Research & reports

Bernard Keraita, Pay Drechsel, Flemming Konradsen · Journal of Risk Research · Ghana

A study in Ghana used participatory research methods to summarize farmers' perceptions of health risks and risk reduction measures in urban vegetable farming irrigated with untreated wastewater. Farmers were aware of health risks from wastewater, perceiving occupational skin infections as the greatest risk, while consumer health risks were rated very low. Many international risk reduction measures were deemed unsuitable by farmers, who preferred simple, low-cost alternatives.

Alberto Zezza, Luca Tasciotti, Zezza, Alberto, Tasciotti, Luca · AgEcon Search (University of Minnesota, USA) · Global

This paper investigates the importance of urban agriculture (UA) for poor and food-insecure households in urban areas, using survey data from 15 developing or transition countries. It aims to fill research gaps by analyzing, from a comparative perspective, UA's potential role in addressing urban food insecurity problems. The paper defines UA as crop and livestock production within city boundaries.

Tamara García–Armisen, Josué Prats, Yociel Marrero, Pierre Servais · Water Science & Technology · Cuba (Havana)

The Almendares River in Havana, Cuba, receives wastewater from over 200,000 inhabitants, resulting in very poor microbiological water quality downstream due to high faecal bacterial indicators (FBIs). This water is used for urban agriculture and recreation, despite not meeting microbiological standards. This study compared FBI removal in three wastewater treatment plants (WWTPs): a conventional facility, a constructed wetland (CW), and a solar aquatic system (SAS). Natural systems (CW and SAS) showed approximately two log units higher FBI removal efficiency than the conventional plant. The large conventional WWTP was found to have a negative impact on the river's microbiological quality.

J.N. Hogard, Julius N. Fobil, Godfred K. Ofosu-Budu, D. Carboo, Nii‐Ayi Ankrah, Alexander K. Nyarko · · Ghana

This study in Ghana investigated the macro-nutrient content and heavy metal concentrations in solid waste composts to assess their potential for soil fertility amelioration and health implications in urban and peri-urban agriculture. Overall NPK concentration was low, with agricultural waste composts showing higher total N, K, and organic carbon than municipal solid waste (MSW) composts. Heavy metal concentrations for Ni, Zn, Cu, and Cd were generally low and within Australian standards. However, lead (Pb) concentration in mixed MSW composts was significantly high during the dry season, exceeding the Australian limit of 150 mg/kg Pb for unrestricted use. Seasons and composting processes were found to be important determinants of toxic metal concentrations in final compost products.

Bernard Keraita, Pay Drechsel, Flemming Konradsen · Water Science & Technology · Ghana (Kumasi)

A study in Kumasi, Ghana, assessed the use of on-farm ponds to reduce microbial contamination in wastewater-contaminated irrigation water, analyzing over 300 samples. It found that while ponds are common, their potential for pathogen removal via sedimentation is not fully optimized. Helminth eggs reduced by about 70% with careful water collection, but thermotolerant coliforms took six days in the dry season to meet WHO guidelines, indicating suboptimal performance for some pathogens.

Pay Drechsel, Olufunke Cofie, R. van Veenhuizen, Theophilus O. Larbi · Irrigation and Drainage · West Africa

Informal irrigation in urban and peri-urban agriculture (UPA) in West Africa offers benefits but is often hindered by water pollution, threatening public health. A multi-stakeholder process implemented since 2005 in six West African cities, including Accra, Ghana, aimed to integrate UPA into sustainable urban development. However, an internal lesson learned was that local partners may not prioritize every project, and capacity-building efforts might not provide expected incentives for commitment.

BF Salahu, TO Dauda · Moor Journal of Agricultural Research · Nigeria

The food security status of farming households in Ibadan metropolis, Nigeria, was assessed using 89 questionnaires. The study analyzed urban farming and food security factors (energy and protein levels). Education related to urban farming practices was found to influence the food security status of the respondents.

Euis Suryaningsih · Jurnal Hortikultura · Indonesia (Bandung)

From January to July 2001, a field experiment on vegetable disease control in a mosaic farming system in periurban agriculture was conducted at a farmer's field in Rancaekek, Bandung, Indonesia. Treatments included white plastic net cages, biorational pesticides, Bacillus subtilis, a mixture of Mancozeb and Bacillus subtilis, and an unsprayed control. All tested alternative control methods were very effective against major diseases of chili pepper, shallot, eggplant, beans, and cucumber, but the use of poisonous synthetic pesticides in periurban agriculture increases the likelihood of contaminating humans and the environment.

