Research & reports

Matilda Thelin · · Sweden

This qualitative study in peri-urban Uppsala, Sweden, identifies driving forces influencing land use decisions by commercial farmers and institutional landowners. It notes that approximately 700 hectares of land in Sweden are diverted from food production annually, with Uppsala Municipality showing the greatest change in 2013. The expropriation of agricultural land for urban development leads to farmers losing land resources and increased competition for remaining land, resulting in high land prices.

Suarau Odutola Oshunsanya, Tolafe Olayinka Adeniran · Agricultura tropica et subtropica · Nigeria (Ibadan)

A field experiment in Ibadan investigated the quality of irrigation water used for dry season vegetable cultivation along Ona-stream. Water samples from five isolated ponds and one locally dug well were analyzed for heavy metal status. Results showed high concentrations of Pb, Cr, and Co in soil from five farms (A-E) near the stream, and isolated pond water also contained Cr, Co, and Pb exceeding safe consumption thresholds. All vegetables irrigated with untreated isolated ponds contained Cd, Pb, and Ni concentrations above maximum permissible standards, posing potential risks to human health.

Eric Vaz, Marco Paìnho, Peter Nijkamp · European Planning Studies · Europe

This paper presents a spatial analysis integrating agricultural land use data inventories for Portugal with CORINE Land Cover data to assess change in the Algarve region. By overlaying the appropriation of agricultural land for urban use with population and urban data, it focuses on the consequences of specific regulations for the dynamics of land-use change. An integrated assessment of agricultural land loss found that agricultural land was being undermined by the consequences of urban sprawl. Building on this finding, the paper reviews existing decrees supporting sustainable development in the region, provides a qualitative assessment of future roles based on ethical values and economic efficiency, and offers a framework for policymakers regarding trends in the urban/agricultural dichotomy.

Shengqi Xu · Shipin yanjiu yu kaifa · China

A 2014 paper examines development strategy for the modern agricultural food product industry in Wuqing District, Tianjin, China. It proposes developing Wuqing into a supply base for high-quality agricultural products and a comprehensive urban agriculture demonstration area for the Beijing-Tianjin region by drawing on university scientific talent, research outputs, and platforms, raising the level of industrialization, standardization, systemization, branding, and functionalization of agricultural facilities and zones, and strengthening characteristic agriculture in vegetables, cattle, fisheries, livestock and poultry, and forestry and fruit.

Bruno Ronchi, A. Amici, Carlo Maía Rossi, Riccardo Primi, Rita Biasi, Maria Nicolina Ripa · Hábitat y Sociedad · Italy

A 2014 study performed a multi-temporal analysis of land use change over the past 80 years in two small medieval towns in central Italy (Viterbo province, Lazio region), using photogrammetric restitution of historical aerial flights. Results showed that within the city walls a variable number of green spaces and small backyards remained as of 2010, and that in the suburban areas residual agricultural activity persisted, mainly fruit and vegetable cultivation, likely for local markets and/or home consumption. It states that urban planning should account for the functional links between urban and agricultural areas that sustain urban gardening and subsistence economies.

Alain Peoule Kouhouyiwo GOMGNIMBOU, Birjees Hassan, A. Sanon, P.M. Sedogo, Martinez, J. · HAL (Le Centre pour la Communication Scientifique Directe) · Africa

A study evaluating the effect of pig and cattle manure application on soil chemical parameters of Lixisols in the Bobo-Dioulasso area of Burkina Faso, framed around the potential for organic waste fertilizers in urban and peri-urban agriculture to maintain soil fertility and support food security. Eight farms using animal waste and some non-cultivated plots were identified in 2012, and soil samples were taken for chemical analysis. Pig manure use lowered soil pH (H2O) by 0.46 units at 0-10 cm depth and 0.51 units at 10-20 cm, while increasing organic carbon and nitrogen content and easily absorbed phosphorus at both depths. Cattle manure use raised total potassium to 1,210 ppm at 0-10 cm and 1,351 ppm at 10-20 cm, and cation exchange capacity (CEC) to 7.18 meq/100g, about three times that of unmanured plots. The study concludes animal manure could be an alternative to costly chemical fertilizers.

