Research & reports

Heather Graham, Gail Feenstra, A. Evans, Sheri Zidenberg‐Cherr · California Agriculture · United States (California)

A study (2004, California Agriculture) evaluates the Farm to School Connection, a comprehensive program in the Davis, California school environment that sought to promote lifelong healthy eating habits in children and connect the school garden, cafeteria, and classroom to local agriculture, including farmers'-market-style salad bars, classroom education, farm tours, and waste management. Evaluated through interviews and surveys of program leaders, teachers, and school staff, the program was found to increase participation in the school lunch program following the addition of salad bars, and numerous partnerships developed among those involved; the components of the Farm to School Connection are presented as evidence supporting comprehensive school nutrition programs and their positive impact on the school environment.

Kathryn E. Waitkus · Pepperdine Digital Commons (Pepperdine University) · United States

Prison physical environments and social climates have been found to be physically and mentally stressful for inmates, and more than 70% of those in the California prison system return to prison within three years of parole. As part of an effort to reduce this recidivism, a rehabilitative gardening program was started at San Quentin State Prison, and this primarily qualitative study set out to determine the garden project's impact on the physical environment and social climate of a prison yard from both inmate and staff perspectives, through interviews with inmate program participants, an inmate control group, and prison staff conducted before and after the garden was planted. The evidence suggested that (a) gardens invited attention, use, and refuge; (b) being in or near a garden could reduce stress; (c) gardens might provide "neutral" territory in a segregated prison yard; (d) inmate participants gained benefits from directly working with nature; (e) gardens created the possibility for hope and further change; and (f) prison staff were generally more concerned about the impact of the change than the inmates themselves. Inmate and staff expectations about the garden's impact were met or exceeded, leading to recommendations to use the Garden Program to build collaboration, trust, and respect between inmates and staff through active staff participation in classes, to expand the program to other California prisons, and to have paroled inmates collaborate with local communities on community gardens. Limitations included a reduction in program scale during the planning stages and the short time elapsed between pre- and post-garden research; the authors suggest a longitudinal study to track impact on inmates after parole.

Miura S., Kunii O., Wakai S. · International Journal of Food Sciences and Nutrition · Philippines (Davao City)

A structured survey of 152 mothers in two poor urban communities in Davao City examined home gardening and dietary diversity, finding limited but notable impact of garden produce on micronutrient intake. The study assessed a community-based approach promoting home gardening to address iron and vitamin A deficiencies.

Olufunke Cofie, R. van Veenhuizen, Pay Drechsel · · Sub-Saharan Africa

Urban and peri-urban agriculture (UPA) significantly contributes to food supply, employment, livelihoods, and poverty alleviation in many Sub-Saharan African cities, providing diverse foods including perishable items. However, UPA production often carries health risks from polluted urban water and faces challenges due to limited semi-official recognition and support from city authorities, sometimes conflicting with planners regarding land tenure and water use. More data is needed for appropriate recognition of this sector.

Joan M. Twiss, Joy Dickinson, Shirley Duma, Tanya Kleinman, Heather Paulsen, Liz Rilveria · American Journal of Public Health · United States (California)

Community gardens enhance nutrition, physical activity, and social capital, promoting public health and quality of life. The California Healthy Cities and Communities (CHCC) program funded successful community gardens in several cities, which incorporated local leadership, volunteers, and skill-building. These initiatives led to policies for land and water use, improved produce access, and strengthened community building skills.

Tony Binns, Roy Maconachie, Adamu Idris Tanko · Land Degradation and Development · Nigeria (Kano)

This paper examines health and environmental concerns associated with urban and peri-urban agriculture (UPA) in Kano, Nigeria. Empirical evidence indicates that industrial and domestic toxins are reaching dangerously high levels, leading to significant pollution of soils and water channels. This raises serious questions about the sustainability of UPA and the long-term health implications of toxin exposure.

Jac Smit, Anne C. Bellows, Katherine Brown · · Global

This handout, prepared by Anne C. Bellows, Katherine Brown, and Jac Smit, summarizes a fully cited article on the health benefits of urban agriculture. The original article is available for free from the Community Food Security Coalition (CFSC).

