Research & reports

hawamkwela@yahoo.com MKWELA · Social Sciences & Humanities Open · Tanzania (Dar es Salaam)

This systematic review analyzed 42 studies from 1990 to 2024, examining urban agriculture practices, scale, socio-economic contributions, health and environmental impacts, and governance constraints in Dar es Salaam, Tanzania. Urban agriculture involves 36,000–60,000 households cultivating 1,800–6,000 hectares annually, supplying 90% of city vegetables, providing 20–70% of household income, and employing over 100,000 people. However, 85–95% of farmers lack secure land tenure, 78% of vegetable samples exceed WHO E. coli limits, and 90% of produce is sold informally with high post-harvest losses of 20–40%.

Malsha Samarasiri, Wei Ning Chen · Sustainable Microbiology · Global

This review discusses advances in urban mushroom farming, its integration with computer-based technologies, safety considerations, and the potential of mushrooms and mycelium-based foods as future foods. Key safety considerations for urban mushroom farming systems include biological hazards, mycotoxins, heavy metal accumulation, and potential allergenicity. Macrofungal mycelium-based foods may be regarded as novel foods and require evaluation under novel food safety regulations.

Michael J. Ormsby, Luke Woodford, James Joseph Mwesiga, Winnie Ernest, Dativa J. Shilla, Daniel Abel Shilla, Richard S. Quilliam · Environmental Pollution · Africa

This study investigated plastic debris as a reservoir for multidrug-resistant (MDR) enteric bacterial pathogens at two peri-urban agricultural sites in Dar es Salaam, Tanzania. Analysis of 140 environmental samples (soil, water, vegetation, plastic debris) showed higher concentrations of culturable pathogens on plastic debris, with presumptive E. coli loads of ~1 × 10^3 CFU per piece. Plastic debris harbored a greater proportion of MDR strains, including E. coli and K. pneumoniae resistant to critically important antimicrobials, indicating that plastic waste facilitates the survival of MDR pathogens and poses health risks.

Eric Vukicevich · Urban Ecosystems · Global

This paper describes a class-based soil testing project where undergraduate students partner with local community gardeners to investigate urban soil health. The project involves students examining soil properties such as pH, organic matter, nutrients, and toxic elements, and ensuring crop safety. Students develop project plans, interpret data, and make recommendations for soil management.

Malone M., Johnson B., Richard SI., Garcia N., Hamlin S. · Journal of Environmental Management · United States (Seattle)

Compares heavy-metal concentrations in vegetables grown in urban community gardens in the Seattle metropolitan area with produce from the grocery stores participants regularly used — a question set by the partnering farmers themselves. Metal concentrations frequently exceeded health guidelines in both, but were generally higher in the community-garden produce. Cadmium and lead posed the greatest risk and may exacerbate health risks for some populations.

Robert J. Moriarity, Meaghan J. Wilton, Eric N. Liberda, Tim Drew, Ada John, Howard Jeddore, Atanu Sarkar, Jim D. Karagatzides, Leonard J. S. Tsuji · Journal of Agriculture Food Systems and Community Development · Canada (Newfoundland)

This study aimed to develop safe community garden sites in Miawpukek First Nation, Newfoundland, Canada, addressing potential soil contamination. Soil testing revealed inorganic arsenic levels exceeding Canadian agricultural guidelines. Hügelkultur-style raised beds with imported soil were used, resulting in undetectable arsenic in potatoes grown there, while potatoes from contaminated soil exceeded safety limits. Kale grown in both raised beds and native soil remained within safety limits.

Godswill Ntsomboh Ntsefong · IntechOpen eBooks · Global

This chapter examines the global growth and implications of urban agriculture. While urban agriculture enhances food security, it also introduces food safety risks from contaminated soils and infrastructure gaps. Challenges related to heavy metals, waste, and inadequate land planning are evaluated, and barriers such as land access and limited training for producers persist.

Christian Valderrama, Hernan Zarate · Ambiente & sociedade · Colombia (Neiva)

This research characterized the presence and spatial distribution of lead (Pb) concentrations in Mangifera indica and Syzygium malaccense fruit trees on public roads in Neiva, Colombia. Using a census, fruit sampling, and spatial interpolation methods, lead levels were detected in all samples. Five samples exceeded the permissible limit of 0.1 mg/kg, with higher concentrations observed in industrial areas.

