Research & reports

José Tobias Marks Machado, Jeferson Tonin, Evandro Pedro Schneider · SHILAP Revista de lepidopterología · Brazil

This study, conducted in two schools in Cerro Largo - RS, Brazil, during 2013, performed a post-implementation analysis of ecologically based school gardens introduced through a university extension program. Positive results included the proliferation of similar projects. However, significant difficulties were emphasized in integrating the school gardens with disciplinary education, attributed to existing conservatism in the educational context.

Elizabete Cristina Ribeiro Silva, Alexandre Brasil Carvalho da Fonseca, Fernanda Pereira Dysarz, Ernani Jardim Reis · Alexandria Revista de Educação em Ciência e Tecnologia · Brazil

This research identifies parameters for school gardens in Brazil, analyzing various experiences and an urban public school case. The study correlates the health of students and farmers in agricultural activities, explicitly pointing out negligences in this regard. It argues that a healthy eating concept from school gardens requires an equally healthy production system, and attention to student safety can highlight farmers' working conditions, which is crucial for food and nutritional education.

Sara Parme · Educational Media Reviews Online · Global

The documentary film "Plant This Movie" (2014, 83 min) explores our relationship with food and the wasted space and resource of the 21st-century lawn. This film, one of many similar documentaries on urban farming, proposes learning from and improving upon past mistakes of the Green Movement. It notes that many agricultural nonprofits, including one highlighted, fail due to lack of funding, and while it suggests sustainability efforts should be run like a business, only a fraction of the film is dedicated to this aspect.

J.S.C. Wiskerke · · Global

This chapter focuses on urban food supplies and the challenges of managing waste flows from urban households and markets in developing countries. Large amounts of municipal solid waste, human excreta, and wastewater are produced, most of which end up in non-engineered landfills or pollute the urban environment. It is noted that these wastes pollute the urban environment, especially in low-income countries with less developed sanitation infrastructure.

Vide Adedayo · Journal of Research in National Development · Nigeria (Lagos)

This study investigated poultry waste management in urban vegetable farms in Metropolitan Lagos from an ecosystem to human health perspective. Using a transdisciplinary approach, community participation, and socio-cultural, physiochemical, microbiological, and clinical information, the research revealed negative impacts and health problems associated with poultry waste management due to poor storage, composting, and packaging techniques. Consequently, adverse effects on users were identified.

Sabine Lefkowitz · · United States (Portland)

This thesis examined the relationship between socioeconomic status (SES) and outdoor time in Portland, Oregon public elementary schools. The study found that higher SES elementary schools spend more time outdoors than low SES schools. This disparity amplifies existing disadvantages for children in high-poverty schools, suggesting an inequity in outdoor time provision.

Pay Drechsel, Keraita, Bernard N. · CGSPace A Repository of Agricultural Research Outputs (Consultative Group for International Agricultural Research) · Global

A CGIAR (Consultative Group for International Agricultural Research) perspective piece on food and water challenges at the urban-rural interface amid global urbanization. It states that in low-income countries, investments in waste management and sanitation are not keeping pace with population growth, so the urban "return flow" of waste is not adequately managed. Where polluted water is used for irrigation to feed cities, food safety becomes a crucial component of food security. The piece explicitly states that urban and peri-urban farming systems — often run by the informal sector — are the systems most affected by this resource competition and pollution. It describes CGIAR's Water, Land and Ecosystems (WLE) research program as working at the interface of agriculture and sanitation to address these urbanization-related challenges and opportunities.

Michelle L. Kaiser, Michele L. Williams, Nicholas T. Basta, Michelle D. Hand, Sarah Huber · Journal of Food Protection · 米国・オハイオ

Focus groups (n=67) in four low-income Ohio neighbourhoods plus soil tests at six sites. Residents wanted gardens for fresh produce but worried about soil. Lead, zinc, cadmium and copper were present (paint likely main source); arsenic/chromium and PAHs were low. Further management to cut Pb/Cd bioavailability is needed before food crops; longer-established gardens showed lower contaminant signals. Critical evidence that vacant-lot gardening requires soil risk assessment.

B.M. Mercado-Borrayo, Silke Cram Heydrich, Irma Rosas‐Pérez, Manuel Hernández Quiroz, Claudia Ponce De León Hill · International Journal of Phytoremediation · Mexico

In a natural wetland in the Mexico City Metropolitan Area — a major supplier of crops and flowers whose canals hold high concentrations of organochlorine (OC) and organophosphorus (OP) pesticides — bioaccumulation of these pesticides was studied in water hyacinth (Eichhornia crassipes), a plant considered a plague but suggested in the literature to have phytoremediation potential. In vivo bioaccumulation differences for OC pesticides were largely explained by their log Kow, while all OP pesticides showed bioaccumulation regardless of log Kow, and the higher bioaccumulation factors of some accumulated OC pesticides could not be explained by log Kow alone, suggesting passive transport into the plant. Translocation ratios showed water hyacinth to be an accumulating plant with phytoremediation potential for all the organophosphorus pesticides studied and some organochlorine pesticides, and an equation for free water surface wetlands with floating macrophytes showed pesticide removal by the wetland with room for improvement through better management.