M. B. David · African Affairs · Kenya

This study on urban agriculture in the Kenyan town of Nakuru illustrates health and environmental problems associated with keeping livestock in urban areas, the small size of plots cultivated, and the dependence of urban households on rural sources of food. These findings were observed in the context of economic hardships occasioned by structural adjustment programmes since the 1980s.

Ronald Labonté, Glenn Laverack · Palgrave Macmillan UK eBooks · Canada

In a Canadian city, a group of single mothers living in poverty started a community garden. This garden was primarily about creating capacity and empowering experiences, such as successfully negotiating with authorities, rather than just food production. For some, it served as a tool for political activism, while for others, it provided a sense of control and coherence through gardening.

Dorothy Blair · The Journal of Environmental Education · United States

An evaluative review of U.S. literature on children's gardening found that quantitative studies showed positive outcomes in science achievement and food behavior. However, these studies did not consistently demonstrate improvements in children's environmental attitude or social behavior, and validity and reliability issues reduced general confidence in the results. Qualitative studies documented a wider range of desirable outcomes, but teacher enthusiasm varied based on support and horticultural confidence.

Norio Hayashi, Teruo Wada, Hiroaki Hirai, Takaaki Miyake, Yoshimasa Matsuura, Norinaga Shimizu, Hiroshi Kurooka, Shousaku Horiuchi · Environment Control in Biology · Japan

A Japanese study examining the psychological effects of horticultural activity on mood state (POMS) among 61 subjects (22 men, 39 women, mean age 46). Active participation involved planting non-flowering pansies, while passive participation involved observing a community garden; one group engaged in 2 hours of active participation, while two other groups completed 6 hours of horticultural activity (with the 6-hour group in experiment 3 also completing a mid-point POMS assessment 2 hours in, alongside before/after measures). The overall POMS score for 2 hours of horticultural activity was significantly higher than for 2 hours of simply observing, and the greatest psychological effects were found among the group that engaged in 2 hours of active horticultural activity, suggesting that 2 hours of horticultural activity induces the best psychological effects among the conditions tested.

Evan Green · · United States (California)

A literature meta-analysis on lead contamination in urban farms was applied to Alemany Farm in San Francisco, California, where soil lead concentrations range from 60 to 720 ppm. It found that every food crop except tree fruits may pose a health risk if grown in Alemany Farm's soil. A phytoremediation plan using Indian mustard (Brassica juncea) to remove lead was found to exceed the farm's available budget, and its timescale made it impractical. The study concludes that phytoremediation is generally not feasible for small-scale urban farms and that other measures are needed to reduce lead exposure for urban farmers.

XU Yong-xian, Biao Huang · Soils · China

A study of a small-scale vegetable farming system in peri-urban Nanjing, China, monitored heavy metal balances and pollution potential from July 2003 to July 2004. Heavy metals entered the soil mainly through fertilization and irrigation, with organic manure application accounting for more than 98% of inputs. Annual heavy metal input in the area was significantly higher than in European farmland, while annual output was very low, under 10% of input, leading to accumulation of heavy metals in the plots; long-term vegetable cultivation had already caused heavy metal buildup in the soils. Copper, lead, zinc, and cadmium concentrations in vegetables and soil were still below national safety standard limits, so the vegetable farming system was assessed as currently safe. However, an evaluation that incorporated atmospheric deposition showed the region carries a high risk of copper, zinc, and cadmium contamination, and the study concludes that intensive vegetable cultivation will aggravate soil heavy metal pollution, potentially pushing the soil to Second Grade of the National Soil Environment Quality Standard within several decades.

Michelle Lee D’Abundo, Andrea M. Carden · Community Development · United States

A Community Garden Education Program created to combat obesity in a low-income community in eastern North Carolina, United States, was examined through observations conducted throughout the program and two focus groups held at the end of its first phase. The focus groups found that the administrators' initial program goals, centered on obesity reduction, differed from participants' own goals, which centered on wellness and community development. Participants also reported improved food sustainability as a result of the program.

Wakefield S., Yeudall F., Taron C., Reynolds J., Skinner A. · Health Promotion International 22(2):92-101 · Canada

Qualitative Toronto case study using observation, focus groups and interviews. Gardeners perceived numerous health benefits, including improved food access, nutrition, physical activity, mental health, and community cohesion.

Jayakody P., Gunawardana I., Guneratne S., Clemett A., Dissanayake P. · IWMI Research Reports (WASPA Asia Project Report 8), International Water Management Institute · Sri Lanka (Kurunegala)

This IWMI report documents peri-urban paddy cultivation using diverted municipal wastewater around Kurunegala city, highlighting the practice as representative of urbanization impacts on Sri Lankan agriculture while identifying significant public health risks from untreated effluent irrigation.