Ogunyemi Awodoyin, Taliat Opadeji · Emirates Journal of Food and Agriculture · Nigeria (Ibadan)

A 2003 study in Ibadan, Nigeria, investigated heavy metal contamination of Amaranthus cruentus L. grown on domestic refuse landfill soils. Lead (Pb) and Cadmium (Cd) concentrations in soils from four landfill sites and a control site ranged from 110.5 to 678.5ppm for Pb and 2.01 to 3.20ppm for Cd. Metal accumulation in Amaranthus cruentus L. tissues was proportionate to soil Pb concentrations, while Cd levels in crop tissues exceeded soil levels. Crop growth and yield were significantly reduced due to Pb and Cd contamination, leading to the conclusion that Ibadan landfills are unsafe for Amaranthus cruentus cultivation, with heavy metal concentrations in the vegetable tissues much higher than FAO/WHO dietary allowances.

Troy D. Glover · Journal of Leisure Research · United States

This narrative inquiry explored how 14 participants in the Queen Anne Memorial Garden, a community garden built to combat urban decline, collectively reconfigured events into a “success story.” The aggregated community narrative illustrates how a collective leisure pursuit can be a grassroots effort to address urban decline and reshape collective identity.

Tanja Pless‐Mulloli, Karen L. Foster, J Bush · Epidemiology · United Kingdom (Newcastle upon Tyne)

Investigations in Newcastle upon Tyne, UK, analyzed the extent and consequences of disposing 2000 tons of incinerator ash on over forty allotments. Soil, egg, and vegetable samples (75 soil, 21 egg, 65 vegetable) revealed contamination of footpaths with dioxin/furan (max 9000 ng/kg I-TEQ) and high levels of copper, lead, and zinc. Mean dioxin/furan levels in soil were 38 ng/kg I-TEQ and in eggs were 16.4 ng/kg I-TEQ, indicating significant contamination and potential exposure pathways for allotment gardeners and children.

Kabuye Umugeshiwu · Zenodo (CERN European Organization for Nuclear Research) · Rwanda

This comparative study evaluated the impact of school garden programs on nutrition knowledge among secondary school teachers in Kigali, Rwanda. A mixed-methods research strategy, including quantitative surveys (n=120) and qualitative interviews (n=6), was employed. Results showed an average improvement of 35% in teachers' nutrition knowledge post-intervention, indicating that school garden programs significantly enhance teachers' nutrition knowledge, correlating positively with improved academic performance among students.

Mariama Diop, Aminata Sow, Ibrahima Ndiaye · Zenodo (CERN European Organization for Nuclear Research) · Senegal (Dakar)

This research in Dakar's slums used a mixed-methods approach to study the link between community gardens and educational outcomes among school children. A preliminary analysis indicated that students participating in community gardens showed a 15% improvement in reading comprehension scores compared to non-participants. While further statistical testing is needed, the findings suggest a positive correlation between urban agriculture and educational outcomes for low-income children.

G. B. Luilo, Othman C. Othman · Journal de Physique IV (Proceedings) · Tanzania (Dar es Salaam)

This study measured heavy metal levels (cadmium, manganese, lead, and zinc) in Cynodon grasses near roads in Dar es Salaam City, Tanzania. Mean levels of lead and zinc varied exponentially with distance from the road up to 15m and correlated with average daily traffic, suggesting vehicular sources. For public health reasons, it is recommended that pasture grasses in road vicinities not be used for foraging dairy cattle and goats.

Bernard Keraita, Pay Drechsel, Philip Amoah · Environment and Urbanization · Ghana (Kumasi)

This study in Kumasi, Ghana, investigated the influence of urban wastewater on stream water quality and peri-urban agriculture through interviews and water quality assessments. It found that population increase and underinvestment in sanitation facilities led to large volumes of untreated wastewater entering streams. High levels of faecal coliform were recorded in the city's streams, downstream areas, and on vegetables sold in Kumasi’s markets due to contaminated wastewater.

Takashi Watanabe, Makoto Yokohari, Ryuto Matsuzawa · Journal of the City Planning Institute of Japan · Japan (Tokyo)

This study clarified farmers' responses to agricultural activities involving urban residents in Tokyo. The findings showed that over half of the farmers engaged in agricultural activities in cooperation with urban residents, and those enthusiastic about such activities tended to excel in farm management. Furthermore, municipalities within the target area were categorized into three types based on the proportion of farmers conducting agricultural activities with urban residents.

Hasan Belevi, Bettina Baumgartner · International Journal of Environmental Technology and Management · Global

This paper provides a systematic overview of urban agriculture in low and middle-income countries, identifying research needs. It highlights the importance of cross-cutting issues between urban agriculture and environmental sanitation, including excreta, wastewater, and solid waste management. Further research is needed to quantify the benefits, risks, opportunities, and constraints of urban agriculture, as well as its impact on food quality and the environment when reusing waste.

