Research & reports

Juliana Arruda, Nilson Antonio Modesto Arraes, Arruda, Juliana, Arraes, Nilson Antonio Modesto · LA Referencia (Red Federada de Repositorios Institucionales de Publicaciones Científicas) · Brazil

Since 1997, the Municipal Chamber and the executive branch in Campinas, São Paulo state, Brazil, have signaled an intention to place urban agriculture on the political agenda through legislation and regulations governing the Campinas Community Vegetable-Garden Program (CVP). Based on exploratory analysis and interviews conducted in 2005 with program managers, together with documentary sources, this study examined the management of the CVP to inform possible reformulation of the municipality's urban and peri-urban agriculture policy. The analysis found an almost total disconnection between the CVP and the municipality's education, health, and social-action policies.

Shane R. de Solla, Pamela A. Martin · Environmental Toxicology and Chemistry · United States

Because many reptiles oviposit in soil within agricultural landscapes, this study evaluated the toxicity of two commonly used nitrogenous fertilizers — urea and ammonium nitrate — to snapping turtle (Chelydra serpentina) egg survivorship. Eggs were incubated, unmanipulated and under ambient conditions, in a community garden plot treated with urea at realistic rates up to 200 kg/ha in 2004 and ammonium nitrate up to 2,000 kg/ha in 2005, and separately in covered laboratory bins designed to minimize nitrogen loss through volatilization or leaching. In the field, neither urea nor ammonium nitrate affected hatching success or development, despite ammonium nitrate showing overt toxicity to native plants. In the laboratory, however, both fertilizer exposures reduced hatching success, lowered body mass at hatching, and reduced post-hatching survival compared with controls. The authors attribute the field's lack of toxicity to leaching and atmospheric loss of nitrogen in soil, and conclude that nitrogenous fertilizers likely have little direct impact on turtle eggs deposited in agricultural landscapes.

Mure Agbonlahor, S. Momoh, A. O. Dipeolu · International Journal of Vegetable Science · Africa

A sample survey of 242 urban vegetable farmers conducted through March 2006 examined production efficiency and its determinants in fadama agriculture — flood-plain cropping of short-duration crops on low-lying, seasonally flooded land — in urban southwestern Nigeria, using a stochastic frontier model. Mean farm size was 0.54 hectares and mean producer age was 42.6 years, while mean technical efficiency was only 74.36%, with the main sources of inefficiency identified as labor employment and the use of land and seed/cultivar resources; the most common crop combination was Telfaria occidentale, Amaranthus hybridus and Zea mays.

Jonathan Kingsley, Mardie Townsend · Urban Policy and Research · Australia (Melbourne)

A small qualitative study of members of the 'Dig In' community garden in Melbourne, Australia, explored the social capital benefits of urban community gardens. The study found that garden membership offers benefits such as increased social cohesion, social support, and social connections. However, these benefits do not necessarily extend beyond the garden setting, especially in the early stages of development.

Alice J. Hovorka, Damell Smith, R. van Veenhuizen · · Global

This article argues that a gendered perspective on urban food security is essential to understand dynamics shaping food production and marketing in urban centers. It highlights that failing to explore women's distinct roles risks leaving gender inequities and food supply hindrances unaddressed, countering the invisibility of women's work often assumed as automatic domestic duties. The article emphasizes women's significant role in domestic food supply, even in societies with minimal household food production, citing examples like Latin American women organizing to address urban hunger.

Kigumure Buhindwa · Zenodo (CERN European Organization for Nuclear Research) · Rwanda (Kigali)

This study investigated malaria prevention activities in Kigali community gardens, Rwanda, through Community Health Volunteers (CHVs). A mixed-method approach, combining qualitative interviews and quantitative surveys, collected data on CHV activities and health outcomes. CHVs conducted weekly health screenings, reaching approximately 80% of the targeted population, and malaria prevalence dropped by 25% after six months. However, challenges included limited resources and inadequate training for CHVs, indicating that sustained support and additional training are necessary for long-term impact.

Astrid Mendez, Paulo Cseri Ricardo, P Jeny Pérez, Callejas Hernández, Osvaldo Campos · DOAJ (DOAJ: Directory of Open Access Journals) · Cuba

This introductory study in Arroyo Naranjo municipality, Cuba, examined the use of Luyanó effluent wastewater for irrigation in urban agriculture. The wastewater was classified as low contamination based on BOD5 and COD values and posed no toxic contamination risk to soil or environment. However, it should not be used without prior treatment for direct consumption crops due to its microbial load. Experimental plots with carrot, radish, and marigold showed high agricultural yields, and radish harvests had no bacterial contamination.