Peng Gao, Shuochen Xiao, Fara Diva Mustapa · Climate Risk Management · Global

This comprehensive review synthesized research on urban and peri-urban agriculture (UPA) globally, specifically within the context of its advantages, challenges, and climate change mitigation and adaptation efforts, including technological innovations and policy frameworks. The review demonstrated UPA’s ability to advance social interactions, improve urban microclimates, mitigate the urban heat island phenomenon, and provide essential ecosystem services. However, UPA is limited by scarce land resources and soil contamination, along with water management challenges and regulatory frameworks.

Ebenezer Boahen · Discover Agriculture · Ghana

This study assessed the awareness and practices of 50 purposively selected vegetable farmers along the Accra-Tema Motorway, Ghana, regarding heavy metal contamination from vehicular emissions and its potential health implications. Data were collected through structured questionnaires and one-on-one interviews. Results showed that 96% of the farmers were unaware of heavy metal contamination, though 80% expressed a willingness to discontinue farming near the motorway if they were informed of the risks. Farmers face challenges such as limited access to clean irrigation water and dependence on informal agricultural knowledge. The study highlights the urgent need for targeted educational interventions to raise awareness about the risks of heavy metal exposure and to encourage safer farming practices.

K I Safitri, Oekan S. Abdoellah, Budhi Gunawan, P Parikesit · Ethics in Science and Environmental Politics · Global

This qualitative study investigated the commercialization of urban agriculture and its influence on agricultural practices and environmental ethics, engaging 43 participants through observation, interviews, and documentation. Findings showed that global commercialization promotes policies for environmental sustainability, leading to aligned production methods. However, in local contexts, farmers cultivating sloped land without perennial crops often use artificial inputs and contaminated irrigation water, facing constraints from intermediaries.

Yizhou Peng, Grigorieva Iya Yu · Ecological Indicators · China (Chengdu)

This study assessed heavy metal pollution in rural, urban-rural interface, and urban agricultural lands in Chengdu, China. It found varying degrees of heavy metal pollution across all areas, with arsenic (As) and cadmium (Cd) being the most severe pollutants. Concentrations of As and Cd in soil samples exceeded risk thresholds, and these elements showed high spatial variability, indicating significant anthropogenic influence. Pollution sources included livestock manure, natural sources, agricultural activities, and industrial activities in urban areas.

José Luis Chaves, Alexandre Boleira Lopo, G. M. OLIVEIRA, J. F. ARAÚJO, Luciano Sérgio Ventin Bomfim, J. A. CASTRO · Editora Científica Digital eBooks · Global

This systematic review investigated the viability of animal production in urban and peri-urban agriculture as a tool for food security, using the PRISMA methodology. The review found that while this practice offers benefits like domestic food security and income generation, it also presents negative aspects such as odors, noise, and the transmission of zoonoses. Public policies are needed to regulate the activity and minimize health risks.

Lee D. Bryant, Roy Maconachie, Bastian Schnabel, Abubakarr Swaray, Howard Gigi, Solomon Gbanie, Kabba Haroun Bangura, Anthony Kamara, Prince Antwi-Agyei · Water Science & Technology Water Supply · Sierra Leone (Freetown)

This paper examined the environmental health status of three urban and peri-urban agriculture (UPA) sites in Freetown, Sierra Leone. Qualitative and quantitative data revealed heavy metal concentrations significantly exceeding regulatory limits in sweet potato leaves and arable soil. Additionally, soaring levels of faecal coliform bacteria were found in irrigation water, and crops were identified as hyperaccumulators for environmental contaminants.

Anushi Anushi, A. Krishnamoorthi, Jitendra Chaurasia, Bijay Kumar Baidya, Abhishek Singh, ­ Sapna, Vijay Kumar, Anushka Singh · Journal of Scientific Research and Reports · Global

This review explores the historical evolution and diverse models of urban farming, highlighting their contributions to food security, environmental sustainability, and community resilience. Challenges faced by urban farmers include limited space, soil contamination, regulatory hurdles, and access to resources.

Moussa Coulibaly · International Journal for Advanced Studies and Research in Africa · Côte d'Ivoire (Korhogo)

This study in Logokaha, Korhogo, Côte d'Ivoire, aimed to show the impact of urban agriculture on food production and the health of farmers. Despite contributing to the empowerment of farmers, urban agriculture exposes them to health hazards. The methodology involved documentary research and field surveys.

COULIBALY Moussa · International Journal of Advanced Research · Côte d'Ivoire (Korhogo)

This study in Korhogo, Côte d'Ivoire, surveyed 81 farmers to assess the impact of urban agriculture on food production and farmer health. It found that urban agriculture, predominantly practiced by women (85.19%) with no formal education (71.61%), involves the use of chemical fertilizers and pesticides with non-adherence to application intervals. A significant portion of farmers (59.26%) discard chemical packaging in the environment. Despite contributing to empowerment, this practice exposes farmers to health problems including fatigue (53.09%), injuries (25.92%), skin burns (11.11%), dry coughs/colds (32.10%), and diarrheal diseases (19.75%).