Daniel Andrés Vega Castro, Ángela Patricia Salamanca Rivera · Luna Azul · Colombia (Bogotá)

A study measured lead content in common chard (Beta vulgaris L., acelga) grown in an urban garden within 500 meters of two major roads in Bogotá, Colombia (at coordinates 4°42'39.6"N, 74°5'46.6"W). Before planting, lead content in the cultivated soil and irrigation water was analyzed as a preliminary diagnosis of possible contamination sources. Cultivation was done by hand, with no fertilizer or pest-control products applied to avoid bias. At harvest, 10% of the total planted population was randomly sampled and analyzed by atomic absorption spectrophotometry following AOAC official method 968.08, yielding 0 ppm lead. Based on this result, the authors conclude that urban agricultural production can be an option that supports food security, not only through macro- and micronutrient intake but also through food quality and safety, since no lead was detected in the plant tissue.

Nimoh Fred, Ohene-Yankyera Kwasi, Poku Kofi, Konradsen Flemming, Claude-François Robert · Journal of Development and Agricultural Economics · Ghana

A study in Ghana's Shai-Osudoku district investigated farmers' attitudes toward excreta reuse for peri-urban agriculture, surveying 400 randomly selected respondents. A majority of respondents disagreed that excreta are waste and were willing to use them as fertilizer. However, a majority also agreed that excreta can pose health risks, and perceptions on reuse differed among households.

Brent F. Kim, Melissa N. Poulsen, Jared D. Margulies, Katie L. Dix, Anne Palmer, Keeve E. Nachman · PLoS ONE · United States (Baltimore, Maryland)

This study characterized urban community gardeners' knowledge and perceptions of soil contaminant risks in Baltimore, Maryland, United States, through surveys with 70 gardeners from 15 gardens and interviews with 18 key informants. It found low levels of concern and inconsistent knowledge regarding heavy metal and organic chemical contaminants among gardeners. Furthermore, barriers to investigating garden site history and conducting soil tests, along with limited knowledge of best practices for reducing exposure, were identified.

Aminata Koné, Kouamé M. Adou · Zenodo (CERN European Organization for Nuclear Research) · Congo (Kinshasa)

This article details a methodology developed in 2014 to assess the association between heavy metal contamination in market-sold vegetables and consumer biomarker exposure in Kinshasa, Congo. The cross-sectional design includes stratified random sampling of vendors, laboratory analysis of leafy vegetables for lead, cadmium, and mercury, recruitment of regular consumers for interviews and blood/urine sample collection, and statistical analysis using multiple regression. The described protocol was successfully piloted, demonstrating feasibility with a high participant recruitment rate.

Laura-Anne Minkoff-Zern · Antipode · United States

Research on farmworker food insecurity in the USA points out that food assistance providers often treat farmworkers' inability to afford healthy food as a lack of knowledge, reinforcing racialized assumptions that people of color do not know "good" food. This study argues that food security and healthy eating are not a matter of consumers making healthy "choices," but rather a matter of class-based and racial differences within the food system.

Muhammad Zaman, Faqir Muhammad Anjum, Ali Asghar, Muhammad Sajid · · Pakistan

This study estimated organophosphate pesticide exposure from okra and brinjal consumption in urban populations of Punjab, Pakistan. 90 samples each of okra and brinjal were collected from peri-urban areas of Faisalabad, Multan, and Gujranwala and analyzed for chlorpyrifos, profenophos, and triazophos residues. Findings showed that 85 (47.22%) of the 180 samples were contaminated, and 15 (8.33%) samples had residue values higher than Maximum Residue Limits (MRLs).

Prem José Vazhacharickal, Sumita Gupta Gangopadhyay · Kobra (Universitätsbibliothek Kassel) · India

This paper examines urban and peri-urban agriculture (UPA) in India, focusing on wastewater irrigation and its associated human health risks. The study identifies potential health hazards for farmers, laborers, and consumers, including microbial pathogens and helminth (intestinal parasites). While UPA is presented as an option to address urban food demand, the paper emphasizes that "good practice UPA" requires integrated approaches and suitable risk reduction mechanisms to improve safety.

Pay Drechsel, Andrew Adam‐Bradford, Liqa Raschid-Sally, Drechsel, Pay, Adam-Bradford, A., Raschid-Sally, Liqa · AgEcon Search (University of Minnesota, USA) · Ghana

This chapter introduces urbanization in West Africa, particularly Ghana, the general role of urban agriculture, and the common use of polluted irrigation water. It focuses on irrigated smallholder vegetable production, reflecting on the key challenges, dynamics, and resilience of this farming system.

