Research & reports

Felipe Parada, Mireia Ercilla‐Montserrat, Verónica Arcas‐Pilz, Elisa López‐Capél, N. Carazo, J.I. Montero, Xavier Gabarrell, Gara Villalba, Joan Rieradevall, Pere Muñoz · Journal of the Science of Food and Agriculture · Spain (Barcelona)

In spring and summer 2018, in a rooftop greenhouse near Barcelona, coir, vegetable compost from urban organic waste, perlite, and a mixture of compost and perlite substrates were evaluated over three consecutive crop cycles of lettuce. This study aimed to assess the use of substrates made from local materials as an alternative for urban agriculture during periods of water supply cuts. Results showed that compost and the mixture yielded similarly to perlite, and organic substrates increased crop resilience to water restriction.

Perla Zambrano-Prado, Joan Muñoz‐Liesa, Alejandro Josa, Joan Rieradevall, Ramón Álamús, Santiago Gassó, Xavier Gabarrell · Sustainable Cities and Society · Spain (Barcelona)

This work established a remote sensing framework to identify and analyze the technical feasibility of roofs for integrating urban agriculture, rainwater harvesting, and photovoltaic systems. Applied to a region north of Barcelona, the study found that 8% of the roof area was feasible for tomato and lettuce production, potentially satisfying 210% of average tomato intake and 21% of average lettuce consumption. Rainwater harvesting systems could supply 94.26% of water for open-air lettuce and 53% for rooftop greenhouse tomatoes, while 50% of roofs were suitable for photovoltaic panels, representing 18% of citizens' average energy consumption.

Viktoria Shchurova · Current problems of architecture and urban planning · Ukraine (Kiev)

This article highlights the problems of the negative impact of the agricultural sector integrated into the central and middle zones of large cities. A critical view was formulated on the practical implementation of scientific and legislative documents, using the example of the city of Kiev, and strategies for reorganization, restrictions, or a complete ban on estate development in urban environments were analyzed. Specific plots of estate development in Kiev were identified as requiring reconstruction or complete renovation in accordance with the city's strategic development concept.

Bianca Cavicchi, Atle Wehn Hegnes · Frontiers in Sustainable Food Systems · Europe

This paper explored elements of sociocultural adaptation (SCA) to innovation and climate change in European urban agriculture through a scoping-exploratory review of existing literature. The elements were categorized into three main categories. Key results indicate that socio-technical and socio-ecological innovations are critical to SCA, and some identified SCA elements are more central to the adaptation process than others.

Susana Toboso‐Chavero, Cristina Madrid‐López, Xavier Gabarrell, Gara Villalba · Environmental Research Communications · Spain (Barcelona)

Implementation strategies for food-energy-water production systems on urban rooftops were evaluated in a typical housing estate in the Metropolitan Area of Barcelona, comprising 201 buildings and 13,466 inhabitants. Residents tended to choose strategies providing energy and water over the food production potential of rooftops. However, environmental assessment indicated that vegetable production alternatives were the least impactful, meeting 42-56% of residents' fresh produce demand and reducing environmental impacts by 24-37 kg CO2 eq m-2 per rooftop per year. This suggests residents were primarily concerned with energy expenses rather than food insecurity or social cohesion.

Paul D. Jensen, Caroline Orfila · Food Security · United Kingdom

This case study used publicly available data to spatially analyze the urban food system of Leeds, UK, assessing its food security and resilience. The study found that while Leeds has a significant food production and provision system, it is not food secure in terms of providing sufficient energy or macronutrients, nor does it function equitably for all residents. Improving the system, including through urban farming, would require high investment, multi-sector cooperation, and strong governance.

Melanie Jans-Singh, Rebecca Ward, Ruchi Choudhary · Journal of Building Performance Simulation · United Kingdom

A study addressing the lack of quantification of combined building-integrated greenhouse performance developed a building energy simulation (BES) of an archetype school building in EnergyPlus, co-simulated with a validated greenhouse energy simulator (GES), for school buildings in London, UK. Different greenhouse-building coupling configurations were evaluated via sensitivity analysis and a parametric study to estimate potential crop growth, heat recovery, and reduction in ventilation demand. A 250 m2 greenhouse on the top floor of the school could produce 6 t of lettuce with half the energy demand of an equivalent standalone greenhouse. Trade-offs among increased humidity, yields, and energy efficiency show that modeling is needed to ensure optimal designs.

