Research & reports

Darrow S., Kathi S., Liebe R., Cline L.L., Moss J.Q. · Urban Agriculture & Regional Food Systems · 米国オクラホマ州（農村・都市・近郊）

Oklahoma's specialty crop sector is in decline — vegetable operations fell from 799 in 2007 to 482 in 2022 — yet regional fruit and vegetable producers remain the primary supply foundation for farmers' markets, food hubs and direct retail serving urban and peri-urban communities, so producer viability is itself an urban food access and public health concern as food deserts expand. Five semi-structured focus groups with 29 experienced producers from rural, urban and peri-urban Oklahoma were analysed by open coding thematic analysis in NVivo, with saturation confirmed iteratively and rigour established through member-checking, peer review of codes and field note triangulation. The 180 initial codes were organised into 10 parent codes and three themes: the countercultural philosophy of production, the lack of accessible resources, and industry barriers preventing development — compounding disadvantages at cultural, institutional and structural levels. The authors call for a statewide local food system plan, a growers' association and dedicated local-food-system extension roles.

Imran Ali Lakhiar, Haofang Yan, Tabinda Naz Syed, Chuan Zhang, Sher Ali Shaikh, Md Rakibuzzaman, Rahim Bux Vistro · Horticulturae · Global

A systematic review of soilless farming (SLF) systems globally identified their role in enhancing horticultural resilience in urban and peri-urban settings. SLF offers advantages like water conservation and increased yield, but faces significant challenges. High setup costs, substantial energy demands, and the requirement for specialized technical expertise continue to limit its widespread adoption.

Zhongxue Zhou, Fangze Zhao, Bingjie Song · Ecological Indicators · China

This study proposed the concept of agricultural comprehensive ecological effects (ACEE), developed an evaluation framework, and applied it to the Xi'an metropolitan zone, China. A key finding was the observed decrease in the comprehensive ecological effects of agriculture when transitioning from grain planting to urban agriculture due to unsuitable agricultural practices in urbanizing areas. This decline occurs because modern agricultural practices in urbanizing areas are ecologically detrimental compared with natural ecosystems.

Limachi Pérez, Vicente · Macedonian Journal of Medical Sciences (University of Skopje) · Bolivia (Cochabamba)

This study examined the influences of family, school, and sociodigital networks on environmental awareness among secondary school students in urban and rural Cochabamba, Bolivia. Data from three schools showed students' environmental concerns varied by region, and the internet was their primary information source. Despite isolated initiatives like school gardens, schools did not effectively integrate environmental education into the curriculum, limiting its formative impact.

Liu Xinyun, Zhao Jianya, Zhang Yanglan, Wang Shu · Rural and regional development · China (Guangdong)

A study using 2017–2022 panel data in Guangdong Province, China, investigated urban agriculture's (UA) contribution to food self-sufficiency in highly urbanized regions. By categorizing cities by urbanization rate and analyzing spatial-temporal patterns in grain, vegetable, and fruit self-sufficiency, findings showed critically low grain self-sufficiency in high-degree urbanized cities. Despite incremental gains in UA productivity, urban yields for grains and vegetables lagged behind non-urban areas, indicating a limited contribution.

Marvin Joseph F. Montefrio, Nathalie Dagmang · The Journal of Peasant Studies · Philippines (Metro Manila)

This article examines two cases of radical urban agriculture in Metro Manila, Philippines, where urban poor communities strive for food sovereignty and assert rights over contested urban lands. It highlights that the spatiality of material constraints in cities acts as a mediating factor, influencing the formation of rural-urban alliances and the sustainability of urban resistance efforts. The study reveals challenges in establishing and maintaining these alliances due to urban material limitations.

Ayari G. Pasquier Merino, Simone Buratti · · Mexico (Mexico City)

This study analyzed the conditions and challenges in the logistics of transporting merchandise from production areas to commercialization spaces, using a case study of Mexico City’s peri-urban agricultural producers. Qualitative research, conducted from 2019 to 2022, involved 60 interviews with production and distribution project managers, a discussion workshop on transportation issues, and visits to production and distribution spaces. Results indicate that infrastructure and logistics for goods transportation are a key issue for the successful integration of small, peri-urban producers into urban markets. It was suggested that transport and logistics must be addressed for these producers to become viable economic actors.

Popov, Velian · reposiTUm (TU Wien) · Bulgaria (Plovdiv)

This study examines the disappearing phenomenon of informal urban gardening, known as Rancho, in Plovdiv, Bulgaria, focusing on its socio-historical factors. Despite its authentic, decades-long existence, Rancho is neglected and considered outdated, with a lack of legal regulation and its informal character endangering its future. The study proposes a gradual transformation of these areas into community urban gardens with new infrastructures to raise awareness and encourage authorities to reintegrate Rancho into the urban context.

