Research & reports

Giuseppe Cinà, Francesco Di Iacovo · PORTO Publications Open Repository TOrino (Politecnico di Torino) · Italy

This paper examines urban and peri-urban agriculture (UPA) in Italy, identifying challenges in its planning, including the traditional exclusion of agricultural areas from territorial planning and the lack of local agricultural policy. The study highlights a disconnect between top-down policies and bottom-up practices, noting that numerous autonomous initiatives have emerged due to insufficient regional and local planning solutions. The authors conclude that overcoming the limitations of the top-down planning system, particularly in governance and inclusiveness, is a primary challenge for Italy.

Susmita Dasgupta, Asif Zaman, Subhendu Roy, Mainul Huq, Sarwar Jahan, Ainun Nishat · · Bangladesh (Dhaka)

A study on flood mitigation in Dhaka explored complementary measures to existing drainage systems and discussed institutional, technical, and financial challenges to their implementation. A commonly acknowledged challenge for Dhaka is the lack of coordination among agencies, exacerbated by scarce resources and unplanned development. Clogging of stormwater drains with solid waste was identified as a primary reason for frequent localized flooding, and issues with khals (canals) regarding water flow, encroachment, and walkways were also noted.

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.

Guo Xiao-ha · Anhui nongye kexue · Global

A discussion of the development of Community Supported Agriculture (CSA) in China. While CSA has advantages over traditional agricultural production and sales models, the paper identifies limitations including heavy demands on labor and material resources, higher prices for agricultural products, difficulty building trust between producers and consumers, and loss of membership.

Baltazar M.L. Namwata, Idris S. Kikula, Peter A. Kopoka · Journal of African studies · Africa

A study examined urban farmers' access to land, water and inputs for urban agriculture toward household food security, employment creation and income generation in Dodoma municipality, Tanzania. A cross-sectional survey of 300 urban farmers from both squatter and non-squatter settlements used structured questionnaires, focus group discussions, key informant interviews, observations and documentary review. The analysis found urban farmers constrained by land tenure insecurity, erratic water access, inadequate inputs for optimizing plot productivity, and ambivalent application of urban legislative frameworks, with no support given to enable urban farmers to access land, water and inputs. The apparent lack of political will necessary to promote such access is reflected in weak or absent policy frameworks, resulting in an enormous capacity deficit.

Lydia G. Marquez‐Bravo, Dean B. Briggs, Hannah A. Shayler, Murray B. McBride, Donna Lopp, Edie B. Stone, Gretchen Ferenz, Kenneth G. Bogdan, R. G. Mitchell, Henry M. Spliethoff · Environmental Toxicology and Chemistry · United States (New York City)

A study analyzed 69 soil samples from 20 community gardens in New York City for 23 polycyclic aromatic hydrocarbons (PAHs) and black carbon, sampling both non-growing areas and vegetable-growing beds, including beds with and without visible PAH sources, at each garden. The sum of the US EPA's 16 priority PAHs reached up to 150 mg/kg, with a median of 5.4 mg/kg and mean of 14.2 mg/kg, similar to levels previously reported for urban areas in the northeastern United States. Isomer ratios indicated petroleum, coal and wood combustion as the main sources, and PAH concentrations were significantly and positively associated with black carbon and modeled air PAH concentrations, suggesting a link between historical atmospheric deposition and current soil PAH levels. Median PAH concentration in non-bed areas (7.4 mg/kg) was higher than in beds from the same gardens (4.0 mg/kg) and significantly higher than in beds without visible PAH sources (3.5 mg/kg); beds in gardens with records of soil amendments had 58% lower median PAH concentration than beds in gardens without such records, suggesting that gardening practices in beds without visible sources contribute to reducing soil PAH concentrations.

Ricardo da Silva Claudio, Souto de Sousa J uacute nior Francisco, Ismael de Souza Francisco, da Silva Dias Nildo, Nogueira de Sousa Neto Osvaldo, Cruz Portela Jeane, Cl aacute udia Medeiros Souza Ana, Christina Nascimento Porto Vania · African Journal of Agricultural Research · Brazil

A participatory action-research project in a community garden in Bom Jesus, Campo Grande, Rio Grande do Norte, Brazil, tested irrigating organic vegetables (coriander, chive, tomato, rocket) with reject brine from a water desalination/treatment station. All species irrigated with the saline waste water showed yield losses of 25.30% to 26.7% compared with conventional fresh-water irrigation, though some biomass was still produced, and the project changed residents' views on disposing of and reusing the saline waste.

