Research & reports

Sara R. Healy, Eric R. Morgan, Joaquín M. Prada, Martha Betson · Food and Waterborne Parasitology · United Kingdom

This proof-of-concept study investigated the presence of Toxocara spp. eggs on 82 'ready-to-eat' vegetable samples (lettuce, spinach, spring onion, celery) from 16 community gardens in southern England. Two lettuce samples tested positive for Toxocara spp. eggs, showing an overall prevalence of 2.4% for vegetable samples and 6.5% specifically for lettuce. This study is the first to demonstrate Toxocara spp. eggs on vegetables grown in community gardens in the UK and Europe, highlighting biosecurity and zoonotic risks.

Aisling Bailey, Jonathan Kingsley · Land · Australia (Melbourne)

This qualitative study explored perceptions of benefits and challenges in six urban community and allotment gardens in Melbourne, Australia, through semi-structured interviews with 23 participants. Findings identified perceived benefits and demographic patterns, but also highlighted challenges to participation due to insecurity around ongoing land access. The gardens were perceived to contribute to social and environmental wellbeing.

Ling Zeng, Shan Jiang, Linhai Jing, Yuan Xue · Remote Sensing · China

Heavy metal concentrations of Cd, As, Pb, Cu, Cr, and Hg were investigated in 86 soil samples from Jinzhou near China's Bohai Bay coast. The study showed that Cu and As contaminations in parts of this area were over the natural level but not polluted, while Cr contamination was omnipresent over the natural level and reached polluted levels in some parts. As and Cu contamination were linked to agricultural planting and aquacultural activities, and Cr contamination was potentially due to vehicle emissions and steel manufacturing or geochemical factories.

Subhash Aswal, Harshal Purohit, P. K. Gupta, K. K. Yadav, Laxman Jat, Shipra Jaiswal, R. A. Kaushik · International Journal of Plant & Soil Science · India (Kota)

A quarterly survey in Kota district, Rajasthan, India, characterized wastewater-irrigated soils by comparing them with tube well water-irrigated soils from ten urban sites. The study found decreased sand content, pH, and dehydrogenase activity, while porosity, EC, BOD, COD, OC, available-NPK, SO4, Cl, and heavy metals (Mn, Fe, Zn, Cu, Ni, Cd, Pb, Cr) increased. Some parameters exceeded Indian standard permission limits, indicating contamination, with highest values observed in summer.

Daniel Sax, Lorien Nesbitt, Shannon Hagerman · Environment and Planning E Nature and Space · Canada (Vancouver)

A case study of an urban farm in Vancouver, Canada, facing displacement due to redevelopment, revealed that urban residents engaged in urban greening can be both implicated in and impacted by green gentrification processes. The study highlighted the power dynamics farm members navigate to preserve land access and found that the farm's identity was co-opted by development agents as a branding tool. This research contributes to understanding the limitations of development processes in accounting for green gentrification risks.

Anna Paltseva, Zhongqi Cheng, Murray B. McBride, Maha Deeb, Sara Perl Egendorf, Peter M. Groffman · Frontiers in Ecology and Evolution · Global

This synthesis paper summarizes current scientific knowledge on lead (Pb) contamination in urban garden soils and provides clear recommendations for assessing actual health risks and limiting exposure. Urban garden soils often contain elevated levels of Pb, mainly from legacy sources, which is a main barrier for urban gardening. Amendments are noted as unreliable for treating contaminated soils to reduce risk, as they do not always make contaminants less harmful.

Nini Sané, Malick Mbengué, Amandine Laffite, Serge Stoll, John Poté, Philippe Le Coustumer · Water · Global

This study developed a wastewater treatment plant prototype coupled with Moringa oleifera seeds to reduce fecal indicator bacteria and antibiotic-resistant bacteria in domestic wastewater. The prototype alone reduced bacteria by 99.34%. The addition of Moringa oleifera seeds achieved high removal rates for E. coli (36.6–78.8%), fecal coliform (28.3–84.6%), Vibrio cholera (35.3–95.6%), and total flora (32.1–92.4%). For antibiotic-resistant bacteria, removal rates were up to 98% for E. coli and fecal coliform, 100% for Vibrio cholera, and 91.96% for total flora.

