Research & reports

Sheriden M. Hansen, JayDee Gunnell, Anthony Whaley, Xin Dai, Cole Harding, Brent Black · Horticulturae · United States

This study in the U.S. Intermountain West assessed eight tree species for their suitability as windbreaks for urban farms, focusing on initial establishment and use at the urban–agriculture interface. Standard poplar and 'Theves' columnar poplar were most effective for rapid establishment. However, species with moderate growth rates like aspen, juniper, and hackberry may offer lower long-term maintenance costs for the region's challenging environmental conditions.

Hayford Mensah Ayerakwa, Fred Mawunyo Dzanku, Daniel Bruce Sarpong · Agricultural and Food Economics · Ghana

Using a sample of 2,004 households in a small and a medium-sized city in Ghana, this study examined urban households' participation in agriculture by disentangling it according to the geography of production — urban versus rural areas — and its implications for food security. The analysis found no evidence that participation in agriculture in general was related to the food security of urban households in this sample. However, urbanites who produced food in both urban and rural areas had better food security in the medium-sized city.

Guillermo Olivera, Kenia Zavaleta · Repositorio Digital Institucional de la Universidad de Buenos Aires (Universidad de Buenos Aires) · Mexico

This study argues that urban and peri-urban agriculture (UPA), along with intra-urban open spaces, constitutes a "second best" land use for 21st-century cities pursuing sustainable growth aligned with the 2030 Sustainable Development Goals — whether through FAO's Greener Cities Strategy, which promotes garden-based UPA against poverty and food insecurity, or through UPA absorbed by city expansion, much of it commercial in nature. Based on analysis of official statistics and fieldwork in the Ejido Tejalpa in Cuernavaca, Morelos, Mexico, the study finds that UPA persists there due to its historical trajectory and access to water and land, existing in commercial form rather than as urban gardens, but not without problems. Its main threat is identified as excessive urbanization and generational change among producers, and its main challenge as achieving greater involvement of urban governments through land management and urban planning, following the experience of other countries where agriculture is given more weight in metropolitan planning.

Achamyeleh Gashu Adam · IntechOpen eBooks · Ethiopia

A case-study and desk-review analysis of how new urban built-up properties form in the transitional peri-urban areas of Ethiopia. These areas are described as sites of intense competition between agricultural and non-agricultural land use, where rural agricultural land rights are vanishing. The study finds that both formal and informal actors play a significant role in converting peri-urban agricultural land into non-agricultural urban built-up property, and that these properties result from land-use conversion through both formal and informal channels.

Jackline Gomes Silva, Maria Cleoneide Brito, Jerrana Cantarelli, Sebastião Santos, Paula Vanessa Queiroz, Lourinalda Luiza Dantas da Silva Selva de Oliveira · Revista de Agroecologia no Semiárido · Brazil

A report on SERTA (Alternative Technology Service), a Brazilian institution offering an agroecology technical course for rural and urban youth and traditional communities, describing a 30-hour internship experience of students from the Glória do Goitá unit at the Ibimirim unit in Pernambuco's semi-arid Sertão do Moxotó, in the caatinga biome, on a 5-hectare site with a range of native and exotic trees, shrubs, herbs and medicinal plants and a large variety of cacti. Activities included observing social technologies such as cactus-grafting techniques, animal and plant husbandry, use of high-protein, high-value medicinal and food plants such as moringa (Moringa oleifera) and pitaya (Hylocereus undatus), and participation in the "Caatinga Emoldurada" project making handcrafted lamps from dead plant material, as well as hands-on exposure to solar and wind energy use and to aquaponics combining fish, chickens, medicinal plants, fruit trees, vegetables and unconventional food plants (PANC).

Abraham Verghese, Rakshitha Mouly · Pest Management in Horticultural Ecosystems · India

A report documenting the giant African snail (Achatina fulica) in urban and terrace gardens in Bengaluru, India (12°57'N, 77°38'E, 965 MSL) over a six-month observation period, in peri-urban horticulture. Its occurrence in Bengaluru (formerly Bangalore) was first reported in 1979, more than a century after two specimens were introduced into a garden in Calcutta (Kolkata) by William Henry Benson in 1847, after which it is assumed to have spread across India and much of Asia; the paper cites the genetic closeness of current snail populations to the original Kolkata specimens as evidence for this spread.

