Research & reports

Lukas Egli, Jana V. Schmidt, Hanna‐Sofie Haf, Mirco Zech · Urban Agriculture & Regional Food Systems · Global

This exploratory quantitative survey assessed farmers' perceived sustainability impacts of converting to Community-Supported Agriculture (CSA). While most perceived impacts were positive, adverse impacts were anticipated regarding climate and water, such as increased water usage from vegetable production. Farmers in CSAs with medium to high member participation perceived significantly higher biodiversity impacts and more positive sustainability impacts for members.

Ceccanti F., Bischi A., Desideri U., Baccioli A. · Energy Conversion and Management · 国際比較（トロンハイム・上海・ドバイを想定したモデル計算）

Filling a gap left by studies that assessed vertical-farming energy use and cost-effectiveness with simplified models, this paper isolates how individual input parameters drive efficiency, sustainability and economic viability using a detailed modelling framework with sensitivity and correlation analyses. It evaluates 162 scenarios combining three levels of temperature, photosynthetic photon flux density (PPFD) and CO2 concentration across the socio-environmentally distinct Trondheim, Shanghai and Dubai regions, at two insulation thicknesses. Because of HVAC and dehumidification, crop productivity stays optimal regardless of insulation or external climate. PPFD dominates growth (correlation 0.85), ahead of CO2 (0.36) and temperature (0.22), and also drives energy consumption (0.73). Lowest specific energy consumption coincides with lowest productivity (55 kg/m2), and the cheapest levelized cost of lettuce came at 24 degC, 250 umol/m2s PPFD, 1400 ppm CO2 with insulation (102 kg/m2). Only decarbonised energy systems can support vertical farming without raising CO2 emissions relative to imported lettuce.

Margarethe Karpe, Jeremías Lachman, Lili Wang, L.F.M. Marcelis, E. Heuvelink · Sustainable Production and Consumption · Global

A Delphi survey with 108 experts explored urban agriculture's potential contributions to Sustainable Development Goals (SDGs) under a scenario of 30% urban food self-sufficiency. Experts identified SDG 7.2 (renewable energies) as a key challenge due to high energy use, and agreed that none of the evaluated SDG targets for urban agriculture will be met by 2030. They also noted a lack of regulations and public policies for innovative agricultural systems.

Aashna Sinha, Kailash Bisht, Digvijay Singh · · Global

This article explores vertical hydroponic farming, noting its benefits like reduced space and water use, and enhanced robustness with Plant Growth-Promoting Microorganisms (PGPMs). However, it also demonstrated that the system's ecological impact is significantly affected by growing media, pots, electricity use, and transportation. The study suggests potential for reducing greenhouse gas emissions and abiotic resource decline by using fiber as growing medium and paper containers.

Dongxiang Chen, Yuanming Wang, Haijun Bao · Habitat International · Global

This research extended the land sharing and sparing framework to urban land use, quantifying the impact of urban services, food production, and ecosystem services. The results showed that land-sparing scenarios had a 23.6% lower overall value loss than sharing scenarios on average. However, while land-sparing mitigates losses in food production and ecosystem services, it increases the cost of urban services, creating a trade-off that challenges achieving an optimal win-win situation.

Institut de Gestion des Techniques Urbaines, Université Larbi Ben M’hidi, MERIEM BENLAHRECHE, Saïd Mazouz, Département d’architecture, Université Larbi Ben M’hidi · Revue Roumaine de Géographie / Romanian Journal of Geography · Algeria

This article aims to explain urban phenomena in Hamma Bouziane, Algeria, a city known for its fertile land. The study indicates that the peri-urban agriculture of Hamma Bouziane is suffering negative repercussions due to unbridled urban expansion and socio-economic changes.