Elias Nuwagaba, Murindwa Rutanga · East African Scholars Journal of Education Humanities and Literature · Uganda (Mbarara City)

This study explored how state-initiated, unplanned urbanization in Mbarara City, Western Uganda, affects the sustainability of urban farming and urban livelihoods. The research found that rapid, haphazard urban expansion, lacking strategic planning, has led to significant challenges. These include the emergence of slums, illegal land occupations, destruction of wetlands and riverbanks causing water pollution, and inadequate waste management, all negatively impacting public health and urban farming sustainability.

Moschella Miloslavich, Paola · Portal de Revistas PUCP (N/A) · Peru (Cajamarca)

This study in Cajamarca, Peru, analyzed the expansion of the city onto vital agricultural land, examining perceptions, consequences, and solutions through surveys and interviews. It found that weak regulations and external factors accelerate informal subdivision of rural properties, leading to future urban areas lacking public spaces and services. Despite high regard for agricultural land, comfort and the land market override beliefs in decision-making, and initiatives to protect the valley were unsuccessful due to permissive regulations and a lack of political will.

M Mohan Joseph, Archana T. Anil · Environmental Quality Management · India (Kochi)

This study evaluated spider webs from Cyrtophora cicatrosa and Pholcus phalangioides as biomonitoring tools for heavy metal pollution in urban, industrial, and semi-urban/agricultural areas of Kochi city, India. Analysis of web samples revealed site-specific variations in Cr, Cu, Mn, Mo, Ni, Pb, Sn, and Zn concentrations, with high levels of Zn found in Eloor (7558 ppm) and Kizhakkambalam (4947.50 ppm). Zn and Sn were the dominant accumulated metals, indicating significant heavy metal contamination in these environments.

Taffere Addis, Sisay Ketema, Abayneh Melaku · Frontiers in Water · Ethiopia (Addis Ababa)

This study in Addis Ababa, Ethiopia, investigated trace metal levels in sediment, soil, and irrigated vegetables from farms along the Akaki River, evaluating public health risks. Sediment levels of arsenic, chromium, copper, nickel, lead, and zinc exceeded threshold effect levels. Soil levels of arsenic, chromium, copper, manganese, and zinc exceeded typical world soil values, with nickel at one site exceeding EEC limits for agricultural soils. Critically, arsenic, lead, and zinc levels in some vegetable samples were above WHO allowable limits, despite soil levels being acceptable, and cadmium was the most accumulated metal in vegetables.

Joshua Zeunert, Scott Hawken, Josh Gowers · Land · Australia (Sydney)

A critical GIS analysis was conducted for Sydney and neighboring regions in NSW, Australia, to understand and advocate for Sydney's food production capacity. The study challenged the notion that Sydney's metropolitan landscape has low inherent biophysical quality for agriculture. Despite current metropolitan planning policy that marginalizes agricultural productivity, datasets revealed western Sydney is biophysically well suited for agriculture. Sydney's overall agricultural capacity was found to be comparable to five of six other coastal regions of NSW and superior to at least two, challenging current planning orthodoxy and policy.

A. Bayat, H. Govera · Suid-Afrikaanse tydskrif vir landbouvoorligting/South African journal of agricultural extension · South Africa (Cape Town)

This study descriptively investigated the vulnerability to shocks and pressures of the Philippi Horticultural Area (PHA), a key urban food-producing region in Cape Town, South Africa. Data were collected through surveys with stakeholders from government, the private sector, NGOs, private individuals, and informal settlers. Key findings revealed insufficient governance commitment, a lack of multi-stakeholder collaboration, and the growing threat of urban development on agricultural land.

Sarah Steinegger, Nora Katharina Faltmann · Journal of Political Ecology · Switzerland

This qualitative research examined the challenges consumers and farmers face in establishing proximity within a Community-Supported Agriculture (CSA) initiative in Switzerland that links rural mountain and urban areas. The study found that consumers and farmers are facing challenges in establishing proximity. Nevertheless, shared experiences of farming activities and social events, along with participants' willingness to improve CSA operations and strengthen ties for mutual understanding and joint efforts, contribute to the ongoing process of establishing proximity.

Henry Mensah · City and Environment Interactions · Ghana (Kumasi)

This study investigated adaptation practices and challenges among 85 urban farmers across three locations in Kumasi, Ghana. Farmers employed strategies like planting local crop varieties, expanding farms, and relocating. However, these strategies are hindered by institutional and technological limitations, financial constraints, lack of climate information, and delays in extension support, indicating significant governance challenges.

