Research & reports

James M. Wolf, M S van Wijk, X Cheng, Yuanhao Hu, C.A. van Diepen, A.W. Jongbloed, H van Keulen, C H Lu, R.P. Roetter · Environment and Urbanization · China (Beijing)

This paper reviews agricultural production trends in Beijing Municipality and their impact on water quality. Rapid urbanization and agricultural intensification have led to concerns regarding water resource quantity and quality. The agricultural sector, while supplying food, is a major water user and has contributed to significant water supply-demand gaps and high levels of water pollution, particularly from intensive crop, vegetable, and livestock production.

Grace K. Luk · WIT transactions on ecology and the environment · Canada (Greater Toronto Area)

This paper describes the design and data collection for an on-site evaluation to quantify the benefits of greenroof systems, focusing on six greenroof systems in the Greater Toronto Area, Canada. The study's objective is to specifically quantify the multiple benefits greenroofs provide, such as improved stormwater management, air quality, increased energy efficiency, extended roof life cycle, and mitigation of the Urban Heat Island Effect. A long-term, real-time monitoring program is intended to help define the ecological and hydraulic benefits of these greenroofs.

Innocent Nhapi, Huub J. Gijzen, Maarten A. Siebel · Water Science & Technology · Zimbabwe (Harare)

This study aimed to formulate an integrated wastewater management model for Harare, Zimbabwe, integrating resource recovery and reuse in urban agriculture. Harare was divided into five major operational areas, and specific options were considered to suit land use, development constraints, and socio-economic status within the overall criteria of limiting nutrient inflows into Lake Chivero. Flexible and differential solutions were developed in relation to the built environment, population density, user composition, ownership, future environmental demands, and technical, environmental, hygienic, social, and organizational factors.

María Caridad Cruz, Roberto Sánchez Medina · · Cuba (Havana)

This book details a three-year research project by a multidisciplinary team of 15 professionals on the history and current state of urban agriculture in Havana, Cuba. The project assessed the long-term potential of integrating urban agriculture into Havana's social economies and city-wide environmental management programs. The findings are relevant for authorities considering how to transition emergency food production into sustained support for urban agriculture, aiming for food self-reliance and environmental improvement.

LI Ya-hong · Nongye xiandaihua yanjiu · Global

This paper describes urban agriculture as a modern agricultural industry shaped by metropolitan regions and socio-economic circumstances. Its main characteristics include a perfect market system, aggregated production patterns, industrialized management, high-tech production, and the harmonization of three agricultural benefits. Beyond commodity production, urban agriculture should also offer direct and indirect multifunctions such as ecological construction, leisure tourism, cultural education, export, and demonstration.

Nyuk Hien Wong, Vi Ling Wong, Yu Chen, Siew Eang Lee, David Cheong, Guan Tiong Lim, Chui Leng Ong, Angelia Sia · Architectural Science Review · Global

This study explored the potential of rooftop gardens to reduce heat gain into buildings and modify ambient conditions through plant photosynthesis and evapotranspiration. Results suggest that rooftop gardens can effectively cool the immediate ambient environment by 1.5°C. Surface temperature readings from rooftop gardens were lower than those on barren concrete rooftops, indicating improved thermal insulation in the presence of plants. However, high relative humidity was also observed in rooftop gardens due to plants, requiring adequate natural ventilation to prevent discomfort.

Charles W. Howe · Environment and Development Economics · Global

This study noted that in inappropriate legal and administrative settings, groundwater becomes an open-access resource, leading to excessive externalities. Competition between urban and agricultural sectors for limited groundwater can lead to crises if appropriate policy instruments are not used to mediate it. For non-renewable groundwater stocks, without economic and demographic development planned according to long-term criteria, there is a risk of overly rapid exploitation, unsustainable population levels, and inappropriate infrastructure investment.

Patrick Henn, John Henning · International Journal of Environment and Sustainable Development · Cuba (Havana)

This paper argues for an extended assessment of the total economic value of urban agriculture (UA), encompassing social, environmental, and economic benefits, to inform optimal decisions on its role in urban sustainability. It presents results from a contingent valuation study on the value of popular gardens in Havana, Cuba. The abstract notes that despite significant benefits, UA remains marginalized in urban planning.

E. Makumbelo, L. Lukoki, Sj. Paulus, J., N. Luyindula · DOAJ (DOAJ: Directory of Open Access Journals) · Democratic Republic of Congo (Kinshasa)

A survey conducted in 201 plots within the Limete commune of Kinshasa, Democratic Republic of Congo, inventoried nineteen cultivated vegetable species and 764 plants from 18 fruit-tree species. Mangifera indica was identified as the most planted tree species, while Ipomoae batatas was the most frequently cultivated vegetable species.

Nigel Poole, DS Bhupal, Fiona Marshall, Dolf te Lintelo · · India

New knowledge is presented on the impacts of urban and peri-urban (UPU) environmental pollution on food safety attributes of vegetable marketing systems in India. Air pollution reduces crop yield and nutritional quality, and is a major source of particulate contaminants that accumulate at toxic levels in edible crops. The study explores the balance between public and private quality assurance initiatives and identifies wholesale markets as a potential entry point for quality assurance.

Gina E. Castillo, S. Langeveld · WIT transactions on ecology and the environment · Africa

This paper examines the contributions of civil society organizations working on urban agriculture in Africa and Latin America. It argues for the need to develop land use policies that incorporate the social, economic, and environmental benefits of urban gardens. The paper concludes that both urban agriculture and civil society organizations are essential for creating livable cities.

Ren Wei-na · · China (Beijing)

This analysis states that the development of urban agriculture in Beijing aligns with current productivity demands. Urban agriculture is considered important for solving land and water resource shortages, fulfilling environmental protection and recreational functions, and promoting bidirectional development between town-suburbanization and suburb-urbanization.

