Research & reports

GM Saifur Rahman, Tahmina Akter · Bangladesh Journal of Zoology · Bangladesh

An entomological study in September 2019 examined 100 houses across five areas of Gazipur City Corporation, Bangladesh, to identify dengue vector breeding grounds. Both Aedes vectors were found in all areas, with Aedes aegypti being dominant. Rooftop gardens and under-construction sites were identified as the most important breeding sites, and the study found a comparatively higher number of Ae. aegypti breeding, indicating a potential for a major outbreak.

Adugnaw 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.

Cecilia Herbón, María Teresa Barral, Remigio Paradelo · Applied Sciences · Spain (Santiago de Compostela)

The concentrations of trace elements Cu, Pb, Zn, Ni, Cr, and As were investigated in 55 urban soils in Santiago de Compostela, northwestern Spain. While most soils showed higher trace element concentrations than regional backgrounds, they were not classified as contaminated according to Spanish regulations. However, geoaccumulation index values indicated low to moderate pollution levels in most soils, with Cu, Pb, and Zn highest in city center green areas, and Cr and Ni linked to parent material lithology.

Christina Ergas · · United States

This chapter explores urban ecovillages in the United States, highlighting challenges faced by ecovillagers in a neoliberal context. It examines cultural conflicts between sustainability and consumer culture, and points out the exclusive, upper-class, white nature of the local food movement in the US. Monetary and time constraints have made local organic food an elite phenomenon, often cited as a first step to gentrification in urban communities.

Zachary Burt, C. Shambu Prasad, Pay Drechsel, Isha Ray · Journal of Water Sanitation and Hygiene for Development · India (Karnataka)

A preference-ranking model was developed to understand the acceptance of fecal sludge-derived fertilizer (FSF) in Karnataka, India, by modeling farmowners and farmworkers separately. The study found that farmers willing to use FSF prefer to conceal its origins from workers and their caste group, especially caste-adhering, vegetarian farmowners. Workers were open to FSF if it resembled cow manure, revealing that the waste economy in rural India is shaped by unacknowledged caste hierarchies and practices.

Chammi P. Attanayake, Ganga M. Hettiarachchi, Mónica Palomo, Gary M. Pierzynski, Blanca Calderón · ACS Agricultural Science & Technology · United States

The effect of limestone and composted manure on lead (Pb) in vegetables and Pb bioaccessibility was assessed in a contaminated urban garden (total Pb ~200 mg kg⁻¹). Amendments did not affect Pb in vegetables or Pb bioaccessibility. Peeling reduced Pb concentration in radish by half, and removing surface dust reduced Pb in leafy vegetables by 40-50%. Daily Pb intake from consuming lettuce and carrot/beetroot from this garden was approximately 1.5 times higher than the interim reference level proposed by the U.S. Food and Drug Administration.

Xingjia Wang, Wenbo Li, Dongyan Wang, Songze Wu, Zhuoran Yan, Jiaqi Han · Ecological Indicators · China

A 'trinity' assessment method was developed to evaluate heavy-metal contamination in peri-urban soil–crop systems in Northeast China, covering total, available, and accumulated heavy metals. While traditional methods indicated less contamination, the trinity method revealed spatial clustering of heavy-metal contamination in cultivated lands caused by urbanization and industrialization, and a decreasing urban–rural trend in contaminated areas, particularly in transition zones.

Sam Ramsden · Local Environment · United Kingdom (England)

This article analyzes a charity-led community gardening project in a disadvantaged northern English community, which operated for three years with external funding. While it successfully engaged marginalized people, leading to increased skills, confidence, reduced isolation, and improved wellbeing, the project faced significant challenges requiring professional management. Crucially, after the funding ended, the community garden's future was fragile, and the long-term sustainability of outcomes for marginalized participants was vulnerable due to economic viability issues.