Neil S. Brantley · San José State University ScholarWorks (San Jose State University) · Global

This research project aims to provide a framework of relevant information for developing sustainable urban agriculture systems as a tool to improve the quality of life for the urban poor. Two different infrastructure contexts are presented, with the intent of relating the applicability of urban agriculture initiatives to enhancing destitute urban communities in both developed and developing worlds, referencing successful case studies. Urban agriculture is beginning to be recognized by the world community as one viable urban development option.

Takashi Watanabe, Makoto Yokohari, Ryuto Matsuzawa · Journal of the City Planning Institute of Japan · Japan (Tokyo)

This study clarified farmers' responses to agricultural activities involving urban residents in the Tokyo Metropolis. The findings showed that over half of the farmers engaged in agricultural activities involving urban residents, and those enthusiastic about these activities often demonstrated excellent farm management. Furthermore, municipalities within the target area were categorized into three types based on the proportion of farmers involved in urban resident-associated agricultural activities.

Innocent Nhapi, Huub J. Gijzen, Maarten A. Siebel · Water Science & Technology · Zimbabwe (Harare)

This study aimed to formulate an integrated wastewater management model for Harare, Zimbabwe, integrating resource recovery and reuse in urban agriculture. Harare was divided into five major operational areas, and specific options were considered to suit land use, development constraints, and socio-economic status within the overall criteria of limiting nutrient inflows into Lake Chivero. Flexible and differential solutions were developed in relation to the built environment, population density, user composition, ownership, future environmental demands, and technical, environmental, hygienic, social, and organizational factors.

Bright Agyeman, Kofi Owusu Afriyie · Zenodo (CERN European Organization for Nuclear Research) · Africa

Among primary school students in Ghana, who have limited access to fresh fruits and vegetables, a mixed-methods study combining pre- and post-intervention surveys with focus group discussions (n = 300) assessed changes in nutritional knowledge and behavior following a school garden program. After the program, the proportion of students eating at least one fruit daily rose statistically significantly (p < .05) from a baseline of 20% to 45% post-intervention. The findings indicate school garden programs effectively improve nutrition-related behaviors among Ghanaian primary school students, suggesting a need for replication and expansion.

Jeroen H. J. Ensink, Wim van der Hoek, Yutaka Matsuno, Sarfraz Munir, Muhammad Rizwan Aslam · CGSPace A Repository of Agricultural Research Outputs (Consultative Group for International Agricultural Research) · Pakistan

The use of untreated wastewater for irrigation is widespread in Pakistan's peri-urban agriculture, driven by water scarcity and lack of treatment funds. This practice has led to an uncontrolled expansion of wastewater use. The paper emphasizes the need to document this practice to find improvement methods within the financial constraints of low-income countries.

Steven A. Esray · Water Science & Technology · Global

This paper argues that ecological sanitation should be understood as a closed-loop approach to human excreta management, rather than merely an alternative toilet. With urban populations in Africa and Asia expected to double in the next 25 years, ecological sanitation can facilitate urban agriculture and avoid adverse environmental impacts of conventional treatment. This approach can significantly contribute to food security and public health in a sustainable future.

Mandima Bangala, Kamitombo Mbwata, Tshibangu Minko · Zenodo (CERN European Organization for Nuclear Research) · Ghana

This study investigated the impact of school garden programs on adolescent nutrition in Ghanaian schools using a mixed-methods approach with surveys, qualitative interviews, and linear regression analysis. A significant positive correlation was found between the number of school garden programs and improved adolescent dietary diversity. The findings suggest these programs can enhance nutritional outcomes, particularly dietary diversity, among participants.

Nigel Poole, DS Bhupal, Fiona Marshall, Dolf te Lintelo · · India

New knowledge is presented on the impacts of urban and peri-urban (UPU) environmental pollution on food safety attributes of vegetable marketing systems in India. Air pollution reduces crop yield and nutritional quality, and is a major source of particulate contaminants that accumulate at toxic levels in edible crops. The study explores the balance between public and private quality assurance initiatives and identifies wholesale markets as a potential entry point for quality assurance.

L.M. van den Berg · WIT transactions on ecology and the environment · Africa, Asia

Urban agriculture, despite severe competition for space, plays roles such as fresh food supply, leisure, supplementary income for the urban poor, and green space management. Case studies in Africa and Southeast Asia demonstrate the difficulty of maintaining these roles due to public health and environmental degradation concerns. Urban agricultural producers may rely on polluted streams for irrigation, cause soil erosion through inappropriate farming techniques, or poison surrounding residents with pesticides. The paper suggests that urban agriculture could be more beneficial to the urban system if treated by town planners as a normal urban function requiring both regulation and protection.