Research & reports

FAO, Rikolto, RUAF · Food and Agriculture Organization of the United Nations (FAO), Rikolto & RUAF · Global

A comprehensive guide co-published by FAO, Rikolto and RUAF for local decision-makers, urban planners and practitioners. It frames urban and peri-urban agriculture from production through to urban food systems and policy, promoting reduced food loss via short supply chains, biodiversity protection, social inclusion, and urban-rural linkages.

Shimpo N. · 学芸出版社 (Gakugei Shuppan), ISBN 978-4-7615-2821-8, 208pp · Global

Shimpo's single-authored book on 'urban-type gardens' that activate underused spaces scattered through cities—suburban abandoned farmland, corners of urban parks, commercial-building rooftops, housing-estate grounds. Drawing on advanced cases and practitioner interviews from Germany, Austria, New Zealand, Canada, Australia and Japan, it shows how such gardens address vacant-land use, community revitalisation, greening and food/environmental education.

Tripodi P., D'Alessandro A., Francese G. · Frontiers in Plant Science 13:1031776 · Italy

Integrated genomic and biochemical analysis of heirloom tomatoes linking fruit shape and size to sugars, organic acids, and aroma compounds. Demonstrates heirlooms as germplasm resources for high food quality and sustainable agriculture.

Jing R., Liu J., Zhang H., Zhong F., Liu Y., Lin J. · Energy (Elsevier), 256:124626 · China (Shenzhen)

Integrating GIS, biogeochemical and solar simulation to quantify how much food and energy urban rooftop agrivoltaics (lettuce grown under PV panels) can produce. For Shenzhen's 854,000 rooftops (~105 km²) it estimates ~0.98 Mt/year of lettuce (meeting the whole city's demand) and ~2,106 MW of PV generating ~1,899 GWh/year, while flagging ~4.11 Mt/year of extra irrigation water as a key water trade-off.

Vega Castro D.A., Vega Clavijo L.T. · Revista Luna Azul · Colombia (Bogotá)

This study sampled soil, irrigation water, and lettuce from 49 urban gardens across 13 Bogotá localities to quantify heavy metals (Pb, Cd, Cr, Ni, As, Hg), finding that all detected concentrations remained below national and international health-based guidance values.

Asian research network · ResearchGate · Asia

Research on organic waste composting and its application in urban agriculture across emerging Asian cities, integrating circular agriculture with waste reduction.

Hussein L., Uren C., Rekik F., Hammami Z. · Waste Management & Research · Middle East, North Africa

Comprehensive review of waste management and composting strategies in MENA region, with implications for circular urban agriculture in water-scarce contexts.

Ashley Conway, Christine Nieman · Urban Agriculture & Regional Food Systems · United States

This literature review identifies three key barriers to keeping livestock in US urban and peri-urban agriculture—animal feed resources, water quality and nutrient cycling, and use of heavy-metal-contaminated sites—and argues that agroforestry (silvopasture) practices can help address them. The authors propose two theoretical silvopasture systems, one for urban and one for peri-urban settings, and call for future whole-system research.

Mykl Nelson, Gwynne Mhuireach, Gail A. Langellotto · Urban Agriculture & Regional Food Systems · United States (Oregon)

To characterize residential-scale urban agriculture soils, the authors sampled 27 residential vegetable gardens in two western Oregon cities, distinguishing in-ground beds from raised beds. They found these soils frequently exceeded recommended ranges for many fertility parameters—likely due to routine overapplication of compost, amendments, and fertilizers—with raised beds significantly higher than in-ground beds in carbon/nitrogen ratio, active carbon, and sulfur.

María Teresa Gómez-Villarino, Teresa Briz · California Agriculture · United States (Berkeley)

This study examined urban gardens in Berkeley, California, and Madrid, Spain, to observe how agroecological principles—efficient, sustainable use of local resources and inputs—are practiced. It reports that gardens using good ecological practices provide a wide range of ecosystem services, including cultural services such as places to socialize, and can serve as model urban agricultural centers contributing to the UN Sustainable Development Goals.

· Frontiers in Microbiology · Germany (Berlin)

Investigated how soil microbial communities shift along an urban gradient in Berlin, highlighting that microbial communities inhabiting urban soils govern nutrient cycling and support of plant communities.

Schittko C. · Journal of Ecology · Germany (Berlin)

Shows that biodiversity maintains soil multifunctionality and soil organic carbon in novel urban ecosystems studied in Berlin.

Rüschhoff J., Hubatsch C., Priess J., Scholten T., Egli L. · Renewable Agriculture and Food Systems · Germany (Leipzig)

A Leipzig case study assessing food self-sufficiency potential, finding that combining organic agriculture, reduced food loss, and a more plant-based diet could reach a mean self-sufficiency level of about 95%.

Ejigu N., Sitotaw B., Girmay S., Assaye H. · International Journal of Food Science · Ethiopia

Evaluates water hyacinth biomass, alone or mixed with wheat/teff straw, as a low-cost substrate for oyster mushroom cultivation. The authors conclude water hyacinth is a promising cheap substrate owing to its ideal C/N ratio and low lignin, while also helping control the invasive weed.

· Environment, Development and Sustainability · Sri Lanka

Explores composing a low-cost green roof substrate from locally available organic wastes, arguing that organic wastes offer higher plant-nutrient content, water retention and suitable pH compared with recycled aggregates.

Ducasse V., Capowiez Y., Peigne J. · Agronomy for Sustainable Development · France (review)

Reviews the suitability of vermicomposting the organic fraction of municipal solid waste, the quality of the resulting vermicompost, and its impact on crops and soil.