Emily J. Ozer · Health Education & Behavior · United States

While thousands of school gardens exist in the United States with anecdotal evidence of enhancing student learning, rigorous research on their effects and sustainability factors is limited. This review conceptualizes school gardens as systemic interventions for promoting student health and well-being and strengthening the school environment. It summarizes existing literature, provides a conceptual framework, and suggests further research to inform practice.

Do Thuy Trang, Kåre Mølbak, Phung Dac Cam, Anders Dalsgaard · Tropical Medicine & International Health · Vietnam (Hanoi)

A cross-sectional study in a peri-urban area of Hanoi, Vietnam, surveyed 400 agricultural households and examined 807 stool samples from 620 adults and 187 children for helminth infections. The study found that 39% of samples were infected with helminths, with Ascaris sp. at 21.6%, Trichuris sp. at 9.8%, and hookworm at 21.8%. Wastewater exposure was not a major risk, but lack of sanitation facilities and use of fresh or inadequately composted human excreta in agriculture were important risk factors for infection.

Michelle Melissa Althaus Ottmann, Áurea Portes Ferriani, Ricardo Serra Borsatto, Homero Cidade Júnior, Cláudio Ferraz Oliver, Eduardo Feniman, Lourival de Moraes Fidelis, Nilce Nazareno da Fonte · REVISTA BRASILEIRA DE AGROECOLOGIA · Brazil

Since August 2006, an urban agriculture, landscaping, and horticulture program has been developed with children attending the Casa da Videira NGO in Vila Fanny, Curitiba, Brazil. Weekly transdisciplinary sessions have shown preliminary results including increased children's interest in environmental topics, proposals for solutions, and changes in family attitudes. Qualitatively, the program has improved the visual appearance of the area and fostered team cohesion.

D. Winterbottom · · United States (New York City)

In New York City, unique park spaces have been created on reclaimed neglected urban land, meeting various community needs including social, spiritual, cultural, and ecological aspects. These gardens, created by Puerto Rican immigrants as recreations of their indigenous landscapes, are valued by users for their restorative benefits such as stress reduction, ability to regain focus, calming engagement with nature, and an increased sense of well-being. This paper presents how these spaces function as restorative refuges and places to express and affirm traditional cultural values.

Barbara Matthys, Andres B. Tschannen, Norbert T. Tian‐Bi, Hermann Comoé, Salia Diabaté, Mahamadou Traoré, Penelope Vounatsou, Giovanna Raso, Laura Gosoniu, Marcel Tanner, Guéladio Cissé, Eliézer K. N’Goran, Jürg Utzinger · Tropical Medicine & International Health · Côte d'Ivoire

A cross-sectional survey was conducted in urban farming communities in Man, western Côte d'Ivoire, involving 113 farming households (586 individuals) and 21 non-farming households (130 individuals). The prevalences of S. mansoni and hookworm in farming households were 51.4% and 24.7%, respectively. Risk factors for S. mansoni included close proximity to the Kô River, water contact with irrigation wells and ponds, and low education attainment, while risk factors for hookworm included living in smallholder irrigated rice plots or large rice perimeters, using domestic well water, and low socioeconomic status.

Nita Chaudhuri, Daryl Cole, D S Niang · Epidemiology · Senegal (Dakar)

A Participatory Education and Action Research (PEAR) process was conducted with 3 farmers in periurban Dakar, Senegal, and surveyed 55 farmers using pre- and post-intervention questionnaires. Post-intervention, farmers showed a clearer understanding of environmental impacts like water contamination and pesticide runoff, and perceived a broader range of health risks linked to urban agriculture. Observations also indicated reduced pesticide container litter in the fields.

Emily Brady · Ethics Place & Environment · Global

This article explores whether environmental and land art-making encourages positive aesthetic-moral relationships between nature and humans. It critically examines a particular type of aesthetic objection to these artworks and defends the work of Robert Smithson and Andy Goldsworthy, among others, against this charge. It is argued that some forms of environmental and land art show "aesthetic regard" for nature, rather than constituting an "aesthetic affront" to nature.

Donna Tangen, Ruth Fielding‐Barnsley · Australian Journal of Environmental Education · Global

This study evaluated the effects of school gardening on English as Second Language (ESL) students' learning about good nutrition in a culturally diverse school. Data collected indicated positive gains in student learning and increased feelings of belonging to the school community. The study suggested that teacher attitudes significantly influence ESL student engagement in environmental education, and garden-enhanced lessons provided effective experiential learning that supported in-class nutrition education.