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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Assessment 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 agriculturePotential 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 changeHeavy 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 agricultureHealthAdolescent Students’ Nutritional Knowledge in Boarding Schools and Strategies for Improving their Nutritional Status
2023Adedoyin Osasona Foluso · International Journal of Home Economics Hospitality and Allied Research · Nigeria (Ekiti State)
Adolescent students' nutritional knowledge and strategies for improving their nutritional status were investigated in boarding schools in the Ido-Osi Local Government Area of Ekiti State, Nigeria. A questionnaire was used with 80 boarding house students from three government and private colleges. Findings revealed that a good percentage of boarding school students possessed good nutritional knowledge.
Food educationHealthLosing the Plot: The Impact of Urban Agriculture on Household Food Expenditure and Dietary Diversity in Sub-Saharan African Countries
2023Navjot Sangwan, Luca Tasciotti · Agriculture · Sub-Saharan Africa
This cross-country study analyzed household data from nine Sub-Saharan African countries to investigate the impact of urban agriculture (UA) on household food expenditure and dietary diversity. Using an inverse-probability weighted regression adjustment method, the study found that households engaged in UA reduced overall food expenditure and increased spending on protein-rich foods like nuts, legumes, fruits, dairy, meat, and poultry. The impact of UA varied substantially across the food expenditure distribution.
EconomicsHealthFood sovereignty & justicePeri-urban agricultureCommunity 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 linkageUrban food systems: Factors associated with food insecurity in the urban settings evidence from Dessie and Combolcha cities, north-central Ethiopia
2023Amare Molla Dinku, Tefera Chane Mekonnen, Getachew Shumye Adilu · Heliyon · Ethiopia
A mixed-methods study conducted in Dessie and Combolcha cities, north-central Ethiopia, surveyed 506 resident households to measure the status of food insecurity in urban food systems. The study confirmed that 33.1% of respondents were food insecure, with nine and six individuals per 100 people forced to 'sleep hungry' and 'not eat in the whole day and night' respectively. Household food insecurity was significantly associated with the gender of the household head, participation in casual labor, and living house ownership, and the degree of food insecurity was deemed higher due to weak food system governance, an inconsistent food supply chain, and socio-economic and gender inequalities.
Food sovereignty & justiceEconomicsHealthAssessment of Nutrition Intervention Impact on Children in Machakos, Kenya by Deuterium Dilution Isotope Method
2023John Wakhanu · International journal of food science and agriculture · Kenya (Machakos)
This study assessed the impact of a nutrition intervention using African indigenous leafy vegetables (AILVs) grown in school gardens in Machakos County, Kenya, on body composition changes in school-going children (6-10 years) using the Deuterium Dilution Isotope Method (DDIM). An experimental cross-over design with two phases (Phase I: 13 weeks, Phase II: 12 weeks) was used, with 66 children in the experimental group and 46 in the control group in Phase I. Findings indicated high morbidity and low nutritional status, poverty, and poor AILV consumption among subjects, but DDIM showed a significant improvement in body composition in experimental groups (p<0.001).
Food educationHealthCommunityAssessment 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 cycleExploration of wheatgrass as functional food by using urban agriculture models for regulating growth & nutrients
2022Nilesh L. Patil, Anjali A. Kulkarni, Dinesh Amalnerkar, Swapnil C. Kamble · South African Journal of Botany · South Africa
This study assessed the growth and nutrient values of wheatgrass cultivated in soil, hydroponics, aeroponics, and paper-pulp based potting mix soil. Plantlets from potting mix soil showed the highest height (88.67 cm), weight (15.13 gm), and overall nutrient content. Cost analysis over six months revealed that potting mix soil systems were 17x and 23x cheaper than hydroponics and aeroponics, respectively, making them the most productive for long durations.
DIYEconomicsHealthThe invisible crisis: the determinants of local food insecurity in Gauteng municipalities, South Africa
2022Adrino Mazenda, Nonkosazana Molepo, Tinashe Mushayanyama, Saul Ngarava · British Food Journal · South Africa (Gauteng)
This quantitative cross-section study estimated the determinants of household food insecurity in the Gauteng City-Region, South Africa, using binary logistic regression on 13,616 observations from the Gauteng City-Region Observatory Quality of Life 2020/2021 data. The main findings highlight unemployment, health status, education, household size, indigency, and income as the primary determinants of food insecurity. Further studies are needed for an in-depth assessment of household coping mechanisms, the influence of government social grants, and access to credit.