Joyce dos Santos Saraiva, Caio Cézar Ferreira de Souza, Maria Lúcia Bahia Lopes, Helena Lúcia Zagury Tourinho, Marcos Antônio Souza dos Santos · Revista de Gestão Social e Ambiental · Global

This study, using a systematic literature review with the PRISMA method, investigated whether distinctions between urban and rural agriculture justify "urban agriculture" as a specific category. The analysis revealed a lack of consensus among authors, with a predominant understanding that there are not two distinct types of agriculture, but rather the same activity carried out in different spaces, which questions the validity of the term "urban agriculture."

Peter Nixon, Anu Ramaswami · Environmental Research Letters · United States

This paper quantifies environmental benefits and disbenefits from various vegetable farming localization scenarios across 378 US metropolitan areas. While scenarios found few significant land constraints and revealed net environmental benefits to groundwater overdraft and fertilizer-related PM2.5 emissions in 11%–55% of metros, the model also revealed where relocalization would exacerbate existing environmental vulnerabilities. This indicates potential environmental tradeoffs depending on the location.

Stella Kasiva Mbiti, Micah Makworo, Brenda Waruinu Githinji, Christine Sabwa · · Kenya

This study explored the inter-linkages of urbanization, climate change, and food insecurity in Kiambu Sub-County, Kenya. Findings show urbanization leads to dramatic land use changes, diminishing agricultural land, and exacerbated climate risks and food insecurity. The study identified institutional weaknesses, poor planning, limited regulatory frameworks, and political interference as key drivers of unsustainable urban growth and reduced food production.

Katja Hombrecher · Gefahrstoffe Reinhaltung der Luft · Germany

A pilot study in Germany investigated the impact of road traffic emissions on food plants grown near roads. Bioindicators like kale, chard, Lollo Rosso, and lettuce were exposed for four weeks at four roadside locations and compared to plants in a garden away from roads. While pollutant levels generally did not exceed background or EU maximum limits, significant traffic-related inputs of PAK 4, antimony, aluminum, chromium, and vanadium, and lesser inputs of copper, iron, and lead were detected compared to the control. The findings indicate a potential contamination risk for certain vegetable plants from road traffic.

Average Chigwenya, Samson Gwamure · Kuveza neKuumba The Zimbabwe Ezekiel Guti University Journal of Design Innovative Thinking and Practice · Zimbabwe (Masvingo City)

This research examined how urban agriculture has been incorporated in Masvingo City, Zimbabwe. A mixed methods approach, including interviews with key informants and field observations in urban agriculture areas, was adopted. The research found that despite the widespread practice of urban agriculture, Masvingo City is not innovative in including urban agriculture in its development agenda.

Yuanchao Hu, Prajal Pradhan, Haoran Zhang, Zhen Wang, Qianyuan Huang, Qiqi Jia, Xihong Lian, Chao Xu, Rui Yang, Yuxi Tian, Zhibang Xu, Limin Jiao, Jürgen P. Kropp · Resources Environment and Sustainability · China

This study constructed a new dataset of urban productive spaces for 124 large Chinese cities to assess the potential of urban agriculture. It found that approximately 30% of urban vegetable demand could be met by utilizing spaces such as rooftops and open areas. However, urban agriculture showed little potential for greenhouse gas emission mitigation, with an average intensity (0.30 kgCO2e/kg) similar to traditional agriculture (0.31 kgCO2e/kg).

Kyla D. Schulte, Caleb J. Wilson, Anna Tawril, Mary A. Jamieson · Ecosphere · United States (Michigan)

A three-year study across 10 strawberry farms along a rural-urban gradient in Michigan, USA, characterized bee abundance, diversity, and community composition. The study found that urbanization, measured as impervious surface cover, had no consistent effect on overall bee abundance and diversity. While urbanization differentially influenced specific taxa (Halictini positively in year one, Ceratinini negatively in year three), the overall impact was limited, with wild bees, especially native species, being important pollinators in urban agriculture.

Tuem Gebre Abraha, Haftom Teshale Gebre · PLoS ONE · Ethiopia

This study assessed the performance and challenges of 373 micro and small enterprises, including 1073 urban agriculture operators, in Fireweyni town, Ethiopia, using a mixed-methods approach and survey data from 5483 operators. The results revealed that financial control, marketing strategy, managerial expertise, government regulations, and business information services significantly affect the performance of these businesses. Many micro and small enterprises in the country face significant challenges and exhibit deteriorating performance, with limited progression.

Alex Barimah Owusu, Collins Adjei Mensah, Clement Kwang, Gerald Albert Baeribameng Yiran, Ronald Reagan Gyimah, Dominic Edem Hotor, Princella Ofori Darko · International Planning Studies · Ghana

This paper analyzed the replacement of green spaces with brown spaces in Accra, Ghana, from 1991 to 2021 using Landsat satellite images. Brown areas increased from 24.5% in 1991 to 81% in 2021, while green areas decreased from 75.5% to 19% during the same period. The study found a significant reduction in green spaces due to urbanization.