CHRISTINA FELIX KIFUNDA · Asian Journal of Agriculture · Tanzania

Combining 30 years of temperature and rainfall data from the Tanzania Meteorological Agency with a questionnaire survey of 386 urban-agriculture households across five wards of Kinondoni City (Bunju 118, Kunduchi 42, Mabwepande 102, Mzimuni 28, Wazo 96), plus focus group discussions, key informant interviews and direct observation, this study examined climate change's effects on urban crop production and farmers' adaptation strategies. More than 70% of surveyed smallholder farmers were aware of climate change indicators, consistent with the meteorological data, citing rising temperature (76%) and declining rainfall (73%); pests and diseases were ranked highest (88%) among significant climate-change effects. Land scarcity was also identified as a significant challenge for urban agriculture, and pesticide and fertilizer use was the most commonly cited adaptation strategy (65%).

Arun Kafle, James Hopeward, Baden Myers · Sustainability · Global

An integrated modelling framework using proxy measures for economic benefit (net margin), social benefit (full-time farmer employment equivalent per consumer) and environmental benefit (CO2 emission reduction) was applied to two contrasting development settings, Adelaide, Australia, and the Kathmandu Valley, Nepal, to examine the characteristics of urban agriculture (UA). Using two-stage optimisation across three mechanisation levels (non-mechanised, garden tiller, garden cultivator), two purposes (gardening or commercial), two crop-value categories and two market mechanisms, the model found that no single UA form maximises economic, environmental and social (employment) objectives simultaneously: commercial UA, in which both land and labour are costed, was favoured for maximising profit or reducing CO2 emissions, while gardening-form UA was favoured for maximising employment participation. In Adelaide the model favoured commercial UA for best-case profit and carbon emissions but gardening UA for employment maximisation, while in the Kathmandu Valley the model selected gardening UA under the given assumptions.

Imen Bendjemila, Salah Chaouche · DOAJ (DOAJ: Directory of Open Access Journals) · Algeria

Urban sprawl in N'Gaous, Algeria, expanded its land area by over ten times (from 33.7 to 379.7 hectares) and its population by over six times (from 4,887 to 33,515 persons) over 60 years. This rapid growth creates significant issues, particularly for peri-urban orchards, which are the primary economic activity. The study used an analytical approach with Geographic Information Systems to assess the agronomic potential of soils and quantify agricultural land consumed by construction, aiming to achieve an optimal agri-urban balance rather than merely avoiding urban expansion.

Imen Bendjemila, Salah Chaouche · Prostor : znanstveni časopis za arhitekturu i urbanizam · Algeria

This study investigated urban growth and urbanization in N'Gaous, Algeria, over the last 60 years, using an analytical approach and Geographic Information Systems to assess the agronomic potential of soils. It found that N'Gaous experienced significant urban sprawl, with its land area expanding over ten times and population increasing more than six times, leading to serious issues for peri-urban orchards. The study quantified and monitored the agricultural potential consumed by construction, highlighting the negative impact of urban expansion on agricultural land.

Fatiha Hakimi · Journal of Analytical Science & Technology · Morocco (Rabat)

This study assessed the practices, roles, and challenges of peri-urban farming in the metropolis of Rabat, Morocco, surveying 50 respondents. Peri-urban agriculture is a multifunctional activity contributing to job creation, income generation, food supply, and environmental beautification. However, it faces several constraints, including precarious and costly labor, absence of regulating laws, lack of training and technical supervision for peri-urban farmers, and water resource shortages.

Salvatore Engel‐Di Mauro, George M. Martin · · Global

This chapter examines urban cultivation across diverse global contexts, finding that global South cities often experience declining food production due to displacement by financiers and landowners. It notes that urban cultivation is frequently associated with unacknowledged pollution problems, and its overall ecological impacts are not necessarily positive. Furthermore, urban food production, with the exception of Cuba, does little to reduce social inequality and can sometimes exacerbate it.

Carolina Baldini, Mariana Edith Marasas, Andrea Alejandra Drozd · Journal of Environmental Planning and Management · Colombia

A land-cover change study (Journal of Environmental Planning and Management, 2021) applied a supervised classification of Landsat satellite imagery from 1986, 1996, 2005, and 2015 to Argentina's largest peri-urban horticultural region in South America. Between 1986 and 2015, open-field horticulture extent decreased by 51.47%, while greenhouse area increased by 2652.83%, high-density urbanization expanded by 111.58%, and low-density urbanization increased only between 1986 and 2005—expansion that came at the expense of natural grassland, herbaceous parks, and livestock land. The authors conclude this reflects a regional process of urban growth and productive intensification that has caused losses of open-field horticultural areas and produced a non-equitable distribution of remaining semi-natural areas, and they call for territorial planning that prioritizes ecologically resilient, semi-natural land cover.