남선모 · · South Korea

Against the background of a growing population of people returning to farming or rural villages in South Korea, this paper reviews problems such as overlapping burden fees and terminological confusion arising from farmland conversion. In connection with the implementation of the Act on the Promotion of Urban Agriculture, it notes that the number of urban residents cultivating home gardens in city centers is projected to reach about 2 million by 2017, and that the Ministry of Agriculture, Food and Rural Affairs had formulated a first Five-Year Urban Agriculture Promotion Plan (2013-2017) that would revise the Act on Urban Parks and Green Areas — previously cited as an obstacle — to allow urban agriculture facilities to be installed within city parks.

Nicole M Reese · USF Scholarship Repository (University of San Francisco) · United States (California)

This study assessed the feasibility of rooftop farming in the Small Business Mix Zone of West Oakland, California. The area has more than one million square feet of untapped rooftop space, and selling produce grown there at local farmers markets, produce stands, grocery stores, businesses, and restaurants could generate up to $4 million in revenue. Rooftop production would help the City of Oakland meet its goal of 30% locally sourced food and supply fresh fruits and vegetables to West Oakland, a food desert currently lacking access to them.

Achamyeleh Gashu Adam · African review of economics and finance · Ethiopia

In Ethiopia, all land is state-owned and granted to residents only as a holding right, with separate systems for rural and urban areas. Focusing on peri-urban agricultural land under growing pressure from urbanisation, this desk-review study analyzed existing survey research together with property-rights literature, theory, and current land-rights laws and policies. It found that new recipients of peri-urban land under the urban land-lease system obtain better and more extensive bundles of land rights than the indigenous, local peri-urban landholders who previously held that land.

Serge Bonnefoy · SHILAP Revista de lepidopterología · France

This paper traces the historical trajectory of peri-urban agriculture in France, starting from the history of the Town/Country dualism and the phases of politicization of peri-urban agriculture, and examining the development of agglomeration policies into which agriculture has become embedded, identifying five distinct types of agricultural agglomeration policy. It describes the movements currently renewing peri-urban agriculture policy: the pursuit of sustainable cities (including opposition to urban sprawl), the food issue (strengthening agriculture's production function), and a return to a territorial economy. The paper focuses on the uncertainty of this policy argument and how it is exploited by different policies.

Y. Saleh, Amul M. Badr, F. El Banna, A. Shahata · Science World Journal · Nigeria

Using a combination of remote sensing and GIS, this study assessed the rate of agricultural land-use change in the Kaduna metropolis, Nigeria, between 1980 and 2012, classifying and comparing four satellite images (Landsat MSS 1980, Landsat TM 1990, Landsat ETM+ 2005, and Nigeria Sat X 2012). The study found a significant reduction in agricultural land and continued disappearance of farmland over the period, which it links to loss of livelihoods, reduced food supply, and increased poverty. It states that this has raised concerns about the sustainability of urban and peri-urban agriculture (UPA) production in the study area, with small-scale farmers the most affected.

Misha Leong, Claire Kremen, George Roderick · PLoS ONE · United States (California)

This study investigated pollinator-plant interactions in a periurban landscape on the outskirts of the San Francisco Bay Area, California, where urban, agricultural, and natural land uses interface. Using standardized observations of floral visitation and measurement of seed set in yellow starthistle (Centaurea solstitialis), a common grassland invasive, it tested the hypothesis that increasing urbanization would decrease bee visitation rates, viable seed set, and pollination efficiency (the relationship between bee visitation and seed set). Contrary to expectation, bee visitation was found to be highest in urban and agricultural land use contexts. However, seed set rates in these human-altered landscapes were lower than in natural sites. The study attributes this mismatch between visitation and seed set to higher plant diversity in urban and agricultural areas — driven by more introduced species — which reduces pollinator efficiency. If consistent across other plant species, the novel plant communities and generalist bee species favored by human-altered landscapes would reduce pollination services.