Juliana Arruda, Nilson Antonio Modesto Arraes · LA Referencia (Red Federada de Repositorios Institucionales de Publicaciones Científicas) · Brazil (Campinas)

A 2005 study in Campinas, Brazil, analyzed the city's Community Garden Program (PHC) to support the formulation of new urban and peri-urban agriculture policies. Analysis of PHC management revealed an almost total disengagement between the program and sectoral policies such as education, health, and social action. However, individual actions were found to be important for project implementation and success, and the projects were significant in the lives of beneficiaries.

Emma Lea, Jodi Phillips, Madeleine Ward, Anthony Worsley · Ecology of Food and Nutrition · Australia (Victoria)

This qualitative study interviewed 20 consumers and 12 farmers in Victoria, Australia, to examine their knowledge, perceived benefits, and barriers regarding Community Supported Agriculture (CSA). The study found that knowledge of CSA was limited among both groups. Consumers perceived fresh food as a benefit but cited lack of produce choice as a barrier, while farmers saw financial benefits but were concerned about risk-sharing.

Edilene Lagedo Teixeira, Janailton Coutinho, Adriano Costa da Silva, Andréa Soares, Camila Silva de Oliveira, Carla Gomes dos Santos, Beatriz Ribeiro Guimarães · REVISTA BRASILEIRA DE AGROECOLOGIA · Brazil

This study, conducted in 2003 by UNISOL REGIONAL and UFRRJ, aimed to develop an organic, condiment, and medicinal garden through social education activities. A socioeconomic survey of the community revealed urgent problems with water scarcity, mosquitoes, and rodents. While two garden beds and 12 planters were built to encourage self-sustaining urban agriculture, the abstract does not explicitly state the success or failure of achieving self-sustainability or addressing the identified community problems beyond the construction itself.

Lily Kiminami, Akira Kiminami · Studies in Regional Science · Japan

Urban agriculture in Japan faces problems such as farmland reduction, farmer aging, expansion of abandoned cultivated land, and environmental pollution from livestock waste or agricultural chemicals. Urban agriculture can contribute to improving urban quality of life by supplying agricultural goods, creating landscapes, ensuring land conservation, and providing environmental benefits like biodiversity conservation. However, these issues pose challenges to the economic viability of urban agriculture.

Mengjie Xu · Urban Problems · Global

This paper summarizes the types and characteristics of urban agriculture (UA) in less developed countries (LDCs), distinguishing it from UA in developed countries. It elucidates both the positive and negative effects of UA in LDCs, including impediments arising from its negative impacts. The study discusses the necessity of developing UA in LDCs and details measures to regulate its development, highlighting governance challenges.

Alice Franck · Revue internationale des études du développement · Sudan

This study of market gardeners in Khartoum, Sudan, reveals limitations in the integrating capacity of urban agriculture. Uncontrolled urbanization in the capital creates intense competition for property, restricting the potential integration of farm-workers in the downtown area. This activity is strictly commercial and primarily carried out by a migrant population.

Patricia Allen, Julie Guthman, Amy Wilson Morris · eScholarship (California Digital Library) · United States (California)

A research brief examining whether alternative food initiatives (AFIs) such as community supported agriculture (CSA) and farmers' markets can meet the food security needs of low-income consumers, based on interviews and surveys of farmers' market and CSA managers throughout California. The authors conclude that AFIs are not, and cannot be, substitutes for state entitlements in meeting the food security needs of low-income people.

Juliana Portela do Rego Monteiro, Maria do Socorro Lira Monteiro · RePEc: Research Papers in Economics · Brazil

A study of 43 urban gardens in Teresina, Piauí state, Brazil, analyzed via primary data collection and field research whether the gardens function as a means of generating work and income and improving socioeconomic conditions without degrading the environment. Most gardeners were women over 45 with incomplete elementary education, earning up to one minimum wage, originally from the state's interior, who had worked in agriculture before joining the gardens and worked them as a family. Most had not participated in training since entering the program, used their own resources for production, concentrated 70.08% of output on cilantro, chives and lettuce, and sold produce mainly on-site; soil amendment relied mostly on manure with limited chemical fertilizer, and only 36.81% of gardeners used pesticides. The study concludes that low remuneration, stemming from limited crop diversity, poor organization and lack of financing, led some family members to seek alternative income.

Soren T. Anderson, Sarah E. West · Regional Science and Urban Economics 36(6): 773-789 · United States (Minneapolis-St. Paul)

A hedonic analysis of home transactions in the Minneapolis-St. Paul metro area finds that the value of proximity to open space is higher in dense neighborhoods, those near the central business district, high-income, high-crime, or with many children. Warns that applying the metro-wide average value to a specific neighborhood can substantially overestimate or underestimate what open space is worth there.