Benno Gammerl, Rainer Herrn · Goldsmiths (University of London) · Europe

A theoretical essay (in German and English, from a European context) on the tension between affect that disrupts ordered structures and the emotional processing of power-laden spatial relations. It uses practices of urban gardening and debates about gentrification as its examples, arguing that analyzing the dynamic interplay between spaces and emotions is fruitful for a critical view of urbanity - explicitly linking urban gardening practices to gentrification as an exclusionary dynamic.

Yang Feng-x · · China

A field investigation with detailed records examined the safety of park green spaces in major parks and community gardens in Shenzhen and Hong Kong, China. Measured against a "people-oriented" guiding principle and a "select the auspicious, avoid the inauspicious" principle, the study identifies several safety hazards and unreasonable plant arrangements present in these park green spaces as irrational, and proposes methods and countermeasures to address them.

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.

National Audit Office · National Audit Office (NAO) · United Kingdom

An investigation published by the UK National Audit Office on 29 October 2015. The children's charity Kids Company received at least £46 million of public funding over fifteen years, £28 million of it from the Department for Education. In 2008 it took 20 per cent of the funding available under one programme, and in 2011 it received over twice the amount given to any other grant recipient. Officials raised sustainability concerns in six separate briefings between 2002 and 2015, yet funding continued outside competitive processes; the charity closed insolvent on 5 August 2015 and around 1,900 cases were passed to local authorities.

Georgia Graham · Channel 4 News · United Kingdom

A fact-check on Kids Company, the charity founded in 1996 that operated in London and Bristol. It claimed to reach 36,000 children by 2015 and had received £46 million of public money over fifteen years — £44 million from central government, £28 million of that from the Department for Education. Its 2013 annual income was £23 million, 20 per cent from government and 77 per cent from private donations. The piece notes that government oversight relied on the charity's own self-assessments, with no independent verification of outcomes or beneficiary numbers.

Emily Gustafsson-Wright, Sophie Gardiner, Vidya Putcha · Brookings Institution · Global

A Brookings Institution report published on 9 July 2015 examining the 38 impact bond deals in existence as of 1 March 2015, with six more contracted by July. It defines impact bond structures, inventories existing deals, sets out policy frameworks and the motivations of each type of stakeholder, and tests the claims made for impact bonds. The authors express cautious optimism while stressing that the field remains nascent and needs greater transparency and continued research.

Chiara Tornaghi · Progress in Human Geography · Global

This paper defines the scope and an initial agenda for a critical geography of urban agriculture, noting that despite growing interest across disciplines, it remains a marginal field in human geography. Beyond rhetoric, urban agriculture raises questions for critical geographers, particularly regarding its role in reshaping urban landscapes and experimenting with alternatives to capitalist urban organization. The paper highlights that urban agriculture is sometimes establishing embryonic forms of recreating the Commons.

Melissa N. Poulsen, Marie L. Spiker, Peter J. Winch · Journal of Agriculture Food Systems and Community Development · United States (Baltimore)

This study explored the perceived importance of community buy-in for urban farming, along with its barriers, facilitators, and strategies, through participant observation at urban farms and interviews with urban farmers, neighborhood leaders, residents, and key stakeholders in Baltimore, Maryland. Findings revealed that residents' unfamiliarity with urban farming, concerns about negative neighborhood impacts, and perceptions of urban farms as "outsider projects" were barriers to buy-in. Strategies for gaining buy-in were shown to follow three main phases: gaining entry into a neighborhood, introducing the urban farm idea, and engaging the neighborhood.

David Adams, Michael Hardman, Peter J. Larkham · Local Environment · Global

This paper explores those affected by guerrilla gardening, noting that it often colonizes land without permission and transforms areas without consulting local communities. Grounding its argument in evidence from three guerrilla groups, the study investigates the public's views on several informal gardening projects. Responses were very mixed, ranging from positive comments about improving aesthetics to negative remarks surrounding the practices of some groups. Ultimately, the paper demonstrates that although often promoted as constructive, guerrilla gardening can result in adverse impacts on those who surround colonized sites.

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.

Harry Kasumba, Tabukeli Musigi Ruhiiga · Journal of Human Ecology · Global

This literature review explored the potential of Structural Path Analysis (SPA) for investigating urban agriculture. The review found that urban agriculture has not yet attracted scholarship using the SPA technique. It also identified that smaller geographical areas often lack applicable databases for SPA, and a critical requirement for SPA is a developed system of continuous record-keeping by participants, which is often absent.

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.

Suleiman Mkwela Hawa · Journal of Geography and Regional Planning · Tanzania (Dar Es Salaam)

This study assessed the governance of urban agriculture (UA) in Kinondoni Municipality, Dar Es Salaam City, Tanzania, through the perceptions of 24 local leaders. Unstructured interviews focused on leadership quality, infrastructure provision, and farmers' land rights. The leaders generally perceived limited efforts and plans to support UA in the municipality based on these criteria.

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).