Ande O.T, Adetunji A. M, Akinpelu M. E, Senjobi B.A · Journals & Books Hosting (International Knowledge Sharing Platform) · Nigeria

Ibadan metropolis, Nigeria, home to about 6 million people, has raised growing concern over lowland soils in its periurban area, where much of the industrial waste transported by the River Ona is deposited; these soils are used for dry-season farming and contribute to food security. This study aimed to characterize periurban lowland soils around Ibadan and determine their vulnerability to industrial pollution, using a 50m x 50m grid with surface samples taken at 50m intervals, plus representative profile pits described using the USDA method, and particle-size and chemical analyses (phosphorus, nitrogen, exchangeable cations Ca/Mg/Na/K, manganese, and heavy metals including lead, copper, zinc, chromium, iron, and cadmium). Results showed the floodplain's surface soil was fertile, with high nitrogen (0.35 cmol/kg), phosphorus (51.25 cmol/kg), and potassium (0.61 cmol/kg), and phosphorus levels ranging from very high to toxic, between 28.99 and 87.70 ppm. Average heavy metal concentrations were lead 34.30 mg/kg, zinc 171.20 mg/kg, iron 83.97 mg/kg, copper 19.11 mg/kg, manganese 31.10 mg/kg, chromium 0.69 mg/kg, and cadmium 0.3 mg/kg. Predicted soil-to-plant heavy metal transfer coefficients (Pb 35-343; Cr 0.46-4.6; Zn 171-1712; Cu 19-191; Fe 83-840; Mn 31-281; Cd 0.1-10) indicated crops grown in the area could contain toxic levels of these metals; however, high yields and healthy plant condition observed in the field, together with farmer interviews, suggested that the high phosphorus level (28.99-87 ppm) may have inhibited uptake of some metals such as lead, zinc, and copper.

US Yannick, BL Louis, KL Antoine, AB Lukangila, MK Matthieu, KM Nathan, MKL Jerry, MM Mpundu, KL Nyembo · Journal of Applied Biosciences · Colombia

In Lubumbashi, Democratic Republic of the Congo, researchers analyzed the fertilizing value of different types of biowaste used in urban market gardening through principal component analysis of grower profiles, chi-square analysis of practices, and physico-chemical analysis of the waste materials. Most market gardeners were married women over 18 without land title; half the biowaste used was purchased chicken manure (with some pig manure), applied raw and buried in the soil, and while 33% of growers expected spreading it to increase productivity and improve soil physico-chemical properties, 48.3% expected it to improve vegetable growth appearance and boost yield.

Muhammad Bello Ibrahim, Nobaya Ahmad · Universiti Putra Malaysia Institutional Repository (Universiti Putra Malaysia) · Global

This review paper examines the concept and role of peri-urban agriculture (PUA) as a contributor to solving urban food crises in developing countries. It reviews the historical development and current state of PUA across different parts of the world in relation to rising urban vegetable demand, noting that agricultural communities engaged in PUA make multifunctional contributions to national economies. As approaches to PUA vary by country, the paper argues it is the community's role to identify the functions that benefit local people most, and discusses how PUA, through community and rural development, can boost urban food supply and serve as an income-generating option for farmers in developing countries.

C.F.A. van Wesenbeeck, Valentijn Venus, M.A. Keyzer, B. Wesselman, D. Asare Kye · · Africa

This study examined two tomato production areas in Burkina Faso with potential for counter-seasonal production aimed at Ghanaian urban markets, identifying the main obstacles to developing a horticultural supply chain: the monopsony power of Ghanaian traders and insufficient road quality causing high mechanical-damage losses in transport. Using a spatial-temporal simulation model to assess transport effects on tomato quality, the study found refrigerated transport is not a necessary condition for successful trade, since climate conditions alone do not severely harm quality, and concluded that regional diversification of exports offers Burkina Faso producers the best opportunities for improving their position in the chain, given the persistent trader monopsony and infrastructure constraints.

Yves Cabannes, Isabel María Raposo · City · Europe

This paper conducted a comparative analysis of peri-urban agriculture in Lisbon and London to assess its contribution to migrant social inclusion and urban biodiversity. The study found that social inclusion patterns are city-specific; for example, Cape Verdean urban farming communities in Lisbon strengthen community bonds but do not necessarily lead to better integration into wider Portuguese society. Migrant urban farmers contribute to broadening biodiversity, primarily in Lisbon and to a lesser extent in London.

