metal concentrations were well below international standards.
CompostOrganic cyclePeri-urban agricultureEffects of biochar, waste water irrigation and fertilization on soil properties in West African urban agriculture
2017Volker Häring, Delphine Manka’abusi, Edmund Kyei Akoto-Danso, Steffen Werner, Kofi Atiah, Christoph Steiner, Désiré Jean‐Pascal Lompo, S.G.K. Adiku, Andreas Buerkert, Bernd Marschner · Scientific Reports · Sub-Saharan Africa
This 2-year study in Tamale (Ghana) and Ouagadougou (Burkina Faso) investigated the effects of biochar, wastewater irrigation, and fertilization on sandy, nutrient-depleted soils in urban vegetable production. Biochar addition (2 kg m⁻²) initially doubled soil organic carbon (SOC) stocks, but 35% SOC losses occurred afterward. Both biochar types had no effect on soil pH, phosphorus availability, or cation exchange capacity, though rice husk biochar retained nitrogen. The study found that the effects of biochar and waste water were less pronounced than reported elsewhere.
Environmental trade-offsOrganic cycleCompostClimate changeAgriculture urbaine et valorisation des déchets au Bénin : une approche de développement durable
2010Hygin Faust Kakai, Alban Gilles Kakai, Armelle Grey Tohouegnon · VertigO · Benin (Cotonou)
This study in Benin examined urban agriculture and waste valorization in Cotonou, Abomey, and Abomey-Calavi. In Cotonou, overexploitation of sandy, organic-poor soil in market gardening led to soil impoverishment, forcing gardeners to use chemical fertilizers with negative environmental impacts. However, some market gardeners adopted compost use, transitioning to organized organic urban agriculture after a waste management project supported waste valorization. This dynamic was not observed in Abomey, where urban agriculture is practiced in family spaces and public areas, unlike Cotonou's developed sites. Abomey-Calavi, despite rapid demographic growth, was almost devoid of urban agriculture practices.
Environmental trade-offsOrganic cycleCompostEconomicsHealthImproving food security through environmental management in Ibadan: the case of the Ayeye community.
2009Bolanle Wahab, M. K. C. Sridhar, Aramide Ayorinde · Urban Agriculture Magazine · Nigeria (Ibadan)
The Sustainable Ibadan Project (SIP), established in 1994 by UNCHS (HABITAT), identified waste management and conversion to organic fertilizer as top priorities for Ibadan. Participants at a 1995 City Consultative Forum jointly identified aerobic composting technology using windrows as a viable method to collect and recycle waste, generate income, and use compost for urban agriculture.
CompostOrganic cycleFood sovereignty & justiceCommunityConverting City Waste into compost pilot Nairobi (LNV-BO-10-006-115) : report phase one: inventory and assessment
2009P. Kirai, J. Gachugi, Anne Scheinberg · Data Archiving and Networked Services (DANS) · Kenya (Nairobi)
The 'Converting City Waste in Compost Project' aims to develop a viable system for collecting, processing, distributing, and marketing organic city waste for urban and peri-urban agriculture in East Africa, particularly Nairobi. Phase one of this project involved an inventory and analysis of organic waste sources, quantifying and characterizing non-domestic organic waste streams in Nairobi City. This study presents the findings of phase one, providing a basis for evaluating the potential to divert Nairobi's organic waste for compost and biogas production.
CompostOrganic cyclePeri-urban agricultureEnvironmental concerns of urban and peri-urban agriculture: case studies from Accra and Kumasi.
2001E. Mensah, Philip Amoah, Pay Drechsel, Robert Clement Abaidoo · CABI Publishing eBooks · Sub-Saharan Africa
This work, presented as case studies from Accra and Kumasi, addresses environmental concerns of urban and peri-urban agriculture. It focuses on waste composting for urban and peri-urban agriculture, aiming to close the rural-urban nutrient cycle in Sub-Saharan Africa.
Environmental trade-offsPeri-urban agricultureCompostOrganic cycleEstimating rural-urban nutrient flows for mega-cities
2001Jens Færge, Jakob Magid, F.W.T. Penning de Vries · CGSPace A Repository of Agricultural Research Outputs (Consultative Group for International Agricultural Research) · Sub-Saharan Africa
This 2001 entry from CGSpace references a publication titled "Waste composting for urban and peri-urban agriculture: closing the rural-urban nutrient cycle in Sub-Saharan Africa." The publication, edited by Drechsel and Kunze, focuses on waste composting to manage nutrient flows between rural and urban areas in Sub-Saharan Africa.
CompostOrganic cyclePeri-urban agricultureRecognizing Ethiopia's urban farmers.
1993Lee M · PubMed · Ethiopia
In Ethiopia, urban agriculture faces significant challenges due to government disapproval of public land use for farming and difficulty in obtaining credit. A 1983 survey in Addis Ababa found that 17% of 1352 households produced their own food on less than 25 sq. meters, with 90% of non-farmers citing lack of land. Despite urban agricultural cooperatives demonstrating 70% higher member income, their lack of government legalization prevents access to loans for productivity improvement.
Governance failureCommunityEconomicsPolicyFood sovereignty & justiceHealthWelfareClimate changeUrban–rural linkagePeri-urban agricultureFood educationBiodiversityCompostDIYElderlyFood lossHeirloom & landraceOrganic cyclePollinatorsFood miles & supply chainCSA & TeikeiDigital agriculture