Mansi I. Bhati and R.K. Dubey · Zenodo (CERN European Organization for Nuclear Research) · Global

Urban horticulture, a new concept for growing family-sufficient food in urban and peri-urban areas, is gaining importance. However, environmental challenges for urban farming in urban environments include soil contamination, micro-climate alteration and air pollution, and contaminated water resources. Appropriate guidelines for urban and peri-urban agricultural practices are required.

Rajat Kumar · Ecology Economy and Society–the INSEE Journal · India (Delhi)

This paper investigates the toxicity in river water in the Yamuna khadar floodplains in Delhi, India, caused by pesticides and fertilizers used in agriculture. The study examines how this toxicity is perceived, discursively constructed, and dealt with by differently located stakeholders. It finds that stakeholders in the Yamuna khadar do not experience pollution as a homogeneous community, nor do they all perceive themselves as suffering from or contributing to the toxicity in a similar way.

Claudia Marcela Puerto Layton · Interdisciplinary Journal of Environmental and Science Education · Colombia

This article reports the systematization of an experience with home/school gardens in an educational institution in Bogotá, involving high school students (seventh and eighth grades) in face-to-face and remote modalities. Results include the reconstruction of the strategy and didactic process, highlighting aspects that affect or support the educational process in each modality. Reflections with students indicated that while home gardens can contribute to food security, pesticides can pose a risk to food security in Colombia.

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.

Moisés Savian, Mari Inês Caríssimi Boff, Pedro Boff · Cadernos de Agroecologia · Brazil

This study evaluated Brazilian scientific production from 2009 to 2018 on urban agriculture's contribution to food and nutritional security, analyzing 34 selected articles out of 612. It found that while agrobiodiversity is present in urban agriculture areas, pesticide use is a reality in some crop plots. The research suggests urban agriculture must be based on agroecology to avoid environmental contamination and produce healthy food.

Kouassi Joseph Kouakou, Ahoua Edmond Sika, Seu Jonathan Gogbeu, Koffi Bertin Yao, M. Bounakhla, Denézon Odette Dogbo, Yves‐Alain Bekro · · Africa

This study compared the accumulation potential of five trace metals (cadmium, copper, lead, zinc, and nickel) in lettuce, spinach, and amaranth grown at market gardening sites in Abidjan, Côte d’Ivoire. Using principal components analysis, it was found that lettuce had a greater capacity for accumulating these metals compared to spinach and amaranth. Amaranth and spinach from the three sites showed nearly identical metal accumulation capacities.

Muhammad Asif Khan Rai Muhammad Amir · International Journal of Biosciences (IJB) · Pakistan (Faisalabad)

To investigate heavy metal residue levels in cauliflower grown in the peri-urban area of Faisalabad district, Pakistan, 30 cauliflower samples were collected from 10 selected farmers. Analysis revealed variable heavy metal residue levels (nickel, lead, zinc, copper, arsenic, and mercury) in the samples, indicating that the cauliflower was contaminated with multiple heavy metals. This contamination is attributed to the use of untreated sewage water for cultivation, which is the single largest contributor to heavy metal accumulation in cauliflower.

Katyelle Rafael, Ariella Andrade Marchioro, Cristiane Maria Colli, Bruna Tiaki Tiyo, Fernanda Ferreira Evangelista, Renata Coltro Bezagio, Ana Lúcia Falavigna-Guilherme · Transactions of the Royal Society of Tropical Medicine and Hygiene · Brazil

This study genotyped Giardia duodenalis in raw-eaten vegetables (crisp lettuce, regular lettuce, kale, chicory, and rocket) sampled from street markets and community vegetable gardens in an urban area of southern Brazil. Researchers analyzed 130 samples from street markets and 130 from community gardens (260 total), washing them in Tween 80 solution, filtering through a cellulose acetate membrane, amplifying the GDH gene by semi-nested PCR, and genotyping positive samples by PCR-RFLP. 7.3% (19/260) of samples tested positive for G. duodenalis, from both street markets (10/130) and community gardens (9/130), including both organic and non-organic products. Assemblage AI predominated, but assemblages B and E, which carry zoonotic potential, were also found. The study concludes this points to a need for investigating commercially sold raw vegetables and establishing stricter quality control.