Zakir Hussain, Markus Hanisch · Journal of Environmental Planning and Management · India

This paper describes the adaptation of agricultural management practices in the urban periphery of Hyderabad, India, due to structural changes. Based on 120 farmer interviews, the study found that increasing costs for agricultural inputs like labor and land motivated farmers to intensify water, machine, and chemical use, which created problematic environmental impacts. Farmers also adapted by resorting to part-time farming and organizing efforts to share family labor.

Sarah James · Geographical Research · Australia (Sydney)

This paper examined the failure of Sydney's 'green zones' farmland protection policies, which were abandoned due to protests. The failure was attributed to a lack of consultation with Sydney's diverse small-scale farmers, rather than a rejection of farmland protection itself. Farmer interviews suggested that a bottom-up policy-making approach would have been more successful in maintaining farming in peri-urban areas.

N E Etim, J J Dukiya · International Journal of Advanced Remote Sensing and GIS · Nigeria (Abuja)

A study in the Kuje area council of Abuja, Nigeria, used questionnaires and multi-temporal satellite images from 1975–2010 to assess urban encroachment on agricultural lands. It found that urban encroachment into agricultural lands is occurring at an alarming rate of 15.7 km² annually, resulting in a total loss of 509 km² of agricultural land to urbanization over 35 years.

R. van Veenhuizen, G. de Bruijne, Miriam Otoo · Documents & Reports (World Bank) · Global

This paper explores sustainable financing for urban agriculture, particularly as part of the sanitation value chain. Financing is considered from two perspectives: an adequate mix of public, private, and local finance to avoid external funding dependency, and the purpose of investment focusing on value chains in the sanitation and (peri)urban agricultural sectors. The emphasis is on exploring financing options for urban agriculture through the valorization of urban waste, aiming for clear beneficial impacts on the urban and peri-urban agricultural sector.

Hamid El Bilali, Siniša Berjan, Jasmina Simic, Aleksandra Despotović, Sabrija Čadro, M. Kulina · Journal of Central European Agriculture · Bosnia

This study investigated urban and peri-urban agriculture (UPA) in the Sarajevo region of Bosnia, focusing on its legal and regulatory framework, governance, and advisory services. Information was gathered through a literature review and semi-structured interviews with 30 urban gardeners, extension agents, and municipal officers. The analysis covered UPA references in agricultural policies, extension agent focus, and urban planning regulations, concluding that UPA development requires improvements in regulatory frameworks and multi-stakeholder governance.

Sheila Castillo, Curtis R. Winkle, Stephen Krauss, Amalia Turkewitz, Cristina L.M. Silva, Edie Heinemann · Journal of Agriculture Food Systems and Community Development · United States (Chicago)

This study identifies seven perceived barriers to urban and peri-urban agriculture in the greater Chicago metropolitan area through interviews with urban planners and farmers. All seven barriers involve unclear or agriculture-unfriendly regulations. Results suggest that urban and peri-urban farmers are commonly forced to operate within a legal limbo or petition for exceptions to current regulations.

Shazia Iram, Ayesha Zaman, Zaiba Iqbal, Rabia Shabbir · Polish Journal of Environmental Studies · Global

This study screened soil samples from peri-urban agricultural areas to investigate heavy metal contamination and identify heavy metal-tolerant fungi. Results showed that the majority of isolated fungi were resistant to lead (Pb) and chromium (Cr). Among the strains, Aspergillus niger was the most tolerant to Pb with an MIC of 600 mg/l, and Aspergillus flavus was the most tolerant to Cr with an MIC of 400 mg/l.

王冬灵, Genxu Wang, 车生泉 · 上海交通大学学报：农业科学版 · China (Shanghai)

This article discusses the feasibility and optimization design of Community Supported Agriculture (CSA) type urban agricultural tourism parks in China, using Chongming Happy Farm in Shanghai as an example. It analyzes issues to consider when developing such parks and explores design optimizations across five aspects: agricultural production systems, tourism systems, overall layout, functional spatial structure, and operation management. The study suggests that CSA-type urban agricultural tourism parks can optimize urban agricultural tourism development and expand suburban agricultural development paths.