Jonathan Hall, Isabel Shargo, Niya Khanjar, Jianna Howard, Laura Schmidt, Ashley Deng, Camryn Edwards, Isabelle Berman, Joseph Galarraga, Sacoby Wilson · Environmental Justice · United States

This study in Baltimore, Maryland, used GIS mapping and spatial analysis to assess the proximity of urban farms to environmental hazards, including those with heavy metal contamination. Analyses indicated that contamination of urban farms is a possibility due to proximity: more environmental hazards were found in census tracts with urban farms, and low-income communities of color had hazards near urban farms. Historically industrial areas showed a higher concentration of environmental hazards with heavy metal or unknown contamination.

Larissa Maas, Leila Amaral Gontijo · Saúde e Sociedade · Global

This case study investigated the cognitive demands and work complexity for urban organic farmers whose main economic activity is selling their products. The findings indicate that the cognitive load for these farmers is high, contributing to complex work. The study notes a lack of existing research on the cognitive load of organic urban agriculture workers, as it is still a nascent movement.

Isabel Shargo, Jonathan Hall, Ashley Deng, Niya Khanjar, Camryn Edwards, Isabelle Berman, Joseph Galarraga, Sacoby Wilson · Landscape Journal · United States (Baltimore)

This study in Baltimore, Maryland, used GIS mapping and hotspot analysis to assess the proximity of urban farms to environmental hazards. Most urban farms were located in low-income communities of color. However, most environmental hazards were not near urban farms but in predominantly White areas or historical industrial centers. Despite a generally low risk of contamination, some urban farms in low-income and Black/African American communities were potentially contaminated by hazardous sites.

Christy Gene Somsen · Digital Commons - USU (Utah State University) · United States (Utah)

Farmers’ markets, Community Supported Agriculture (CSA) programs, and community gardens, while aiming to help low-income families access fresh produce, often assist more middle-class families. In Utah, these programs could be improved, as the state does not utilize the WIC Farmers’ Market Nutrition Program or accept WIC Cash Value Vouchers, and has few Farm to School Programs.

Elisabeth Ziss, Wolfgang Friesl‐Hanl, Sophia Götzinger, Christoph Noller, Markus Puschenreiter, Andrea Watzinger, Rebecca Hood‐Nowotny · Sustainability · Europe

In the "Heavy Metal City-Zen" citizen science project, community members in urban gardens in Vienna, Austria collaborated on collecting soil and plant samples to assess heavy metal contamination risk. Trace metal concentrations were generally below guideline thresholds, but at a few garden sites soil concentrations of lead, cadmium and zinc exceeded Austrian recommended limits, and at two sites plant trace metal concentrations exceeded European food standard limits; the project proposes expanding the citizen-led sampling to all of Vienna so new gardens can assess local soil risk before planting.

Anna Barra Caracciolo, Valentina Terenzi · Microorganisms · Global

A review of the rhizosphere as a microhabitat of intense chemical dialogue between plants and microorganisms covers synergistic interactions that can enhance plant function and productivity, including responses to stress conditions such as heavy metal (HM) contamination, alongside the risks such contamination poses. Where heavy metals are present in agricultural soils, there is a risk of metal uptake by edible plants leading to bioaccumulation in humans and animals with detrimental health consequences, and plant productivity itself can be negatively affected; many bacteria have defensive mechanisms for resisting heavy metals and can improve plant responses to HM stress, but achieving such beneficial rhizosphere interactions is described as hard to attain in agroecosystems managed with traditional practices that focus on maximizing crop yield.

Anthony Kamara, Foday Thullah · Journal of Nuclear Technologyin Applied Science (JNTAS) /Journal of Nuclear Technologyin Applied Science (JNTAS) · Africa

A study measured background radiation at the two major dumpsites in Freetown, Sierra Leone — Kingtom and Granville Brooke — which are also used for urban agriculture and where youths scavenge scrap metals and plastics daily. Using a portable Radiagem survey meter and GPS, researchers took 10 in-situ dose-rate measurements at each site. The mean equivalent dose rate was 0.8 mSv/year at Kingtom and 1.1 mSv/year at Granville Brooke; Kingtom slightly exceeded the UNSCEAR permissible limit but stayed below the ICRP limit, while Granville Brooke exceeded both the UNSCEAR and ICRP limits. The study concludes both dumpsites could become unsafe in the near future from cumulative radiation exposure for workers, scavengers and other exposed individuals.