Ro'fatul Maulaa, Niken Kusumarini, Dian Triastari Armanda · BIOLOGICA SAMUDRA · Indonesia (Semarang)

The potential and constraints of urban farming development on the railroad border in Bangetayu Wetan Village, Genuk District, Semarang City, Indonesia, were investigated through observation, interviews, and documentation. The approximately 1 to 2-hectare area cultivated crops such as corn, cassava, and sugarcane, with yield predictions sufficient to meet food needs. However, the presence of pests, diseases, and weeds were identified as constraints, indicating challenges for urban farming development.

Ilona Liliána Birtalan, Imre Fertő, Ágnes Neulinger, József Rácz, Attila Oláh · BMC Public Health · Hungary

This study examined situational and engagement-related work difficulties for Community Supported Agriculture (CSA) farmers in Hungary, using interpretive phenomenology and semi-structured interviews. The research found that new modes of consumer-producer connectivity create novel issues for farmers, leading to three experiential themes: conflicted autonomy, the pressure of boxes, and social overload. These difficulties are rooted in the economic characteristics of alternative agriculture and structural conditions that require conflicting farmer roles. The study highlights the health and wellbeing costs of sustainable farming, noting that farmers often lack the time, experience, or skills for new producer-consumer connections.

Annie Stéphanie Nana, Timo Falkenberg, Andrea Rechenburg, Annet Adong, Anne Ayo, Pierre Nbendah, Christian Borgemeister · Agriculture · Cameroon

This study investigated factors influencing farming practices and disease prevalence among 130 vegetable producers in the lowlands of Yaoundé, Cameroon, through a cross-sectional survey. Education level and farm size were positively associated with overall fertilizer use, while pesticide usage was positively associated with years cultivated but negatively with land ownership. Waterborne disease prevalence was linked to education level, and malaria prevalence to farmer gender. The location of cultivated areas significantly influenced reporting malaria and headaches, concluding that despite associated health risks, vegetable production is necessary for farmers’ livelihoods.

Noëllie W. Kpoda, Hamidatu S. Darimani, Adama Ouéda, Idrissa Ouédraogo, Gustave B. Kabré · Agricultural Sciences · Burkina Faso (Ouagadougou)

This study evaluated the risk of parasitic infection among vegetable producers in Ouagadougou, Burkina Faso, who use polluted water, employing a quantitative microbiological risk assessment method. Protozoa and helminths from 9 species were detected in irrigation water, with Ancylostoma sp. eggs being common and severe across all water types. Contamination risk was higher for groups using raw wastewater than for those using well water, and halved for those using treated wastewater; however, regardless of water type, gardeners had an approximate 9.83 × 10−1 pppy probability of Ancylostoma sp. infection.

Naomi Reyes, Montserrat Ganderats‐Fuentes, Francesco Acciai, Jessica Eliason, Punam Ohri‐Vachaspati · Journal of School Health · United States (New Jersey)

This study examined school garden prevalence in 148 K-12 schools across four low-income New Jersey cities between 2010-2011 and 2017-2018, before and after the Healthy Hunger-Free Kids Act (HHFKA) of 2010. Garden prevalence increased from 19% in 2010-2011 to 32% in 2013-2014, but this increase was not sustained over time. Furthermore, schools with a majority Hispanic student enrollment had approximately half the odds of having a garden compared to schools with a majority Black student enrollment.

Laura Boluspayeva, Monika Jakubus, W. Spychalski, Akhan Abzhalelov, Yertas Bitmanov · International Journal of Environmental Research and Public Health · Kazakhstan (Oskemen)

This study investigated heavy metal contamination in soils and vegetables due to the metallurgic industry in industrial areas of Oskemen, Republic of Kazakhstan. The greatest amounts of metals were found in soils and vegetables from the industrial zone, with the lowest in the suburban zone. Lead concentrations exceeded WHO/FAO standards in all analyzed vegetable samples, leading to the conclusion that consumption of vegetables cultivated in industrial areas should be restricted due to health risks.

Anithadevi Kenday Sivaram, Logeshwaran Panneerselvan, Aravind Surapaneni, Elliot Lee, Kurunthachalam Kannan, Mallavarapu Megharaj · Environmental Advances · Australia

This study assessed 19 commercially available composts, garden soils, and potting mixes in Australia for 38 per- and polyfluoroalkyl substances (PFAS). Total PFAS concentrations ranged from 1.26 to 11.84 µg kg−1 (dry weight), with total perfluorinated carboxylic acids (ƩPFCAs) being higher than perfluoroalkyl sulfonic acids (PFSAs). The total oxidizable precursor assay (TOPA) showed an increase in short-chain ƩPFCAs (0.48 to 7.63 µg kg−1) in composts and potting mixes, indicating transformation of PFCAs precursors. The measured concentrations of short-chain PFCAs in soil substrates have the potential to contribute to plant uptake and food chain transfer of PFAS to humans.