Angelica Mendoza Beltrán, Kelzy Jepsen, Martí Rufí-Salís, Sergi Ventura, Cristina Madrid‐López, Gara Villalba · The Science of The Total Environment · Spain (Barcelona)

This study mapped N2O emissions from peri-urban agriculture in the Metropolitan Area of Barcelona (AMB), Spain. Researchers spatially distributed factors like crop type, fertilizer use, and irrigation, creating N2O emission maps using crop-specific and Tier 1 IPCC emission factors (EFs). The study found that Tier 1 IPCC EFs estimated 15% more emissions (7718 kg N2O-N year−1) than crop-specific EFs (6533 kg N2O-N year−1) for the entire AMB, indicating higher emissions for rainfed crops with Tier 1 EFs and for irrigated horticultural crops with crop-specific EFs. The mapping helps evaluate spatial variability of key factors but carries uncertainties due to downscaling regional data.

Sani Abubakar Mashi, Samuel Yakubu, Sofia Yuniar Sani · Asian Research Journal of Agriculture · Africa

A study in the Kubanni basin of Zaria, Africa, evaluated the quality of wastewater used for irrigating urban agriculture soils. The wastewater contained arsenic, iron, chromium, copper, zinc, manganese, and lead. Although concentrations were generally below Nigeria's permissible limits for irrigation, the study noted the metals' tendency to accumulate in soils, raising concerns about potential heavy metal buildup in irrigated soils and crops.

Myeong Suck Jeong, Mina Lee, Chaw Su Lwin, Kwon-Rae Kim · 한국토양비료학회지 · South Korea

This study investigated heavy metal contamination in urban agricultural soils near railway tracks and an industrial complex in Jinju, South Korea, to ensure food safety. While the average heavy metal values did not exceed soil contamination guidelines, some individual soil samples showed concentrations higher than the guidelines. Furthermore, the geoaccumulation index (Igeo) indicated that several soils were contaminated compared to background levels, with Cu, Pb, Zn, and Sb showing the highest contamination. Long-term monitoring of urban vegetable garden soils is recommended.

Wim van Dijk, J.E. Jansma, J. Broeze, J.J.R. Groot · · Netherlands (Amsterdam)

This chapter focuses on regional resourcefulness for food systems, arguing that urban areas are vital for closing nutrient loops to prevent resource depletion. Two case studies in the Metropolitan Region of Amsterdam (MRA) discuss phosphorus (P) flows, exploring the potential of a circular food system in Almere and quantifying actual P-flows across the MRA. The chapter concludes that a circular City Region Food System is technically feasible but requires a fundamental shift in the organization of food and waste systems.

Ionat; id_orcid 0000-0001-9080-2282 Zurr, Oron; id_orcid 0000-0002-2893-5364 Catts · UWA Profiles and Research Repository (University of Western Australia) · Australia

The "Sunlight, Soil & Shit (De)Cycle" project, presented by SymbioticA in February 2022, is a performative experiment exploring agricultural technology (AgTech) and its aim to remove natural elements like sunlight, soil, and organic waste from food production. This project considers whether the precursor to sustainable food systems will be the creation of a metabolic rift, where the means of production grow ever distant from nature. It highlights a critical environmental tradeoff by questioning the separation of humans from nature in technological farming.

Elizabeth Regier, Walter McDonald · Journal of Sustainable Water in the Built Environment · United States (Milwaukee)

This study monitored two bioswales treating runoff from an urban farm in Milwaukee, WI, United States, to assess their hydrologic and water quality performance. The bioswales effectively reduced runoff volume, peak flows, total phosphorus, and high concentrations of total suspended solids (TSS >25 mg/L), achieving a median 98% load reduction across all pollutants. However, they showed mixed results in reducing total nitrogen concentrations and TSS at low influent concentrations (≤25 mg/L).

Jianyun Nie, Akira Kiminami, Hironori Yagi · Sustainability · China (Shanghai)

This study analyzed the sustainability status of 22 urban leisure farms in Shanghai using the IDEA method. Farms' average sustainability scores were 25.72 on the agroecological scale, 32.5 on the socioterritorial scale, and 46.5 on the economic scale. This analysis revealed that while urban leisure agriculture in Shanghai has high sustainability at the economic scale, its overall sustainability was low, indicating a need for further strengthening.

Yurisandra Sierra Reyes, Ernesto Juniors Pérez Torres, Ana de Dios Martínez, Manuel Francisco Rodríguez Saldaña, Arialsis Adán Verdugo · Zenodo (CERN European Organization for Nuclear Research) · Cuba (Camagüey)

To evaluate the use of agroecological technologies in the Urban Farm of Camagüey municipality, semi-structured anonymous surveys were applied to 77 managers and producers (43 producers, 34 managers) working in the Urban, Suburban, and Family Agriculture Program. The surveys identified agroecological technologies such as crop rotation and intercropping, biofertilizers, insect traps, and biological products. Organopónicos, semi-protected, and intensive gardens were identified as the units systematically applying these technologies, with farms and plots doing so to a lesser extent.

Dwi Haryanta, Tatuk Tojibatus Sa’adah, Mochamad Thohiron · Indonesian Journal of Engagement Community Services Empowerment and Development · Indonesia (Surabaya)

Community empowerment activities at the "Satu Padu" farmer group in Jambangan Village, Surabaya, Indonesia, aimed to disseminate knowledge on processing urban organic waste into compost and liquid organic fertilizer for urban farming. Using Participatory Rapid Rural Appraisal methods, the program involved residents and the farmer group in directly practicing the technology. Participants learned to make compost from tree stumps and liquid organic fertilizer from fruit and vegetable waste, and to use these in planting.