James J. Connolly · · United States (California)

This case study examines the leading edge of gentrification along San Francisco's Third Street T streetcar line. Bayview-Hunters Point (B.V.H.P.), the end of the streetcar line's first phase, is an ethnically mixed, working-class neighborhood and the last historic concentration of African American residents in San Francisco. While gentrification-driven change is already visible further up the line, its presence in B.V.H.P. remains comparatively shallow so far. Nonetheless, many residents and community activists perceive that a fast-moving gentrification frontier leaves them with a conundrum: remain in a contaminated, post-industrial, climate-exposed environment, or advocate for their health while risking displacement. The neighborhood has seen greening such as community gardens and a waterfront promenade, alongside inequalities including enduring racial segregation, environmental privilege, green gentrification, luxury development, climate-related health risks, and continued exposure to contamination.

Yvonne Ma, Jessica Chen, Karen Fong, Stephanie Nadya, Kevin J. Allen, Chad Laing, Kim Ziebell, Ed Topp, Laura M. Carroll, Martin Wiedmann, Pascal Delaquis, Siyun Wang · Antibiotics · Canada

Genomic and phenotypic analysis of 55 Shiga toxin-producing E. coli (STEC) isolates of diverse serotypes, recovered from surface waters and sediments in a mixed urban/agricultural landscape in British Columbia, Canada (Antibiotics, 2021), found reduced antibiotic susceptibility across multiple drug classes: florfenicol (65.5%), tetracycline (52.7%), ampicillin (49.1%), streptomycin (34.5%), amoxicillin/clavulanic acid (21.8%), kanamycin (20.0%), ceftiofur (18.2%), trimethoprim-sulfamethoxazole (12.7%), gentamicin (10.9%), chloramphenicol (7.3%), ceftriaxone (3.6%) and cefoxitin (3.6%), while all isolates remained susceptible to ciprofloxacin, nalidixic acid, ertapenem, imipenem and meropenem. Eight isolates (14.6%) were multidrug resistant, and resistance genes including floR, dfrA, sul1/2, tetA/B, aadA, aph, blaTEM-1b and blaCMY-2 were identified alongside multiple plasmid replicon types. The resistance profiles matched those reported in generic E. coli from food animals, and the authors conclude that aquatic environments in the region are a potential reservoir for the maintenance and transmission of antibiotic-resistant STEC, their resistance genes, and associated plasmids.

Olga Romanova, Sarah Taylor Lovell · Urban Agriculture & Regional Food Systems · Global

This review assesses the capacity of woody species (trees and shrubs) used in urban food forests to accumulate polycyclic aromatic hydrocarbons (PAHs), heavy metals (HMs), and metalloids, given limited existing literature on food-safety risk in urban fruit- and nut-producing trees compared with annual crops. General trends identified were (a) lower risk of HM and PAH accumulation in woody species than in vegetables, and (b) less accumulation in the fruit of woody species than in other parts of the same species. However, these trends are not always consistent, and accumulation depends on factors such as the concentration of a given contaminant in the environment, contaminant type, and species or variety. The review states there is a critical need for more research on the safety of growing edible fruits and nuts on trees and shrubs in contaminated urban environments.

Yuliia V. Medvedeva, Анатолій Кучер, Joanna Lipsa, Maria Hełdak · International Journal of Environmental Research and Public Health · Europe

A study assessed the safety of apples sampled across different functional zones of Kharkiv, Ukraine — from industrial areas to school gardens — for consumption. Heavy metal levels exceeded maximum allowable limits in apple samples from all sampling sites, with lead 11.47 to 38.86 times and cadmium 1.76 to 5.68 times the FAO/EU norms; the most contaminated samples came from residential areas, partly due to significant land pollution from various waste types. Hazard index (HI) values varied by age group: 24.37-70.11 for children aged 1-6, 10.28-29.59 for children aged 7-16, and 0.88-2.53 for adults aged 18-65. Non-carcinogenic risks were linked to disorders of the immune, blood, urinary, and nervous systems and to liver and kidney function, and the total carcinogenic risk from eating the apples exceeded the permissible level.