Nkawkaw Afriyie, Kofi Adziri, Yaw Asare, Amoako Gyamfi · Zenodo (CERN European Organization for Nuclear Research) · Ghana

A thematic analysis synthesized existing studies on community gardening impact measurement in Accra, Ghana, focusing on methodologies. While varied methods were reported, a notable theme emerged regarding the mixed results and challenges in accurately gauging the impact of community gardening on urban food security indicators, such as vegetable consumption rates among participants. This review underscores the importance of empirical data for understanding the effectiveness of urban agricultural interventions, but highlights methodological inconsistencies.

Oumar Cissé, Ndèye Fatou Diop Gueye, Moussa Sy · Environment and Urbanization · Africa

This paper reports on research and city consultations in seven West African cities, examining the institutional aspects and constraints of urban agriculture. Despite growing interest from public authorities, this has not led to effective consideration in institutional and legal provisions in most countries. Decentralization processes have also not resulted in city government commitment to support urban agriculture, and its legal status remains uncertain.

Yali E. Woyessa, Etheresia Pretorius, Pieter S. van Heerden, M. Hensley, L. van Rensburg · WIT transactions on ecology and the environment · South Africa

This field survey in the Modder River basin, South Africa, investigated the potential expansion and implications of a rainwater harvesting technique introduced to small-scale farmers. While a rapid spread within home yard sizes was expected, no significant spread to community gardens or beyond was anticipated in the short term. This limitation was attributed to socio-economic constraints, including poverty and a lack of appropriate tools and basic farming skills.

Alice J. Hovorka · Annals of the Association of American Geographers · Africa

This study empirically examines the effects of gender on commercial urban agriculture in Greater Gaborone, Botswana, using a conceptual framework bridging sociospatial and human-environment geography. It found that gender clearly shapes both the quantity and type of foodstuffs produced for the urban market, with men and women farmers entering production and participating in this economic sector on unequal terms defined by socioeconomic status, location, and environmental interaction. The study argues that gender relations of power, as produced through sociospatial and human-environment relations, remain an unequal structuring force in the sector that must be accounted for if urban agriculture is to support food security and economic growth.

Samantha Langley-Turnbaugh, David E. Wilkinson, D. Rocque · Soil Survey Horizons · United States

This study characterized urban soils in a low-income neighborhood of Portland, Maine, that was heavily industrialized in the late 1800s, examining seven pedons for particle size, cation exchange capacity (CEC), base saturation, exchangeable bases, pH, and trace elements (Pb, Cr, Cu, Co, Cd, Ni, Zn, Hg, Ti, Zr). The soils contained numerous artifacts and showed a high degree of horizontal and vertical spatial variability; several trace elements were present at elevated levels, with lead (Pb) the dominant metal in surface horizons (600 mg/kg), and many metals correlated with each other and with iron and aluminum, and some with clay content and pH, though the study concludes that mapping soil units by specific trace element ranges would be difficult given the extreme variability observed.

Troy D. Glover · Leisure Sciences · Global

This 2004 global narrative inquiry explored a community garden as a social context for social capital among gardeners. The study found that social capital can be both a benefit and a cost, depending on an individual's position within the social network. This suggests a potential for inequitable or corrupt application of social capital within community garden groups.

Anne C. Bellows · Food and Foodways · Poland

Polish allotment gardeners collectively represent the largest land managers in Poland, with a formalized urban allotment food production system dating back to 1997. This system, combining local and national government policy with NGO management and private use, provides a model for food security and urban open space. However, this arrangement also creates ongoing tension among stakeholders and a contentious debate regarding the private and public uses of urban land.

Laura Lawson · Journal of Planning History · United States

This historical review of US community garden programs since the 1890s reveals an ambivalent relationship between community gardens and the planning profession. While praised for serving environmental, social, and individual objectives, community gardens are largely ignored in long-range planning due to being perceived as opportunistic and temporary. This highlights unresolved tensions between professional planning and civic concerns, and between comprehensive planning and local interventions.

Rocío García Bustamante, John Butterworth, M. Flierman, Daniel Herbas, Melvin Hollander, S. van der Meer, P. Ravenstijn, Magaly Reynaga, Gustavo Zurita · · Bolivia (Tarata)

In 2002, Tarata, Cochabamba, Bolivia, experienced violent conflicts over the right to use water from the Laka Laka dam for urban agriculture. The dam was intended for large-scale irrigation and domestic use, but not urban productive uses, leading to disputes when the urban population sought water for homestead cultivation. Although 5% of the reservoir yield was allocated for urban supply, its poor quality prevented drinking use, prompting the community to organize for its use in irrigating small plots, despite opposition from irrigation farmers.