Research & reports

Mohd. Ramzi Mohd. Hussain, Norul Hafizah Yusoff, Izawati Tukiman · · Global

This paper aims to discuss the literature framework of the growing demand for urban farming activities within the city environment and how they benefit the concept of environmental sustainability. It describes the advantages of urban farming activities from environmental, economic, and social perspectives that contribute to urban sustainability, evaluating the benefits and potential of implementing urban farming within limited urban spaces.

Eileen Bogweh Nchanji, Imogen Bellwood‐Howard, Nikolaus Schareika, Takemore Chagomoka, Johannes Schlesinger, D. Rodríguez Torres Axel, Glaser Rüdiger · International Journal of Agricultural Sustainability · Ghana (Tamale)

An ethnographic study in Tamale, Northern Ghana, assessed the sustainability of urban vegetable production between 2008 and 2014. While urbanization increased cultivation of profitable vegetables like cabbage, the practice involved irrigation with grey and wastewater and high pesticide use, posing health and environmental hazards. Industrial growth reduced open space urban agriculture by 8.7%, leading farmers to use interstitial spaces and peri-urban fringes, indicating a dynamic but not yet sustainable production system.

Rosa Jacob Chilundo, Paulo César Marques de Carvalho, Mário Diniz, Adriano Bezerra · Renewable Energy and Power Quality Journal · Brazil

This paper analyzed the technical and financial feasibility of a stand-alone photovoltaic powered irrigation system applied to a familiar production unit in Brazil. The system was installed at the Center for Teaching and Research in Urban Agriculture (NEPAU) on the PICI campus of the Federal University of Ceará, occupying 134 m² with a 3534-liter water reservoir, a 12 VDC pump motor, and a 135 Wp photovoltaic module. Efficiencies for the photovoltaic module, pump, and global set were 8.4%, 42%, and 3.5% respectively, with an assumed service life of 25 years and capital return after 9.3 years.

Lucy Diekmann, Leslie Gray, Gregory A. Baker · Local Environment · United States (California)

This case study in Santa Clara County, California, used interviews and surveys to explore the implications of historic drought for urban agriculture (UA). It found that metropolitan California's decentralized water supply and diverse institutional arrangements create an uneven landscape of water access for UA. This results in geographically and socially differentiated pressures on UA water users to change water-consuming practices, with responses varying due to site-specific sociotechnical arrangements and UA purposes.

Okoro Enyinnaya Okoro, Iwueke Nyainbau Tarinabo, Agunanna Henry Ibe, Ndulaka Chigozie Martin · International Journal of Environmental Chemistry · Nigeria (Aba)

This study investigated the economic and environmental contributions of urban farming in Aba, Abia State, Nigeria, using Landsat 8 satellite imagery and data from 100 urban farmers. Most respondents were self-employed females aged 41-50, primarily engaged in cassava and maize farming to supplement income. The findings indicate a significant environmental contribution of urban farming in Aba.

Norul Hafizah Yusoff, Mohd. Ramzi Mohd. Hussain, Izawati Tukiman · PLANNING MALAYSIA · Malaysia

This paper reviews and analyzes the importance of a framework for urban farming activities within cities, describing the community's role in achieving environmental, economic, and social sustainability. It evaluates the benefits and potential of urban farming in limited urban spaces, noting its contribution to improving quality of life and addressing food shortage crises. The paper concludes that the community's role is crucial for implementing urban farming activities in urbanized areas.

Antoinette WinklerPrins · CABI eBooks · Global

This chapter provides definitions and theoretical framing for urban agriculture (UA). Research on UA has evolved beyond describing food production systems to its role in creating spaces of community, resistance, and empowerment. UA serves as a means for those not central to the city's function to claim a right to the city, and it is a rich field for interdisciplinary inquiry into urban sustainability.

James Ward, John Symons · Horticulturae · Global

A two-stage linear programming model examined the net value of urban agriculture across different climates and water prices, treating crop type and yield as decision variables constrained by dietary food-group bounds, protein and energy requirements, and area per person. The model found optimal crop regimes to be similar across climates and water prices because high-profit-margin crops were consistently selected, and that smaller per-capita garden size was optimal for water-use efficiency and net value, with a modest, well-chosen food garden shown to be cost-effective even under conservative yield and water-use assumptions.

Selena Ahmed, Sarabeth Buckley, Anne Elise Stratton, Feven Asefaha, C. Butler, Matthew J. Reynolds, Colin M. Orians · Agroecology and Sustainable Food Systems · Global

A study on green-roof urban agriculture, which faces the ecological challenge of limited soil moisture, compared two soil moisture management practices — sedum (Sedum album) groundcover versus watering — for their effects on the performance and quality of three perennial culinary herbs: thyme, mint and oregano. Individually and interactively, sedum groundcover and watering significantly affected performance measures (biomass, vitality, module coverage) and quality (total phenolic concentration) during early establishment, but had variable effects at later developmental stages. The results suggest sedum groundcover can substitute for watering of hardy culinary herbs on green roofs in terms of plant performance and quality.