Jessica Ann Diehl · Sustainability · Australia

Semi-structured interviews with 15 commercial urban farmers in Sydney, Australia, guided by questions based on the Sustainable Livelihoods Framework, examined how farmers access tangible and intangible resources through social networks within the urban food system. Three patterns emerged: urban-local, rural-local, and urban-global networks used in pursuit of sustainable livelihoods. The study concludes that land is only one driver, among many, of the sustainability of the local food system.

Cadaval Solà-Morales · On diseño · Mexico

A 2020 "On diseño" award jury statement assessed the CH-REURBANO project in the historic center of Mexico City. Three previously separate, abandoned buildings with differential foundation settlement were structurally unified by removing their central mass to create a shared courtyard that also functions as circulation and ventilation. The mixed-use program was legally justified by citing the buildings' prior history of varied uses in a zone where such mixing is normally restricted.

Laércio Stolfo Maculan, Vera Regina Tângari · Revista Nacional de Gerenciamento de Cidades · Brazil

This study examines how territory-structuring elements, including geophysical support, the Porto Alegre metropolitan region, development corridors and urban-industrial agglomerations, shaped the urban edge of Passo Fundo, a medium-sized city in southern Brazil (Rio Grande do Sul), between 2000 and 2018. It found the metropolitan region influences growth vectors, regional highways concentrate business establishments, and the city's edge hosts industrial and commercial activity alongside urban agriculture tied to the globalized agribusiness matrix.

Louis Amprako, Kathrin Stenchly, Martin Wiehle, George Nyarko, Andreas Buerkert · Insects · Ghana

In 36 fields around Tamale in Ghana's Northern Region, researchers used 72-hour pitfall and pan trap sampling to examine how different irrigation water sources shaped arthropod communities in urban and peri-urban agricultural systems. Among 14,226 specimens spanning 13 orders, 103 families, 264 genera, and 329 taxa, analyzed with non-metric multidimensional scaling and redundancy analysis, arthropods grouped by irrigation source, with dipterans -- notably the disease-vector eye gnat Hippelates pusio -- dominant under wastewater irrigation, three alien ant species indicating community shifts from invasive species, and seven ant species forming mutualistic relationships with aphids flagging a future risk of aphid pest outbreaks.

Jaekyoung Kim, Sang Yeob Lee, Junsuk Kang · Sustainability · South Korea

Using ENVI-Met simulation on the campus of Seoul National University, South Korea, researchers quantitatively analyzed how different rooftop garden arrangement patterns affected temperature reduction. Extreme and linear (longitudinal) configurations achieved the greatest maximum reduction at -0.3°C, while the checkerboard pattern achieved the lowest maximum reduction at -0.2°C, with the largest impact over broader areas occurring in the mornings rather than the afternoons.

Andrea Colantoni, Gianluca Egidi, Giovanni Quaranta, R. D’Alessandro, Sabato Vinci, Rosario Turco, Luca Salvati · Land · Europe

Using statistical data analysis and a literature review covering 1961-2017, a regional study in Greece examined the relationship between wildfire frequency/extent and the decline of nomadic livestock (mainly sheep and goats), comparing Attica — the peri-urban region that includes the capital Athens — with the rest of the country. Attica showed a markedly faster decline in nomadic livestock than the rest of Greece, a decline associated with higher wildfire risk in that region. The findings indicate that nomadic livestock grazing helps prevent fuel (biomass) accumulation in forests and unmanaged natural land, contributing to sustainable management of peri-urban land.

Małgorzata Ćwieląg‐Drabek, Agata Piekut, Klaudia Gut, Mateusz Grabowski · Scientific Reports · Europe

A study of family allotment gardens (FAGs) in Silesia Province, one of the most polluted regions in Poland, analyzed 219 soil samples and 64 edible plant samples to link the geochemical disturbance caused by past mining and smelting activity to consumer exposure to toxic and carcinogenic metallic trace elements. Contents of these elements in topsoil were spatially diverse and depended primarily on the location of industrial pollution sources. Average cadmium (0.52 mg/kg fresh weight) and lead (0.57 mg/kg fresh weight) content in vegetables exceeded maximum permissible concentrations under European quality standards. A human health risk assessment based on three dietary exposure scenarios found that, in every scenario, potatoes — a staple of the Polish diet — carried the highest average daily dose for all three elements. The study concludes that consuming vegetables grown in Silesia Province's family allotment gardens may pose a significant health risk to consumers.