Alessio Russo, Giuseppe T. Cirella · Humanities and Social Sciences Communications · Global

This comment examines "edible urbanism 5.0," noting that urban and peri-urban agriculture can have negative effects on city ecosystems, which urbanists and planners have largely overlooked. It highlights the need for a concept that considers trade-offs between ecosystem services and disservices, especially given current unsustainable industrial intensive farming. Edible urbanism aims to integrate food security, resilience, and social inclusion through edible green infrastructure and modern food production.

Ibrahima Saidou · Journal of Environmental Science and Allied Research · Cameroon (Yaoundé)

A 2014 study in Yaoundé, Cameroon, surveyed 40 farmers and analyzed soil in two valley bed suburbs, Nkolodom and Nkolbisson, to identify soil constraints on urban agriculture. While nitrogen and phosphorus levels were adequate, soil salinity at Nkolodom was brackish to moderate (810 mS/m), potentially constraining crop growth. Soil fertility was also found to decrease with distance from farmers' houses.

Delphine Bernadette Ouédraogo, Delwendé Innocent Kiba, Zacharia Gnankambary, Sheick K. Sangaré, Diakouba Sirima, Hassan Bismarck Nacro, Michel Papaoba Sédogo · Journal of Agricultural Science · Burkina Faso (Ouagadougou)

This study investigated cropping practices and their drivers in 133 peri-urban farms near Ouagadougou, Burkina Faso. Soil sample analysis revealed that monoculture led to low soil organic carbon, while polyculture led to low soil available potassium. The socio-economic conditions of the farms explained up to 60% of the variability in cropping practices.

E.N. Sabiiti, Constantine Bakyusa Katongole · Water science and technology library · Uganda

Wakiso district, the peri-urban area surrounding Kampala, Uganda's capital city (population about 1.51 million), ranks first nationally in poultry production and second in pig production, accounting for 7.4% and 6.3% of the national chicken and pig populations respectively. The chapter finds that agricultural land in these peri-urban areas is increasingly at risk from urban encroachment, driven by population growth, distorted land values, a construction boom, and expanding recreation and leisure facilities competing with farming for land, which is likely to adversely affect the city's food security.

Eric Weaver · Suburban Sustainability · Global

This review details the relationship between key planetary systems and the many adverse impacts of industrial agriculture, drawing from top-tier journals. Research indicates that industrial agriculture is a major force pushing environmental limits, with multinational corporations continuing to influence national environmental regulations. Current literature debates whether political systems can institute sustainable solutions, suggesting that grassroots efforts may be the most viable solution to displace the industrial agriculture model.

Danfeng Huang · Journal of Changjiang Vegetables · Global

This paper discussed the importance of intensive vegetable production in urban agriculture, highlighting its role in guaranteeing the supply, quality, and safety of fresh vegetables. It summarized key aspects of intensive production, including industrialized seedling production, facility production, efficient cultivation, postharvest processing, and commercial management, but also presented environmental problems and restricting factors in the development of intensive vegetable production.

Viola Devasirvatham, P. S. Cornish · International Journal of Water · Australia

Peri-urban horticulture in Australia requires irrigation for year-round vegetable production. Subsurface Drip Irrigation (SDI) offers higher water use efficiency and crop yields, with the potential to reduce environmental risks from drainage and runoff. However, SDI has potential disadvantages, including poor germination or crop establishment and uneven wetting patterns. Research is needed to solve these problems and enable environmentally acceptable vegetable production.

M. R. S. Mlozi · Development Southern Africa · Tanzania (Dar es Salaam)

This article discusses urban agriculture in Dar es Salaam, Tanzania, examining its role in helping residents cope with the country's economic crisis. The study also associates urban agriculture with environmental degradation in the city. Factors encouraging urban agriculture at four levels are identified, and concerted efforts at all four levels are suggested to mitigate further environmental degradation.