Research & reports

K. C. Sahu, M. K. Satapathy · International Journal of Agriculture Extension and Social Development · India

This paper discusses rooftop gardens as an alternative for vegetable production in Bhubaneswar City, India. While rooftop agriculture can improve ecosystem services and enhance urban biodiversity, vegetable production activities on rooftops are limited due to multiple challenges that need to be addressed for widespread implementation. Rooftops are not a total solution for food security but can supplement other urban food sources.

Stefanie Albrecht, Arnim Wiek · Journal of Agriculture Food Systems and Community Development · Global

This study compiled evidence from over 200 food forests worldwide, with detailed insights from 14 exemplary food forests in Europe, North America, and South America, gained through site visits and interviews. Findings indicate that most food forests perform well on social-cultural and environmental criteria, such as building capacity, providing food, enhancing biodiversity, and regenerating soil. However, for broader impact, food forests need to enhance their economic viability, as they currently show a deficit in this area.

Kyla D. Scherr, Mary A. Jamieson · Basic and Applied Ecology · United States (Michigan)

This three-year study investigated environmental factors influencing strawberry productivity for two cultivars at ten farms across a rural-urban gradient in Michigan, USA. It found no direct effect of urbanization on strawberry production or fruit pathogen and pest damage, but temperature significantly influenced crop productivity, with cooler rural and warmer urban temperatures limiting fruit number. While no relationship was found between urbanization and overall arthropod pest, predator, or pollinator abundances, Vespidae abundance was positively associated with urbanization, and Araneae abundance was negatively associated.

Mun Gi Hong, Bo Eun Nam · Journal of Character Education and Research · South Korea

This study analyzed the suitability of G National University's campus as an educational site for ecological and character education for elementary students. The campus had a green space ratio of approximately 40% and 120 woody plant species. However, vulnerabilities in plant diversity were identified, including a bias towards certain species like oak and azalea, and multiple species concentrated in small numbers. A critical finding was the overlapping flowering and fruiting seasons for most species, which could negatively impact the ecology of wild animals like insects and birds that rely on these resources.

Anna Barra Caracciolo, Valentina Terenzi · Microorganisms · Global

A review of the rhizosphere as a microhabitat of intense chemical dialogue between plants and microorganisms covers synergistic interactions that can enhance plant function and productivity, including responses to stress conditions such as heavy metal (HM) contamination, alongside the risks such contamination poses. Where heavy metals are present in agricultural soils, there is a risk of metal uptake by edible plants leading to bioaccumulation in humans and animals with detrimental health consequences, and plant productivity itself can be negatively affected; many bacteria have defensive mechanisms for resisting heavy metals and can improve plant responses to HM stress, but achieving such beneficial rhizosphere interactions is described as hard to attain in agroecosystems managed with traditional practices that focus on maximizing crop yield.

Olga Romanova, Sarah Taylor Lovell · Urban Agriculture & Regional Food Systems · Global

This review assesses the capacity of woody species (trees and shrubs) used in urban food forests to accumulate polycyclic aromatic hydrocarbons (PAHs), heavy metals (HMs), and metalloids, given limited existing literature on food-safety risk in urban fruit- and nut-producing trees compared with annual crops. General trends identified were (a) lower risk of HM and PAH accumulation in woody species than in vegetables, and (b) less accumulation in the fruit of woody species than in other parts of the same species. However, these trends are not always consistent, and accumulation depends on factors such as the concentration of a given contaminant in the environment, contaminant type, and species or variety. The review states there is a critical need for more research on the safety of growing edible fruits and nuts on trees and shrubs in contaminated urban environments.

Maha Deeb, Peter M. Groffman, Manuel Blouin, Sara Perl Egendorf, Alan Vergnes, Viacheslav Vasenev, Donna L. Cao, Daniel C. I. Walsh, Tatiana Morin, Geoffroy Séré · SOIL · Global

This review examines the use of Constructed Technosols (CTs), mixtures of organic and mineral waste, for green infrastructure (GI) in urban spaces. While CTs have high potential to provide multiple soil functions and contribute to urban greening, urban soils are often physically, chemically, or biologically unsuitable for GI features. The analysis suggests that the composition and structure of CTs should be adapted to available wastes and by-products, as well as future land use and environmental conditions, highlighting the need for careful design to overcome existing limitations.

Dávid Korányi, Róbert Gallé, Bettina Donkó, Dan Chamberlain, Péter Batáry · Urban Ecosystems · Germany (Göttingen)

This study in Göttingen, Germany, investigated the effects of green space (GS) types and surrounding urbanization on bird communities. Bird observations were conducted using the point-count method in allotments and parks, with urbanization levels measured by the percentage of impervious surfaces. Increasing levels of urbanization around green spaces had no effect on bird species richness, functional traits, or community composition.