Delphine Manka’abusi, Désiré Jean‐Pascal Lompo, Christoph Steiner, Mariko Ingold, Edmund Kyei Akoto-Danso, Steffen Werner, Volker Häring, George Nyarko, Bernd Marschner, Andreas Buerkert · Journal of Plant Nutrition and Soil Science · Sub-Saharan Africa

To quantify carbon and nitrogen losses in urban and peri-urban agriculture soils in West Africa, this study measured CO2-C, N2O-N, and NH3-N fluxes from irrigated fields in Ouagadougou, Burkina Faso, and Tamale, Ghana, under different fertilization and (waste)water regimes. Compared with unamended controls, fertilizer application increased average cumulative CO2-C emissions by 103% over eight cropping cycles in Ouagadougou and by 42% over seven cropping cycles in Tamale. Total emissions across all cropping cycles reached 14 t C/ha in Ouagadougou — 73% of the carbon applied as organic fertilizer over two years at that site — and 9 t C/ha in Tamale. Fertilizer application increased N2O-N emissions in Ouagadougou by 37-360% across cropping cycles and NH3-N losses by an average of 670%, but had no significant effect on N2O-N losses in Tamale. Wastewater irrigation did not significantly raise CO2-C emissions in Ouagadougou, but in Tamale CO2-C emissions were 71% higher on wastewater plots (1.6 t C/ha) than on controls (0.9 t C/ha); wastewater had no significant effect on N2O-N or NH3-N emissions at either site. Biochar did not affect N2O-N or NH3-N losses but could help reduce CO2-C emissions from urban garden soils.

Graciela Arosemena Díaz · · Spain

Focused on Spain, this text situates the current urban food supply system — reliant on agrochemicals, crop and animal production, processing, storage, and complex global transport networks with serious environmental impacts from fossil fuel use — as context for arguing that urban and peri-urban agriculture can reduce the food system's environmental impact and fossil fuel dependence while improving food security against economic and climatic vulnerability (2020). It notes that environmental justice is socially and politically complex, with groups of lower socio-economic status typically bearing a greater burden of environmental impacts, and cites as an example a city Council for the Protection of Nature that preserves the agricultural area along the Llobregat River and its agro-economic activity through an agricultural park.

Isaac Otieno Dawo, George Mark Onyango, Francis Ang’awa Okere · International Journal of Sciences: Basic and Applied Research · Africa

A cross-sectional survey of urban farmers in three towns in western Kenya — Eldoret (n=137), Kakamega (n=145) and Kisumu (n=158) — examining how local governance institutions' economic, social and environmental roles influence urban agriculture (UA) practice. A stratified sample of 205 respondents (63 in Eldoret, 68 in Kakamega, 74 in Kisumu) completed questionnaires and key-informant interviews. The department of agriculture, livestock and fisheries was identified as the most important institution promoting UA, cited by 64.8% of respondents in Eldoret, 42.2% in Kakamega and 40.0% in Kisumu. Pearson correlation showed a statistically significant moderate positive relationship between county government institutional roles and UA practice (n=205, r=.532, p<.05).

N. K. Fidelis, M. K. Winnie, W. K. Joyce, K. Juliana, Kotey Ashie Daniel, M. Scholastica, Mbijjiwe Jacob Kathure Catherine · Journal of Engineering in Agriculture and the Environment · Africa

In Nairobi, Kenya, stratified random sampling, field surveys and questionnaires were used to identify existing water sources and wastewater treatment systems and their reuse status, in an investigation of the potential for eco-friendly urban and peri-urban agriculture (EcoUPA). Of the 300 respondents interviewed, only 66 (22%) reused wastewater, and only 54 of those reused it for crop production. Ninety-eight respondents (33%) wanted information on wastewater treatment systems allowing reuse, and 124 (41%) were willing to pay for a new system. The findings indicate that limited urban water sources constrain the spread of urban and peri-urban agriculture.

Alexey Valerevich Vasilchikov · Eurasian Law Journal · Russia

A study of urban agglomeration development trends in the regions of the Russian Federation, drawing on analyses from various Russian sociological research schools, examines the differentiation between cities — including million-plus cities — competing for natural, demographic, financial, and investment resources. It finds that large agglomerations act as monopolists that in many cases hinder the successful development of medium-sized and especially small Russian cities, further worsening inequality in living standards and quality of life across localities throughout the Russian Federation.