Libby Christensen, Ryan E. Galt, Alissa Kendall · Renewable Agriculture and Food Systems · United States (California)

This case study assessed greenhouse gas (GHG) emissions from five Community Supported Agriculture (CSA) operations in the Sacramento Valley, California, collecting input, production and distribution data from each farm and reporting emissions in CO2e per 1 kg of CSA produce at the pickup location. Total emissions varied widely, ranging from 1.72 to 6.69 kg CO2e per kg of produce with an average of 3.94 kg CO2e, and electricity was the largest emissions source, contributing over 70% of total CO2e on average. Despite apparent similarities among the operations in production site, acreage, customer base and practices, there was still substantial variability in total GHG emissions. The study argues that the complexity of production and distribution systems means food systems cannot be reduced to a simple binary of local being better than conventional, or vice versa, though localized production systems that use less electricity (or renewable energy) and efficiently produced compost had lower GHG emissions than those that did not.

Fatemeh Kalantari, Osman Mohd Tahir, Raheleh Akbari Joni, Ezaz Fatemi · Journal of Landscape Ecology · Global

This paper critically reviews 60 published documents on vertical farming — cultivating plants and livestock on vertically inclined surfaces such as skyscrapers in land-scarce urban areas — assessing it against environmental, social, and economic dimensions of sustainability, and notes that published critical reviews on the topic remain scarce. Economic viability is named as one of the challenges considered alongside environmental and social factors, but the abstract does not present specific cost, revenue, or failure data to support this; it concludes, without citing supporting figures, that vertical farming can be "potentially beneficial" for food production, quality, safety, and food security.

Mariana Cardoso Chrispim, William A. Tarpeh, Delhi Teresa Paiva Salinas, Marcelo Antunes Nolasco · Journal of Water Sanitation and Hygiene for Development · Brazil

Separately collected urine is presented as an attractive potential fertilizer because of its high nutrient content, low cost, and inherent link between urban wastewater management and peri-urban agriculture. Urine from waterless urinals was applied to corn and lettuce to examine the impact of application rate and frequency on plant growth and soil parameters; in both crops, urine application significantly (p < 0.05) increased growth and leaf production relative to control plants. More frequent applications led to lower soil cation exchange capacity for corn and higher soil nitrogen content for both crops. Preliminary implementation calculations suggest that installing waterless urinals at the University of São Paulo's School of Arts, Sciences, and Humanities campus could save over 1,500 m³ of water and produce 360 m³ of urine annually; these experimental and modeling results are discussed in the context of scaling up urban urine collection, transport, and fertilization in São Paulo, Brazil.

Yann Dusza, Sébastien Barot, Yvan Kraepiel, Jean-Christophe Lata, Luc Abbadie, Xavier Raynaud · Ecology and Evolution · Global

This study examined how combinations of 20 plant species from 5 families, two substrate types (natural soil vs. artificial), and two depths (10 cm vs. 30 cm) affect green roof ecosystem functions including water retention, biomass production, nutrient cycling, and transpiration. Artificial substrates increased aboveground biomass 1.4-3.5 times relative to natural soil, and deep substrates produced 2-3 times more biomass than shallow ones on natural soil (1.4-1.9 times on artificial substrate), but no single combination of factors enhanced all studied ecosystem functions simultaneously.

Steve G. Hallett, Lori Hoagland, Emily Toner · Horticultural reviews · Global

This chapter discusses urban agriculture from economic, environmental, and social perspectives, acknowledging differences between urban agriculture in small and large cities, as well as the Global North and South. Urban farms and community gardens can have both positive and negative environmental impacts, such as reducing or increasing energy consumption, improving water infiltration, and beautifying neighborhoods, or producing odors and contaminating water. The chapter also attempts to frame policy recommendations that might help guide urban agriculture's development.

Christine Hvitsand · Agroecology and Sustainable Food Systems · Norway

This article explores why Norwegian producers and consumers engage in Community Supported Agriculture (CSA), identifying distinct values and motivations related to environmental protection, justice, health, participation, and communication. While CSA demonstrates transformational power in the agri-food system through sustainable practices and power reallocation, the challenge remains to upscale these actions and prevent the dilution of core values and agroecological practices.

William Kort · UWM Digital Commons (University of Wisconsin–Milwaukee) · United States

This study developed a framework for life cycle environmental assessment of urban organic waste utilization in urban agriculture, specifically fruit and vegetable production. Results suggest that a full "urban nutrient cycle" offers significant environmental benefits, including meeting up to 70% of vegetable and 17% of fruit consumption needs in Northern and Eastern U.S. cities, with potential water savings of 10-17% of annual domestic use. Optimizing resource recovery through source separation leads to 1-2% lower wastewater generation and up to 44% greater phosphorus recovery, while overall energy and emissions benefits are 1-2% of a city's annual totals.