Nora Gavare · Landscape architecture and art · Europe

In Sigulda, Latvia, the community garden "AUDZ," open to everyone, was created as a local, small-scale response to 21st-century problems including the depletion of natural resources, air pollution, rising industrial production, waste and an aging society. Designer Nora Gavare took part in an ERASMUS+ international training mobility visit on "Development of urban environment" in Hong Kong, where she gained insight into overpopulation, rapid urban growth at the expense of natural habitat, and rising food product demand. Photo mapping of Sigulda's public environment across different periods led to the conclusion that, given the town's rapidly growing population, fostering a sense of community and education processes is needed because opportunities for interaction among different social groups are lacking.

Alicja Kolasa-Więcek, Dariusz Suszanowicz · Environmental Science and Pollution Research · Europe

This study conducted field tests on model roofs and GIS-based building potential analysis in two districts of Opole, Poland, proposing a methodology to forecast reduction in rainwater drainage load from green roof deployment. Rainfall up to 5 mm/day is completely retained by both intensive and extensive roofs, and about 44% of torrential rainfall is retained. The runoff reduction coefficient is 0.63 for extensive roofs and 0.74 for intensive roofs; installing green roofs on 25% of suitable buildings is estimated to reduce drainage load enough to prevent localized flooding.

Annemarie Tabea Rost, Victoria Liste, Corinna Seidel, Lea Matscheroth, Marco Otto, Fred Meier, Daniel Fenner · Atmosphere · Germany (Berlin)

This study measured nocturnal air temperatures in 13 allotment garden complexes (AGCs) during the summer of 2018 in Berlin, Germany, comparing them to measurements in densely built-up urban areas, two large inner-city parks, and rural areas. On average, the assessed AGCs were 2.7 K cooler at night than urban areas, and most investigated AGCs (11/13) showed a larger mean nocturnal air temperature difference than urban parks. The nocturnal air temperature difference decreased significantly as the floor space index around AGCs increased, and shape complexity showed a significant positive correlation, while AGC size and distance to the city center significantly decreased with increasing nocturnal air temperature difference.

Andrea L’Erario · DOAJ (DOAJ: Directory of Open Access Journals) · Italy (Milan)

This paper describes the application of a multi-methodological decision-making support tool for concerted management policies (Public bodies/farmers) in peri-urban agricultural areas. The proposal is guided by three principles: conservation of the historical landscape as heritage, valorization of the social potentials of the landscape in the peri-urban context, and sustainable management with a public-private partnership perspective. Peri-urban agricultural landscapes possess potential social value linked to agricultural area use, in addition to their agricultural-productive value.

Elizabeth Nicholls, Adrian Ely, Linda Birkin, Parthiba Basu, Dave Goulson · Sustainability Science · United Kingdom (Brighton and Hove)

A review and case study in Brighton and Hove, UK, examined the contribution of small-scale urban and peri-urban agriculture to sustainable food production. Findings showed these small, labor-intensive systems with high crop diversity can be highly productive, offering environmental and social advantages over industrial agriculture through minimal synthetic inputs and local consumption. However, significant knowledge gaps persist regarding productivity, economic impacts, pesticide use, and biodiversity implications.

Paola Clerino, Agnès Fargue‐Lelièvre · Sustainability · France

This study used a participatory approach with French urban agriculture stakeholders to identify sustainability objectives and 21 criteria for professional intra-urban farms. Six objectives were established, and agro-environmental and socio-territorial criteria were deemed more important than economic ones, with food production not being mentioned. A critical finding was that decision-makers focused more on projects' external sustainability and urban farmers' agricultural background, suggesting a reliance on farmers for internal sustainability rather than direct assessment.

Pierre Donadieu · Territoire en mouvement · France

This paper presents an opinion from the French Economic, Social and Environmental Council (CESE), positioning urban agriculture as a decisive tool for sustainable cities. During the 2010s, six major publications on urban agriculture sought to identify this economic and social phenomenon, which has been emerging or returning in France and globally for at least 20 years. There is abundant literature in this field, with three collective works in French initiating these publications.

Vincenzo Rusciano, Gennaro Civero, Debora Scarpato · Sustainability · Italy (Naples)

An empirical analysis based on structured interviews was conducted in the Naples area of Italy with a sample of 150 gardeners to investigate the link between community gardens and social ecological innovation. Variance and correlation analysis explored the extent to which social and environmental dimensions are linked to community gardens. Two attributes of community gardens, namely urbanization effects mitigation and wellness and community, were identified as having the ability to influence other community garden attributes.