Joseph Richmond Fianko, Mavis Korankye · West African Journal of Applied Ecology · Ghana

A study assessed the environmental and health impact of urban and peri-urban irrigated agriculture in Ghana by analyzing the physico-chemical and microbiological characteristics of irrigation water in the Greater Accra Region, calculating a comprehensive pollution index (CPI) and sodium adsorption ratio (SAR). Water samples used for informal irrigation contained significant microbial loads: total coliform ranged from 25×10² to 1209×10² cfu/100ml and E. coli from 2×10² to 651×10² cfu/100ml, with a mean total coliform level (517.917×10² cfu/100ml) far exceeding the recommended maximum guideline values of 5,000 and 1,000 cfu/100ml for irrigation water. CPI values ranged from 0.16 to 0.43 (average 0.27), indicating moderate pollution; about 42% of samples were classified as sodic waters, and SAR values of 3.42 to 24.75 meant nearly all samples exceeded the threshold (SAR > 4) associated with reduced water infiltration and soil permeability problems. The water is described as under persistent pollution pressure from expanding human activity, posing high risks to the health of the environment, farmers, traders, and consumers.

Mothership.SG · Mothership.SG · Singapore

This article reports that a tender for rooftop space on nine HDB multi-storey carparks in Singapore opened on 12 May 2020, closed on 16 June 2020, and results were announced on 30 September 2020. Nine sites (five standalone plus two clusters of two) were awarded to six operators; the article states the nine farming systems can potentially produce around 1,600 tonnes (1,600,000kg) of vegetables per year. The Singapore Food Agency (SFA) and Housing Development Board (HDB) were involved, and the project is framed as part of the '30 by 30' strategy to produce 30 per cent of Singapore's food locally by 2030.

Anna Margenat, Víctor Matamoros, Sergi Dı́ez, Núria Cañameras, Jordi Comas, Josep M. Bayona · Environment International · Spain (Barcelona)

A study assessed 16 trace elements and 33 organic microcontaminants in lettuce, tomato, cauliflower, and broad beans from peri-urban farms near Barcelona, Spain, and a rural site. Concentrations ranged from non-detectable to 17.4 mg/kg for trace elements and non-detectable to 256 μg/kg for organic microcontaminants, with tomatoes showing the highest levels. Risk assessment indicated a low human health risk from consuming these vegetables in the peri-urban area, comparable to the rural site.

Nolwazi Z. Khumalo, Melusi Sibanda · Sustainability · South Africa

This paper assessed the food security status of 208 households (109 urban and peri-urban agriculture (UPA) practicing, 99 non-UPA practicing) in Tongaat, eThekwini Municipality, South Africa. While a greater proportion (54%) of UPA practicing households consumed more than six food groups compared to non-UPA households (40%), a Mann-Whitney U test (U = 5292, p = 0.808) found no significant difference in dietary diversity between the two groups. Employment status, access to arable land, land tenure, and household monthly income were significantly associated with food security status.

Roberto Henke, Francesco Vanni · · Italy

This paper examines the multifunctional role of peri-urban agriculture in Italy through a comparative analysis of farms located within the main Italian urban poles. The analysis identifies both internal and external drivers influencing farmers' decisions to diversify income towards multifunctional activities. It shows that, within the post-productivist paradigm, peri-urban farms can play a pivotal role in sustainable land use and in enhancing entrepreneurs' provision of diverse social and economic services to the urban population.

Mariana Peixoto Espósito, Bruna Caroline Lima de Souza, Dirceu Pereira Siqueira · LA Referencia (Red Federada de Repositorios Institucionales de Publicaciones Científicas) · Brazil (Maringá)

This article analyzes the fundamental right to food within national and international legal frameworks, focusing on its implementation in Brazil through public policies. It specifically examines the Urban and Peri-urban Agriculture Program and the Community Gardens Program in Maringá/PR, concluding that the Community Gardens Program is an effective public policy for realizing the right to food. The methodology included a bibliographic review and field research based on interviews.

· Journal of Animal and Plant Sciences (J Anim Plant Sci ) ISSN 2071 – 7024 · Africa

A study in Port-Bouët, Abidjan, examined market gardeners' phytosanitary practices and pesticide residue incidence on lettuce. It found that 39.6% of pesticides used were not recommended for market gardening, 86.84% of gardeners did not protect themselves during application, and 80.26% did not observe pre-harvest intervals. Consequently, 93.33% of lettuce samples did not comply with Codex Alimentarius and EU standards due to high pesticide residue contamination.