Maggie Caroline McGriff · Journal of the Arkansas Academy of Science · United States

This study investigated whether three elementary school garden club programs influenced students' attitudes and behaviors regarding fruit and vegetable consumption. Quantitative analysis using pretest and posttest questionnaires found non-significant results, indicating no significant effect on participants' perceptions of fruit and vegetable consumption. Qualitative analysis of participant interviews also showed mostly non-significant changes in healthy eating, although participants reported positive experiences in other aspects like respect for nature and enjoyment of activities.

Joseph Agossou, Léonard Afouda, Julien Didier Adédémy, Alphonse Noudamadjo, Catherine N’da Tido, Emanliikpon Sylvain Ahohoui, Pierre G. Tovihoudji, Farouk Mazou, Benjami Fayomi, Simon Akpona, Sikiratou Adéothy-Koumakpaï, B Ayivi · Environnement Risques & Sante · Benin (Parakou)

This study analyzed the bacteriological and parasitic load in wastewater and market garden products from five major production sites in Parakou, Benin, where farmers use wastewater for irrigation. High concentrations of fecal coliforms, Escherichia coli, Salmonella enterica, Shigella spp., Entamoeba coli, Giardia intestinalis cysts, and helminth eggs were found in irrigation water, vegetables, and farmers' stools. The use of wastewater resulted in high contamination of vegetables, particularly cabbage, large lettuce, and carrot leaves, by fecal coliforms, Salmonella enterica, and Escherichia coli.

Gideon Aghaindum Ajeagah, Yaka Diane Armelle Moussima · Journal of Ecology and the Natural Environment · Cameroon

A study in an urban stream in Yaoundé, Cameroon, characterized Balantidium coli cysts and evaluated environmental factors influencing their dispersal. Round (825 ± 610 cysts/L) and oval (246 ± 300 cysts/L) cysts were found. High abundances of cysts were observed in stations along a piggery effluent near a major market, with higher densities recorded during the short rainy season. The lowest cyst densities were found upstream and downstream.

Jin‐Won Kim, In‐Wook Choi, Won-Seok Na, Enkhjargar Baljii, Yong-Man Yu, Young Nam Youn, Young‐Ha Lee · Journal of Food Hygiene and Safety · South Korea (Seoul)

From September to October 2012, 530 samples of nine vegetable types were collected from 11 urban community gardens in Seoul to assess their microbiological quality. Mean total aerobic bacteria and coliforms were detected at 6.3 log CFU/g and 4.3 log CFU/g, respectively, with coliforms found in 67% of samples and E. coli in 2.3%. While foodborne pathogens were not detected, the presence of coliforms and E. coli indicates room for improvement in microbiological safety.

Qiang Liu, Jingshuang Liu, Qicun Wang, Yang Wang · Human and Ecological Risk Assessment An International Journal · China (Jilin City)

This study investigated heavy metal pollution levels by collecting 50 soil samples from urban vegetable fields in Jilin City, China. Mean contents of Pb, Cr, Cu, Ni, Zn, and Cd were higher than their corresponding natural background values. However, the distribution of comprehensive pollution index values indicated that concentrations of these heavy metals in most agricultural fields did not exceed baseline values affecting agricultural production safety and human health according to China's soil environmental quality standard, concluding insignificant contamination by these metals in Jilin City.

LaShonda M. Stewart, Steven A. Miller, R. W. Hildreth, Maja V. Wright-Phillips · New Political Science · United States (Chicago)

A preliminary analysis of Chicago's 49th Ward, the first participatory budgeting experiment in the United States, examined whether it resulted in different budgetary priorities and met social justice outcomes. Citizens chose projects classified as low priority by research literature, and while there was no clear pattern of projects only in affluent areas, geographic clustering was evident. Select areas received projects like community gardens, while others were limited to infrastructure repairs, indicating mixed social justice outcomes.

UM Dawaki, A. U. Dikko, SS Noma, U. Aliyu · Nigerian Journal of Basic and Applied Sciences · Nigeria

A study investigated the total, exchangeable, and soluble concentrations of heavy metals (Cu, Cr, Ni, Zn, Pb, Cd) in urban agricultural soils along three rivers (Challawa, Jakara, and Watari) in Kano, Nigeria. Cadmium concentrations at Jakara and Challawa exceeded maximum allowable concentrations in soils. Heavy metal concentrations were found to be significantly higher in areas irrigated with industrial and domestic sewage (Challawa and Jakara) compared to the control site (Watari).

Green Hope, River Edge, New Jersey 07661, USA., Hye Jin Keum · Journal of people, plants, and environment · United States

The philosophical background and historical development of the school garden movement in the USA were examined. The movement demonstrated a process of formation, decline, and revival. It began to diminish after World War I and was pushed to extinction by technological advancements in the 1950s, before resurging from the 1990s to address childhood obesity, nature-deficit, and improve academic achievements.