Maëlle Tripon, Dorothée Boccanfuso, Marie-Ève Yergeau · Cahiers de recherche · Global

This literature review examines urban agriculture (UA) models, their implementation contexts, production needs, and impacts. It highlights that UA faces limitations, particularly restricted access to good quality (unpolluted) soil, water, and air, which can negatively impact productivity. UA can also have negative impacts on ecosystems and human health, such as pollution and diseases, depending on management methods.

Kit Prendergast · Pacific Conservation Biology · Australia

The African carder bee, Pseudoanthidium (Immanthidium) repetitum, first recorded in Queensland in 2000, has now been found in Western Australia, marking a significant distribution expansion. Three confirmed and one unconfirmed localities were identified in the Mandurah region, with abundant female specimens observed in one garden. The presence of this introduced species necessitates vigilance due to known negative impacts on native fauna and flora.

Noiry Pérez Pompa, Santa Laura Leyva Rodríguez · Sinergia Académica · Cuba

A diagnosis of farms infested by Dichrostachys cinerea (marabú) in urban and suburban agriculture was conducted at Los Téllez farm in Becerra, Las Tunas municipality, Cuba. Soil quality indicators for reddish-brown Fersialitic soils over granitoids were evaluated across four land-use systems: two infested by D. cinerea and two agricultural systems cultivated for 10 years after marabú deforestation. Results showed that D. cinerea systems exhibited the highest soil quality index, based on organic matter, bulk density, and earthworm biomass. Conversely, cultivated systems achieved the lowest accumulation of organic carbon, oligochaete density and biomass, and total porosity.

Jeroen Schütt, Bas Amelung · · Europe

This research, conducted by the Science Shop of Wageningen University and Research, estimated the monetary value of ecosystem services in the Lutkemeerpolder, Amsterdam, which is slated for conversion into a business park. The study identified food production, air purification, recreation, and the effect of greenery on housing prices as key services, valuing them at 1.5 to 8.6 million euros per year. These ecosystem service values were not considered in the original decision-making twenty years ago, leading to a recommendation to reconsider the development plan.

Moisés Savian, Mari Inês Caríssimi Boff, Pedro Boff · Cadernos de Agroecologia · Brazil

This study evaluated Brazilian scientific production from 2009 to 2018 on urban agriculture's contribution to food and nutritional security, analyzing 34 selected articles out of 612. It found that while agrobiodiversity is present in urban agriculture areas, pesticide use is a reality in some crop plots. The research suggests urban agriculture must be based on agroecology to avoid environmental contamination and produce healthy food.

Esther Sanyé‐Mengual, Kathrin Specht, Jan Vávra, Martina Artmann, Francesco Orsini, Giorgio Gianquinto · Sustainability · Italy (Bologna)

This study compared perceptions of urban agriculture (UA) ecosystem services (ESs) among different societal groups in Bologna, Italy, namely UA project leaders, stakeholders, and the general public, with 406 individuals evaluating 25 ESs via a standardized Likert-scale survey. Statistical analysis indicated that the general public and UA stakeholders agreed on the high relevance of socio-cultural ESs, while provisioning ESs were considered less significant. This study reveals a lower perception of provisioning ESs from urban agriculture.

Jennifer Engels, Sheree J. Watson, Henrietta Dulai, Kimberly Burnett, Christopher A. Wada, ‘Ano‘ilani Aga, Nathan DeMaagd, J. J. McHugh, Barbara Sumida, Leah L. Bremer · PLoS ONE · United States (O‘ahu)

A researcher-farmer collaboration on O‘ahu's Sumida watercress farm conducted a 25-year trend analysis and a year of intensive spring water sampling. Negative correlations were found between historical crop yields and increases in the Oceanic Niño Index, temperature thresholds, and pest outbreaks. Despite urbanization, on-farm water quality was very high, and microbial analyses suggested the farm provides nutrient retention services to downstream systems. The study demonstrates that challenges facing urban agricultural systems shift over time.

Catalina Cruz-Piedrahita, Caroline Howe, Audrey de Nazelle · Global Transitions · Global

This scoping review analyzed 138 papers to develop a conceptual framework on the impacts of urban horticulture (UH) on public health in the Global North. While UH is proposed as a tool for health improvement, the review notes a lack of systematic information on its benefits, barriers, costs, and risks in these regions. The framework visualizes relationships between UH and public health, providing evidence for both positive and negative connections regarding mental health, physical activity, diet, and socialization.