Doris González-Fernández, Ana Sofía Mazzini Salom, Fermina Herrera Bendezu, Sonia Huamán, Bertha Rojas Hernández, Illène Pevec, Eliana Mariana Galarza Izquierdo, Nicoletta Armstrong, Virginia Thomas, Sonia Vela Gonzáles, Carlos Gonzáles Saravia, Marilyn E. Scott, Kristine G. Koski · Frontiers in Public Health · Peru (Lima)

In peripheral settlements of the Pachacámac district of metropolitan Lima, Peru, community health promoters delivered a sequence of (1) home and community gardens, (2) 'conscious nutrition' and (3) parenting workshops (ICDP), comparing 113 children aged 0–3 in intervention communities with 127 in control communities at baseline, 8 and 12 months. The interventions significantly reduced the risk of food insecurity (adjusted risk ratio 0.20, 95% CI 0.08–0.51) and of language delay (0.39, 0.19–0.82), but did not significantly improve motor or social/cognitive delay. Multiple micronutrient supplement use lowered motor delay risk (0.12), while households with more pets had higher risk of motor delay (3.24), social/cognitive delay (2.72) and food insecurity (1.73). Because gardens were bundled with nutrition and parenting components, the contribution of the gardens alone cannot be isolated.

Emily A. Holmes, Mary F. Campbell, Wesley James, Karen Matthews · Ecology of Food and Nutrition · United States (Mississippi Delta)

This research evaluated the impact of school garden programs on fifth-grade students' garden knowledge, self-perception, and standardized test scores in the Mississippi Delta. The study found no effect on standardized test scores, but students showed increased garden knowledge and reported positive feelings about their future, teamwork, and leadership ability, supported by observations of joy and confidence.

Jonathan London, Bethany B. Cutts, Kirsten Schwarz, Li Schmidt, Mary L. Cadenasso · Agriculture and Human Values · United States (California)

This study, based on 24 interviews with urban agriculture (UA) leaders in Sacramento, California, identifies three "taproots" of UA projects: justice, health, and market. The analysis reveals how these roots interact differently with racial capitalism, creating disparities in their growth trajectories. Specifically, UA projects associated with the justice taproot are historically underrepresented and undervalued.

Jeffrey Gilbert, Christina Chauvenet, Brett C. Sheppard, Molly De Marco · Journal of Agriculture Food Systems and Community Development · Global

This study investigated leadership styles and volunteer engagement in community gardens through interviews with 13 garden managers and six focus groups with 48 volunteers. Findings revealed that managers struggled to recruit and retain volunteers capable of maintaining gardens. Garden managers exhibited either collaborative or directive leadership styles, both of which were acknowledged and appreciated by participants.

Fatin Natasya Shuhaimi, Nursuriati Jamil, Raseeda Hamzah · Bulletin of Electrical Engineering and Informatics · Global

This study proposed and evaluated two Internet of Things (IoT)-based smart farming system designs for personal use in residential apartments, focusing on humidity and temperature monitoring. After comparing sensor readings (DHT 11 and DHT 22) over three days against actual environmental values, and assessing implementation costs and power consumption, the findings regarding accuracy and costs were inconclusive.

Paulo de Oliveira Neto, Andréa Rossi Scalco, Ana Elisa Bressan Smith Lourenzani, Sandra Cristina de Oliveira · Ciência e Natura · Brazil

This study analyzed the impact of urban agriculture on food security in community gardens in the city of Maringá, Brazil. The research was carried out using the EBIA method, with descriptive statistical analysis and multiple linear regression procedures. The results indicate that the activity did not contribute to the food security of people who depend on the resources generated, whether for consumption or income.