Maurice Kesonga Nsele, Jules Nkulu Mwine Fyama, Kevin Maréchal, Thomas Dogot · Agriculture · Democratic Republic of Congo (Lubumbashi)

In urban agriculture in Lubumbashi, Democratic Republic of Congo, an innovative technology package was disseminated, but ten years later, farmers' daily income was less than USD 1.25, and critical exceedances of heavy metal content standards in crops were recorded. Survey data from 202 farmers and a Logit model identified factors influencing the sustained adoption of two innovations: motor pumps and integrated soil fertility management. Socio-demographic factors were not significant for motor pump adoption, and only mutual aid moderately influenced integrated soil fertility management. Economic factors like land tenure and income diversification were significant for motor pump adoption, but no economic factors were significant for integrated soil fertility management. Institutional factors such as access to credit and association membership were significant for the sustained adoption of both innovations.

S.B. Jilcott Pitts, R.A. Seguin, J. Kolodinsky, E.H. Morgan, M.J. White, M. Sitaker, J.T. McGuirt, W. Wang, K.L. Hanson, A.S. Ammerman · UNC Libraries · United States

This study examined perspectives on food access among 53 low-income families with children participating in a cost-offset community-supported agriculture (CO-CSA) program across nine communities in the US states of New York, North Carolina, Washington, and Vermont. Focus groups revealed that while produce quantity was abundant and affordability was generally good, payment timing was a barrier for some, and unfamiliar foods and quick spoilage hindered acceptability. The study concluded that CO-CSA may facilitate increased access to fruits and vegetables, but perceptions of positive diet change may be limited by challenges in incorporating share pick-up into regular travel patterns and meal planning, with food waste concerns being particularly acute for families with constrained resources.

Ainsley C. McStay, S.L. Walser, Eric C. Sirkovich, Nicolas Perdrial, Justin B. Richardson · Journal of Environmental Quality · United States

This study evaluated portable X-ray fluorescence (pXRF) measurements of macronutrients, micronutrients, and toxic elements (As, Pb) in soils and plants from 10 urban community gardens across the eastern United States. It found that pXRF and traditional methods provided agreeable estimates for some elements (Mn, Cu, Zn, Pb) but not for macronutrients (Ca, K, P). While pXRF is an accurate tool for screening Mn, Cu, Zn, and Pb, macronutrients were poorly estimated in fruits, leaves, and roots, and genus-specific and garden-specific factors may be important for plant uptake models.

Michel Shengo Lutandula⃰, Fabien Ilunga Mpanga · The Global Environmental Engineers · Democratic Republic of Congo (or Africa)

In Katuba municipality, Lubumbashi, Democratic Republic of Congo, irrigation water, soil, and harvested amaranth from an area of urban amaranth cultivation were analyzed for chemical and microbiological pollutants. Water and amaranth were polluted on both mineral and microbial fronts, while soil was not; water samples contained Paramecia, Entamoeba histolytica eggs, fecal contamination indicator germs, mesophilic flora, and pathogens including Aeromonas hydrophila and Pseudomonas aeruginosa. Amaranth cobalt concentrations exceeded quality standards and the plants were contaminated with Paramecia, Entamoeba histolytica eggs, Escherichia coli, and Klebsiella planticola, leading to the conclusion that consuming these amaranths poses health risks to the population.

Nirosha Ruwani Amarasekara, Abdullah Ibn Mafiz, Xun Qian, James M. Tiedje, Weilong Hao, Yifan Zhang · Journal of Agriculture and Food Research · Global