Ausaf-ur Rahman, Mohammad Ait Kadi, Johan Rockström · Water Science & Technology · Global

A synthesis paper from a 2002 workshop reports that competing demand for water between agriculture and urban users is generating severe stress on water resources, with virtual water trade (importing food instead of pursuing self-sufficiency, to conserve real water resources) and water reuse (irrigation with treated urban wastewater) emerging as the two dominant proposed responses. It states that virtual water trade carries serious political and economic risks, with one proposed remedy being an international virtual water trading council.

E. Mensah, Philip Amoah, Robert Clement Abaidoo, Pay Drechsel · CGSPace A Repository of Agricultural Research Outputs (Consultative Group for International Agricultural Research) · Ghana

This document presents case studies on environmental concerns related to urban and peri-urban vegetable production in Kumasi and Accra, Ghana. It is part of a larger work on waste composting for urban and peri-urban agriculture in Sub-Saharan Africa.

Robyn Lynn · ResearchOnline at James Cook University (James Cook University) · Global

This paper highlights the significance of urban food production, which has been historically neglected despite its potential to address issues of globalization, urbanization, and environmental degradation. It explores the relationship between cities, food production, and activism, noting a growing local food movement that resists global food discourses. The paper aims to identify issues within urban food production activism and its organizational aspects.

Frank Lohrberg · OPUS Publication Server of the University of Stuttgart (University of Stuttgart) · Global

This study argues that agricultural production forms near cities, often overlooked by municipal and environmental policy, are innovative, consumer-oriented, and economically efficient. It suggests that urban and and open space planning should abandon the prejudice that agriculture on the city outskirts is an outdated model. A differentiated view reveals an "urban" agriculture that is more vital than its rural counterpart and can provide important impulses for more sustainable cities and efficient planning.

王雪梅 · 山西农经 · China (Taiyuan)

This paper discusses the "comprehensive urban diseases" resulting from urbanization, such as population concentration, traffic congestion, and environmental degradation, which threaten human health and well-being. It notes that as cities increasingly move away from nature, urban residents long for rural landscapes, prompting a call for green industries to return to cities. "Urban agriculture" has thus emerged in some large cities in China as a response to these challenges and a path towards sustainable urban development.

Tjeerd Deelstra, Herbert Girardet, N. Bakker, Marielle Dubbeling, S. Gündel, U. Sabel-Koschella, H. de Zeeuw · · Global

This text describes humanity's transformation into an urban species by the end of the 20th century, with large cities becoming the primary habitat. It notes that global urban populations expanded from 15% to 50% of the total population within one century, while the total population grew from 1.5 billion to nearly 6 billion. The text highlights the unprecedented size of modern cities, citing that by 1990, the 100 largest cities housed 540 million people.

P. Kreinecker, N. Bakker, Marielle Dubbeling, S. Gündel, U. Sabel-Koschella, H. de Zeeuw · · Bolivia (La Paz)

This abstract describes the geographical and administrative context of La Paz, Bolivia, and its suburb El Alto. La Paz is situated at 3,600-3,800 meters above sea level, with El Alto located at 4,000-4,100 meters. The city lies in a basin with suburbs extending into the surrounding hills and mountains.

Kevin W. King, J. C. Balogh · Transactions of the ASAE · Global

This study developed a first-order decay equation to model the nitrogen release rate of sulfur-coated ureas (SCUs), prevalent in urban agricultural management. The model was fit with reasonable accuracy for both surface (Efficiency R²=0.63) and incorporated (Efficiency R²=0.70) applications. Temperature and seven-day dissolution were determined as best descriptive parameters for the surface model, while soil moisture and temperature were used for the incorporated model. Each model was validated with a limited amount of data, showing prediction efficiencies of 0.82 for surface and 0.63 for subsurface applications.

K. Haggard, Phillip J. Cooper · Solar today · United States (California)

The Tierra Nueva Cohousing Project in California comprises living units, a common house, community orchard, community gardens, play space, future shop space, and parking. The units incorporate thermal mass, solar heating, passive solar cooling, and perimeter insulation on slabs. The design of the project was collectively agreed upon by the entire community.

J.B. van Lier, G. Lettinga · Water Science & Technology · Global

This paper discusses integrated environmental protection and resource conservation (EP&RC) concepts for managing industrial and domestic wastewaters, particularly in water-scarce regions. EP&RC aims for minimal consumption of energy, chemicals, and water, and maximal reuse of treated wastewater and residues, transforming wastes into resources for water, fertilizers, and soil conditioners. Anaerobic treatment is presented as a core technology for mineralizing organic compounds, stimulating urban agriculture near large cities by linking environmental protection and agricultural practices.

H. Losada, H. Martínez, J. Vieyra, R. Pealing, R. Zavala, J. Cortés · Environment and Urbanization · Mexico

This paper describes the scale and nature of agricultural production in urban, suburban, and peri-urban zones of Mexico City and how these have adapted to changing urban demands for food, wood, and recreation. Agricultural producers have successfully adapted their products and production methods, including building on traditional systems, despite environmental deterioration from urban development and lack of government support. These producers have also devised new ways to use degraded land and large volumes of waste.

Nicholas P. Dunning, Timothy Beach, David J. Rue · Ancient Mesoamerica · Guatemala

This study of the Petexbatun region, Guatemala, found that ancient Maya peoples in Preclassic times cleared large areas of upland tropical forest for agriculture, leading to significant soil erosion. During the Late Classic period, population expanded, forest clearance resumed, and upland agriculture, including terracing, was practiced, which significantly checked soil erosion. The study suggests considerable variation in urban agriculture among the region's major centers.

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.