Sostenis Sampeliling, Santun R.P. Sitorus, Siti Nurisyah, Bambang Pramudya · Analisis Kebijakan Pertanian · Indonesia (DKI Jakarta)

This study analyzed key factors influencing the sustainability and policy development of urban agriculture in DKI Jakarta, Indonesia, using MDS and Rap-Ur-Agri methods. The analysis found that the existing sustainability status of urban agriculture development had an index value of 48.70%, indicating it was less than sustainable. Key factors for sustainable urban agriculture include yard area, eco-friendly commodity and technology development, agricultural extension and institutions, expansion of farming land/space, stakeholder cooperation, and agricultural incentives.

Sophie Lufkin, Emmanuel Rey, Suren Erkman · Infoscience (Ecole Polytechnique Fédérale de Lausanne) · Switzerland

A case study in Yverdon-les-Bains, Switzerland, explored three scenarios (technological, behavioral, and symbiotic) for the future development of an urban sector by 2035. These scenarios tested design strategies related to industrial symbioses, production, storage, transportation, and urban agriculture, with energy flow analysis assessing each scenario's energy performance. The research highlights the necessity of complementary approaches that simultaneously combine technology, user behavior, and urban symbiosis to achieve high-energy performance at the neighborhood scale.

Caio Vieira Vasconcelos · · Brazil (Belo Horizonte)

This study presents a case study on water use in urban agriculture in Belo Horizonte, Brazil, focusing on community gardens in the Barreiro region (Vila Pinho and Jardim Produtivo gardens). It describes the physical structure and irrigation operations, and analyzes 2015 water consumption data in comparison with climatic variables. The research identified limitations, threats, positive aspects, opportunities, and potential solutions related to water use in these community gardens.

Rosanne Wielemaker, Jan Weijma, G. Zeeman · Resources Conservation and Recycling · Netherlands (Rotterdam)

This paper assesses the match between supply from New Sanitation (NS) systems and demand from Urban Agriculture (UA) for nitrogen, phosphorus, and organic matter in Rotterdam. Using the Urban Harvest Approach, the research found that UA's demand for nutrients and organic matter can be minimized by 65–85%, achieving 100% self-sufficiency for phosphorus and partial self-sufficiency for nitrogen and organic matter. The integration of NS and UA maximizes urban self-sufficiency.

Ellen Kohl, John A. Knox · Weather Climate and Society · United States (Georgia)

This paper examines the relationship between scientific definitions of drought and water management politics, using a case study of the 2007–09 drought in Georgia, USA. Data from archival research, direct observation, and interviews with urban agricultural sector members, environmental regulators, and government officials revealed how stakeholders produced and utilized multiple understandings of drought. The study found that stakeholders can leverage drought complexity to achieve political goals and alter water management, as demonstrated by the green industry in Georgia in 2009.

Andrew Syah Wicaksana · Jurnal Sains dan Seni ITS · Global

This study proposes apartment designs using an edible landscape approach to address continuous population growth, urbanization, climate change, and pressure on natural resources. This design aims to bring positive psychological and practical influences towards a productive and conducive lifestyle in urban environments. The design approach is extrinsic (nature) and environmentally-oriented (ecological design), utilizing Donna P. Duerck's "Architecture Programming" method and Rob Krier's theory of architectural composition.

肇 石原, Hajime Ishihara · Institutional Repositories DataBase (IRDB) · Japan (Osaka)

This study analyzed changes in green space components (parks, agricultural land, forests) across Osaka Prefecture, Japan, from 1970 to 2010. While forest area decreased slightly and park area increased, the increase in park area was insufficient to offset the significant reduction in agricultural land. Consequently, the overall green space ratio in Osaka Prefecture showed a declining trend, particularly noticeable in Osaka City and its surrounding areas.

Anbuchchelvi Kalaiarasan · Indian Journal of Science and Technology · Global

This study aimed to strengthen urban landscapes with green infrastructure using passive sustainable practices to improve urban health and safety. It identified 30 micro-level passive techniques, such as xeriscaping and green roofs, which utilize natural processes and limit active energy use. The research compared the environmental effects of these techniques for existing and proposed urban landscapes, concluding that conserving soil, water, air, energy, and species is key to connecting fragmented landscapes into a unified urban green mass.

Monika Larasati P E, M.Eng. Ir. Sudaryono · · Spain (Madrid)

This study describes the planning of the Manzanares River area in Madrid, Spain, focusing on its philosophy, concepts, and principles. It notes that the river, once overlooked due to the M-30 highway, is now part of efforts to restore urban ecological elements. The research used a deductive qualitative method with content analysis of relevant literature and texts.