F. Feldmann, Ute Vogler · Journal of Plant Diseases and Protection · Global

Ten key challenges for plant protection in cities were identified, each belonging to a specific field of action of Integrated Pest Management (IPM) in urban horticulture, according to Directive 2009/128/EC. These challenges include appropriate plant selection, microbiome engineering, nutrient recycling, smart digital solutions, diversification of vegetation, avoidance of pesticide side effects on beneficials, biorational efficacy assessment, effective pest diagnosis, efficient outbreak control, and holistic approaches.

Lexi Earl, Pat Thomson · · United Kingdom (midlands in England)

This chapter examines a school garden with farm elements at a primary school in a deprived market town in the midlands of England, established as part of an 'eco-school' initiative driven by the former head teacher. The garden included various spaces like a farm, raised beds, a pond, and a herb garden, used for science learning and natural exploration. However, the study notes that the impetus for outdoor learning diminished after the initiating head teacher departed, as school priorities shifted due to other pressures.

Jha Ritesh Kumar, Bhattarai Natasha, KC Suraj, Shrestha Arjun Kumar, Kadariya Manahar · Malaysian Journal of Sustainable Agricultural · Nepal

This research inspected existing practices and obstacles in rooftop farming in Nagdhungha and Birauta, Nepal. Two practitioners were interviewed and 60 non-practitioners were surveyed. Results show that rooftop farming can benefit the environment by reducing atmospheric carbon and assist urban areas by reducing stormwater management costs, with a high willingness to practice rooftop farming among urban dwellers.

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.

Simon Tresch, David Frey, Renée‐Claire Le Bayon, Paul Mäder, Bernhard Stehle, Andreas Fließbach, Marco Moretti · Scientific Reports · Switzerland (Zurich)

A study in 85 urban gardens across Zurich, Switzerland, investigated the impact of gardening on five soil functions and the relationship between plant (600 spp.) and soil fauna (18 earthworm spp., 39 springtail spp.). High plant diversity positively affected soil fauna and multifunctionality, but intense garden management decreased plant diversity. This indicates a trade-off where intensive gardening, while potentially beneficial for some aspects, can negatively impact overall plant diversity.

Emmanuel Patroba Mhache, Elna Lyamuya · Huria Journal of the Open University of Tanzania · Tanzania (Dar es Salaam)

This review paper examined the role of urban agriculture in alleviating poverty for women in the Dar es Salaam Region, Tanzania. It found that women's participation in urban agriculture contributes to food security, increases household income (average net income Tshs 58,356.2 per month), offers employment, and reduces poverty. However, numerous bottlenecks hinder women's involvement in urban agriculture, including poor markets, water shortage, land shortage, seed unavailability, lack of capital, lack of government support, crude working tools, lack of water pumping machines for irrigation, poor storage facilities, and lack of agricultural extension services.

Nicolás A. Mari, Nicolás A. Mari, Beatriz Giobellina, Beatriz Giobellina, Alejandro Benítez, Alejandro Benítez, Victoria Marinelli, Victoria Marinelli, Victoria Marinelli · Journal of Agronomy Research · Argentina (Córdoba)

A study mapped and quantified urban growth and land use in Córdoba, Argentina's Green Belt. Using remote sensing and GIS, it evaluated urban growth between 1974 and 2014 and land use in peri-urban and rural areas in 2015. The study revealed a 46.5% urban area growth over nearly 40 years, alongside an increase in farm plot size, indicating land ownership concentration and a reduced number of producers. This transformation highlights a conflict between peri-urban horticulture, industrial agriculture, and urban development.

Satyendra Kumar Pothula, Parwinder S. Grewal, Robert M. Augé, Arnold M. Saxton, Ernest C. Bernard · Journal of Nematology · Global

A meta-analysis of 111 published articles assessed the impact of human interventions on soil nematode richness and abundance in urban, agriculture, and disturbed grassland ecosystems compared to natural grassland and forest ecosystems. The study found that overall nematode richness was higher in forest ecosystems than in natural grassland, disturbed grassland, urban, and agriculture ecosystems. The meta-analyses concluded that human interventions, specifically agricultural intensification and urbanization, adversely impact both the richness and abundance of nematodes, which serve as soil health bioindicators.

gökçe öcal · Journal of Planning · Turkey (Istanbul)

This study focuses on the Roma Garden, one of Istanbul's last remaining urban gardens, within the context of "DIY urbanism." In Istanbul, historical gardens are threatened by municipal policies favoring urban development, leading to the formation of "DIY" urban gardens on public land since 2013. These gardens operate without legal ties to the local state, and the destruction of urban public space over the last decade is noted as having paved the way for DIY public gardens as spaces of solidarity and shared knowledge.