HealthPolicyEconomicsWelfarePracticing Urban Agriculture Is the Most Appreciate Means to Fight Against Famine, Depression, Anxiety and Spread of Coronavirus
2021Chanie Derso Misganaw · Agriculture Forestry and Fisheries · Ethiopia
This review paper highlights the current lack of urban agriculture practice in Ethiopian towns and emphasizes its significance. Urban agriculture contributes to food self-sufficiency, social goodness, economic profitability, and environmental health, and is stated as the most appreciated means to improve livelihoods, generate income, create job opportunities, and fight against famine, depression, anxiety, and the spread of coronavirus. The paper discusses the types, principles, and prospects of urban agriculture based on updated information.
HealthEconomicsFood sovereignty & justiceClimate changeChromium 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 linkageThe Effects of the COVID-19 Pandemic on Food Security in Rural and Urban Settlements in Benin: Do Allotment Gardens Soften the Blow?
2021Mawuna Donald Houessou, Annemijn Cassee, B.G.J.S. Sonneveld · Sustainability · Benin
A Rapid Food Security Appraisal was conducted among 240 rural and urban dwellers in southern Benin to evaluate the effects of the COVID-19 ‘cordon sanitaire’ on food consumption. The pandemic affected food security pillars in both rural and urban areas, with the steepest decline observed among those inside the cordon sanitaire, particularly rural producers and urban inhabitants without allotment gardens. Increased food prices, logistics disruptions, and movement restrictions were cited as reasons, while access to allotment gardens effectively mitigated the crisis for households.
CommunityHealthWelfareUrban Horticulture in Sub-Saharan Africa
2020I.O. Amao · IntechOpen eBooks · Sub-Saharan Africa
This chapter conducted an empirical review of urban horticulture in cities across Sub-Saharan Africa, aiming to specify its benefits in the region. The review concluded that governments in these countries require political will to realize the identified advantages of urban horticulture, which include food and nutrition security, healthy environments, and sustainable livelihoods. It recommends raising awareness among stakeholders like politicians, policymakers, and urban households to integrate urban horticulture into land use planning.
Food sovereignty & justiceHealthEconomicsPolicyUse of Urban Agriculture in Addressing Health Disparities and Promotion of Ecological Health in South Africa
2020Michael Rudolph, Evans Muchesa, Florian Kroll · International Journal of Natural Resource Ecology and Management · South Africa
This paper reflects on key socio-economic challenges in South Africa and the role of urban agriculture in addressing health disparities and promoting ecological health. Using a structured mixed literature review and primary/secondary data, the study demonstrates the high prevalence of food and nutrition insecurity. However, it also emphasizes the positive outcomes of an integrated approach to addressing nutrition and food security, suggesting that multi- and trans-disciplinary methods based on ecological health promotion can improve food security, public health, and socio-economic development.
HealthPolicyFood sovereignty & justiceCommunityImpact of school garden on dietary diversity and micronutrient level of pre-school children in Makueni County –Kenya
2020Crippina Lubeka, Judith Kimiywe, Hudson Nyambaka · Research Journal of Food Science and Nutrition · Kenya (Makueni County)
This study assessed the effect of school garden interventions on improving serum zinc, iron, and retinol levels, and diet diversity, among pre-school children in Mulala ward, Makueni County, Kenya. A quasi-experimental design was adopted with 63 children, where intervention early childhood centers provided vegetables and animal proteins from school gardens for six months. Post-intervention, a significant difference was found in the mean dietary diversity score between the intervention and control groups, and a significant positive correlation was observed between serum hemoglobin, retinol, zinc levels, and dietary diversity in the intervention population.
Food educationHealthPredicting 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 cycleNutraceutical Uses of Traditional Leafy Vegetables and Transmission of Local Knowledge from Parents to Children in Southern Benin
2019Akakpo D. B., Achigan-Dako E. G. · Agronomy · Benin
Interviews with 360 respondents across three southern Benin villages on three traditional leafy vegetables, analyzing how use and knowledge transmission from parents to children vary by generation, gender, and village.
Heirloom & landraceFood educationCommunityHealthPratiques 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 agricultureHealth