Research & reports

Emmanuel Yennumi Wandaat, Joseph Xorse Kugbe · Asian Journal of Agriculture and Food Sciences · Ghana

A study on vegetable production in Ghana's Tano South District surveyed 132 urban farmers and 5 stakeholders. Farmers relied solely on chemical pesticides for pest control and lacked in-depth knowledge of Integrated Pest Management (IPM). Inappropriate handling and non-use of protective clothing led farmers to report health issues like dizziness, skin irritation, and nausea, while indiscriminate spraying resulted in pesticide residues posing serious health risks to consumers and the environment.

Leonia John Raphael · Tanzania Journal for Population studies and Development · Tanzania (Dar es Salaam)

A 2015 study in Dar es Salaam, Tanzania, found that extreme climatic changes, including rainfall and temperature, have adversely affected peri-urban agricultural productivity and vegetation cover. Excessive rains lead to the destruction of urban gardens, vegetation, property, and loss of livelihoods for urban dwellers, 87% of whom are rural migrants. This highlights significant risks for urban communities dependent on land resources in rapidly growing cities.

Klaus Lorenz · Soil Science · Global

Urban agriculture (UA) engages approximately 800 million people globally and covers over 67 million hectares of urban cropland. While UA contributes to food security, growing food in urban ecosystems, particularly on degraded urban soils, presents challenges. Past research on UA has focused on social sciences, and although studies on urban soils have increased, many urban areas remain neglected. Further research and dissemination of knowledge are needed on how to maintain or enhance urban soil fertility through soil and land-use management practices.

Pei Xin Koh · DR-NTU (Nanyang Technological University) · Singapore

This study aimed to verify the viability of vertical farming systems with LED supplementary light compared to conventional hydroponic farming systems, focusing on energy consumption, cost, plant growth quality, and yield. Experiments with Butterhead lettuce showed that LED lights contributed 90.12% of the total energy consumption in the vertical farming setup. The commercial viability and realistic cost levels of vertical farming have not been established, and a detailed cost-benefit and energy-benefit analysis is yet to be made.

Guy M. Robinson, Zhiling Liu · AIMS environmental science · Australia

This paper examines the contradictions between greening and "ungreening" in Adelaide, South Australia, focusing on the city's Park Lands and urban sprawl. It argues that urban sprawl, including recent development on prime farmland, has been antithetical to biodiversity maintenance and greening principles, reducing sustainability capacity. The paper identifies problems such as conflict between biodiversity and protecting residents in bushfire risk areas, stemming from a relaxed attitude towards low-density expansion.

Jenny Sjöblom · · Sweden

This study describes the origin and development of Community Supported Agriculture (CSA) in Sweden, identifying and interviewing organizations and entrepreneurs. While CSA is nascent but growing, with prerequisites for expansion in both rural and urban areas, the study notes implications regarding its accessibility to the broader population that require further exploration.

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.

Marzieh Rezaei Qaleh, Hossein Medi, Mahdi Sheybani · Cumhuriyet Science Journal · Iran (Qazvin City)

This study investigated the role of urban agriculture in sustaining the urban environment, using Qazvin City, Iran, as a case study. Qazvin City, historically surrounded by traditional gardens that created a favorable urban environment, is now experiencing the destruction of these garden environments due to development processes, posing a risk of breaking the chain of environmental sustainability. The research, based on content analysis through observation and document study, proposed solutions considering environmental concerns, including preserving old irrigation methods, restoring native plant species, and focusing on existing water resources.

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.

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.

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.

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.

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.

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.

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.

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).

Zogo Ndomo, Yannick Emmanuel · Bulletin of animal health and production in Africa · Global

Urban agriculture in developing countries is a vital asset in the livelihood strategies of urban households, having expanded rapidly over the last two decades and contributing to income generation for unqualified workforces. However, the illegal status of urban agriculture has created a governance vacuum, necessitating policy formulation and institutionalized management to secure land for the urban poor and improve food security and the environment. Political leaders have a role in regulating this sector.

Rafaela Soto Ortíz, Michael Peña Smith, Idia Concepción, Islay García Hernández · Revista Científica Agroecosistemas · Cuba (Cienfuegos)

In Cienfuegos province, Cuba, limiting factors and seed production quality were identified through a non-experimental, longitudinal study from 2001 to 2012. The investigation revealed a decreasing trend in seed production levels and genetic erosion at the Company of Several Seeds in Cienfuegos, with basic seed categories declining and producers lacking necessary knowledge. Productive infrastructure, resource availability, climate change impacts, and insufficient knowledge were identified as key limiting factors.

Dorottya Szabó, Szabó, Dorottya · AgEcon Search (University of Minnesota, USA) · Hungary

This study examines the situation of short supply chains (SSC) in Hungary. It highlights that developing SSC in Hungary is not an easy task, as small farmers typically have weak cooperation and lobbying skills. While traditional direct marketing is common, innovative forms of SSC are rare.