Martí Rufí-Salís, Felipe Parada, Verónica Arcas‐Pilz, Anna Petit‐Boix, Gara Villalba, Xavier Gabarrell · Frontiers in Plant Science · Spain (Barcelona)

This study investigated a closed-loop crop cascade system in a Barcelona rooftop greenhouse, using tomato leachates to irrigate five successive lettuce cycles. The results showed that low yields (below 130 g per lettuce plant) were obtained when the cascade system was used during the early stage of the donor crop, as the nutrient amount, especially nitrogen, was insufficient for the receiving lettuce crop. Additionally, electrical conductivity values became too high (near 3 dS/m) at the end of the donor crop cycle, indicating limitations in maintaining optimal conditions throughout.

Ornela María Muñoz Millet, Antonio Yepes Jiménez · · Spain

A school in Spain implemented composting of organic waste from its canteen for use in an ecological school garden, with support from the AGROA school composting program and the Aguilas City Council. The entire educational community participates, from canteen staff separating waste, to the janitor transporting it, and teachers and students organizing it for compost and using it as fertilizer. This practice serves as a didactic resource for developing environmental attitudes and sustainable habits.

Elisa Peñalvo López, Francisco Javier Cárcel Carrasco, David Alfonso-Solar, Iván Valencia-Salazar, Elías Hurtado-Pérez · Energies · Spain

This paper investigated the effect of a green roof on a public building's energy consumption in a Mediterranean location in Spain through experimental campaigns. Results showed a substantial 30% improvement in cooling energy demand for a standard summer day and a 15% reduction in heating energy demand for a winter day. Annual simulation analysis, calibrated with experimental data, indicated an overall 19% improvement in energy efficiency but also a 6% increase in peak power during winter.

Cordula Kropp, Clara Da Ros · · Europe

Ethnographic case studies examined urban farming movements in Leipzig, Germany and Nantes, France. The Leipzig movement is strongly oriented toward building an environmentally friendly, sustainable post-growth economy, while the Nantes movement is aimed above all at overcoming social inequality and exclusion; in both cities, participants respond to forces in urban development they perceive as opposed to their own needs and interests, encouraging fellow citizens to reclaim local spaces and cultivate them for community subsistence.

Pierre Donadieu · Territoire en mouvement · France

This is a review-style article introducing a June 2019 opinion document from France's Conseil economique, social et environnemental (CESE), L'agriculture urbaine: un outil determinant pour les villes durables (98 pages). It notes that during the 2010s, six major publications sought to characterize urban agriculture as an economic and social phenomenon that has been emerging or resurging in France and worldwide for at least 20 years, and traces this literature back to three earlier French-language collective works, including one titled Agriculture urbaine: amenager.

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 Burchard‐Dziubińska · Economics and Environment · Europe

An analysis of urban gardening's role in building city resilience to economic and social change and global warming examines whether Polish cities use it to strengthen resilience to climate change. It finds that using urban gardening for climate resilience is becoming more common worldwide, but that Polish cities have not yet joined this trend.

Johannes Langemeyer, Diego Wedgwood, Timon McPhearson, Francesc Baró, Anders L. Madsen, David N. Barton · The Science of The Total Environment · Spain (Barcelona)

This study developed a spatial multi-criteria screening tool in Barcelona, Spain, to prioritize green roof locations and designs for optimal ecosystem service provision. Fifteen spatial indicators and five green roof designs were analyzed and weighted by local experts. The assessment found high demand for green roof ecosystem services across Barcelona, especially in dense residential and industrial areas, with habitat, pollination, and thermal regulation being most needed, while runoff control and food production were least demanded. Naturalized roofs offered the highest potential for 87.5% of rooftop area.

Barbara Maćkiewicz, Raúl Puente Asuero, Antonio Garrido Almonacid · Quaestiones Geographicae · Spain

This study investigated how urban allotment gardens in Baeza, Andalusia, Spain, affect the city’s sustainable development. The research showed that allotment gardens in Baeza endorsed all three pillars of sustainable city development: ecological, economic, and social. However, it was found that developing broader community relations on the city scale, reviving the declining local grocery market, and disseminating environmental initiatives that allotment gardens could promote and facilitate were missing.

Christine Aubry, Nastaran Manouchehri · OpenEdition (OpenEdition) · France (Paris)

Urban and peri-urban agriculture is exposed to various forms of pollution related to cultivation methods and urban air and soil quality, with different crop types exhibiting varied reactions to pollutants. The T4P and REFUGE programs on urban farms in the Paris region, and the ADURAA and QUALISANN programs studying vegetable-growing in Antananarivo, Madagascar, aim to assess health risks and oversee practices using methodological frameworks.