Metagenomic analysis of total soil DNA from urban vegetable garden soils examined the co-occurrence of antibiotic resistance genes (ARGs) with resistance genes to other compounds, including heavy metals and biocides. Relative abundance was 2.00-2.90 x 10^-1 copies per 16S rRNA gene for ARGs and 4.22-6.00 x 10^-2 for metal resistance genes (MRGs), with the most abundant ARGs conferring multidrug, vancomycin, bacitracin, fosmidomycin, and macrolide-lincosamide-streptogramin (MLS) resistance, alongside MRGs for copper, arsenic, multiple metals, iron, and chromium, biocide resistance genes (BRGs) for multi-biocide, peroxide, and phenolic compounds, and multi-compound resistance genes (MCRGs) combining biocide-metal, drug-biocide-metal, and drug-biocide resistance. Multidrug resistance genes (including mexF, mexW), the MLS gene macB, and the MCRG ruvB showed the strongest correlations with other resistance genes, demonstrating extensive co-occurrence of ARGs, MRGs, BRGs, and MCRGs in urban agricultural environments and suggesting that soil contaminants have potential as co-selection agents for antibiotic resistance.

Peter Sanjo Adewale, Sunday Clement Olubunmi Makinde, V. Kusemiju, Olawole O. Obembe · Journal of sustainability and environmental management · Nigeria

This study measured and compared lead (Pb), cadmium (Cd) and manganese (Mn) concentrations in soil and leafy vegetables (Amaranthus hybridus, Celosia argentea, Corchorus olitorius) using atomic absorption spectrophotometry at Urban Expressway Farms (UEF) and Peri-urban Road Farms (PRF) in Lagos State, Nigeria. It found the highest Pb concentration (0.93+/-0.06) in Celosia argentea at UEF, and the highest Cd (0.51+/-0.11) and Mn (0.98+/-0.02) concentrations in Amaranthus hybridus at UEF, with Pb in Celosia argentea 5 m from the expressway and Cd in Amaranthus hybridus 10 m from the expressway exceeding WHO/FAO permissible levels; heavy metal residue levels were driven more by farm location than by vegetable type, and the study calls for regular monitoring to prevent consumption of contaminated leafy vegetables and recommends farmers cultivate fields farther from expressways.

Chethika Gunasiri Wadumestrige Dona, Geetha Mohan, Kensuke Fukushi · Sustainability · Global

This systematic literature review analyzed 54 articles on urban agriculture, examining socio-economic context, agriculture models, opportunities, and challenges. The review found that academic literature favors community gardens in developed countries and gives comparatively less attention to identifying challenges, benefit groups, and government support for urban agriculture.

Carlos Tapia, Linda Randall, Shinan Wang, Luciane Aguiar Borges · Sustainable Cities and Society · Denmark (Aarhus)

This study presents a novel indicator-based evaluation framework for urban agriculture, tested in Fællesgartneriet Brabrand, a community garden in Aarhus, Denmark. The framework aims to capture the contribution of gardening practices to urban sustainability, acknowledging that urban agriculture may also have social and environmental externalities depending on prevalent farming practices.

Victoria Schoen, Chris Blythe, Silvio Caputo, Runrid Fox-Kämper, Kathrin Specht, Agnès Fargue‐Lelièvre, Nevin Cohen, Lidia Poniży, Konstancja Fedeńczak · Frontiers in Sustainable Food Systems · Global North

This 2021 paper, based on data collected in summer 2020 from five Global North countries (France, Germany, Poland, UK, USA), examined the effects of COVID-19 on urban farms and gardens. The pandemic presented multiple challenges, including loss of support services, lost income, and reduced output due to labor supply issues. It also created opportunities like new local markets and increased community cohesion, demonstrating how gardens adapted to become more resilient.

Yang Deng · Journal of Hazardous Materials Letters · Global

While rainwater harvesting (RWH) is considered a sustainable irrigation method for urban agriculture, contaminants in rainwater pose challenges to RWH practices due to potential threats to crop, soil, and human health. Based on literature data, principal pollutants such as particles, toxic metals like cadmium, copper, and zinc, synthetic organic chemicals like agrochemicals and polycyclic aromatic hydrocarbons, and waterborne pathogens were identified as likely exceeding irrigation quality criteria. This study identifies challenges, knowledge gaps, and research needs for RWH irrigation, offering a basis for technical strategies.

Christine Costello, Zeynab Oveysi, Bayram Dündar, Ronald G. McGarvey · Environmental Science & Technology · United States (Chicago)

This study used optimization techniques to assess the land area and radius needed around Chicago, Illinois, to meet nutritional needs. It found that no mix of food items could satisfy vitamin D, B12, and calcium needs within a 650 km radius. While urban agriculture reduced the required radius by 10-15 km, significant nutrient fortification or supplementation was still necessary to localize the food system.