Urban agriculture could provide 15% of food supply to Sydney,Australia, under expanded land use scenarios

Urban agriculture (UA) can be highly productive in terms of yield per unit area, however productivity is limited by available land and high input requirements. We determined how much of the food supply of Sydney, Australia, could be produced through UA by synthesising yield data from 13 UA gardens with information on labour and key material inputs and using spatial analyses to assess available land area. We modelled three scenarios with varying proportions of available land used for food production; 25 %, 50 % or 75 % of domestic yard space along with street verges and unused land (e.g. vacant lots). Around 15 % of Sydney’s total food supply, or its entire vegetable supply, could be produced through UA under the low range scenario, increasing to 34 % under the highest land use scenario. Under the low range scenario, all necessary irrigation water and organic soil amendments could be obtained from local waste streams, though these sources were insufficient to meet the needs of higher range scenarios. Available labour was a limiting factor in all scenarios, with the entire population being insufficient to meet labour needs required to maintain food production under efficiency and labour investment regimes typical of amateur urban gardeners. Establishing a professionalised UA workforce with greater labour efficiency would be required for managing the available land, however this scenario would likely require changes in public attitudes towards use of private land. These social issues, rather than physical limitations, may be the biggest factors preventing cities like Sydney from obtaining a non-trivial proportion of their food supply from UA.     

Agronomic considerations for urban agriculture in southern cities

Urban and peri-urban agriculture (UA) provide a significant contribution to the total food requirements of cities, especially in southern cities of the developing world. Increasing food production in UA is therefore a necessity for increasing the food security of the urban poor. Urban environments are inherently different from rural environments and these differences in environmental conditions are expected to impact differently on crop growth. This review describes agronomic issues that are unique to UA and identifies possible interventions to address them. The constraints that can significantly differ include temperature, air quality, solar radiation and climate. The growth-limiting and growth-reducing factors that affect actual production in UA include water availability, nutrient supply, soil degradation, pests and soil pollution. The interventions addressing these constraints require action at both field level, and municipal or regional levels. The food security of the urban poor will therefore require coordinated efforts and cooperation between the farmers who produce food and the planners and policy makers who manage the supporting systems such as markets, inputs and land registration.     

The challenges to urban agriculture in the Sydney basin and lower Blue Mountains region of Australia

The western edge of the Sydney basin in Australia has been one of the major sources of fruit and vegetables for the Sydney markets. A rapid expansion of urban development in this region has caused a significant reduction in the number of small farms and market gardens. Urban and peri-urban agriculture in the region also provides an important buffer between urban development and the neighbouring Greater Blue Mountains World Heritage Area. The decline in urban agriculture can be attributed to various causes including urban expansion and economies of scale. This paper presents an overview of a four-year project that explored options for supporting these vulnerable farming communities both in terms of the regulatory factors and economic and environmental sustainability. The role of agri-industries as landscape buffers to the neighbouring World Heritage Area was investigated in relation to resilience, communities of practice, and ecosystem services. The study developed tools, in conjunction with targeted representative landholders, that can assist in enhancing the economic and environmental resilience of these agri-industries. These tools included an integrated bio-system approach to waste using organic waste conversion, and the use of landscape function analysis to monitor across farms to help address erosion, loss of nutrients and inefficient water management.     

Peri-urban agriculture in Jabodetabek Metropolitan Area and its relationship with the urban socioeconomic system

Peri-urban agriculture (PUA) has been proposed as an important urban element to deal with the challenges of increasing poverty, food insecurity, and environmental degradation as particularly found in rapidly expanding cities of the developing world. However, farming in the peri-urban is under strong pressure from urbanization. The economic and social roles of farming need to be better understood in order to integrate peri-urban agriculture into urban planning. This study used multivariate techniques and Geographically Weighted Regression to analyze statistical data at a village and sub-district, to explore the varying relationships between agricultural activities and urban economic activities, urban poverty and informality, as well as food security. This method was applied in the Jabodetabek Metropolitan Area (JMA) with Indonesia’s capital Jakarta at its core, and it resulted in some important findings. First, PUA was more associated with the increasing low and middle class residential areas and the growing small-middle scale urban economic activities rather than development of tourism and larger traditional market facilities. Second, whereas PUA in the North of JMA was under pressure by the increasing poverty, in the Southeast of JMA it has expanded concurrently with increasing poverty. Third, PUA is strengthened by increasing informal activities in the peri-urban zone that offer alternative jobs and additional income for the farmers. Fourth, PUA in the surroundings of Jakarta as well as in the East and Northeast of JMA has contributed to increasing food affordability as well as strengthening food security policy. Based on these results, recommendations to maintain the PUA have been formulated to support its role for the peri-urban economy, reduce poverty, manage informality, and increase food security.     

Mapping spatial patterns of urban agriculture in Rome (Italy) using Google Earth and web-mapping services

Urban agriculture (UA) has been acknowledged for several positive effects such as access to fresh food, human activities moderation, agro-biodiversity and social and cultural relationships. In the city of Rome due to social and economic trends this kind of activity is spreading, but so far very few attempts have been addressed to inventorying the UA areas (e.g., community gardens, residential gardens, school gardens, illegal vegetable gardens, urban farms, etc.). Some mapping experiences have been carried out but all lack of a well-established methodology to be applied for a complete inventory. In this paper we propose a conceptual framework and methodology for mapping the UA in Rome through Earth Observation techniques by using the concepts of photointerpretation and the features of the most used web-mapping services. Google Earth has been used as a basic tool for visual interpretation and polygon digitalization, while other services have been used for the availability of additional features (e.g., the oblique view of Microsoft Bing Maps). The integration of the web-mapping services combined with ancillary data improved the UA site detection, allowing to define both the land use and the UA typologies. We argue that the integration of the web-mapping services for building urban agricultural land use datasets is cost-effective compared to processing commercial remote sensing images. The inventory can enable administrators to perform analysis about the interactions between agricultural activities and the urban environment, and to enact informed policies for green and vacant urban spaces management.     

Urban agriculture and sanitation services in Accra,Ghana: the overlooked contribution

While urban agriculture has long been valued for providing food security and nutrition within cities, it contributes to many other urban services that are seldom cited as rationales for protecting or even expanding urban food production. Articulating the actual and possible contributions of urban agriculture to municipal sanitation and health services is critical for sustaining these urban farms and their functions into the future. In the context of the low coverage and performance of wastewater treatment plants in Accra, Ghana, health risk reduction measures implemented on and off farm can substitute to a large extent for this absence of conventional wastewater treatment. We estimate that Accra generates approximately 80,000,000L of wastewater per day, of which urban vegetable farms alone use up to 11,250,000L. By mitigating the health risks for farmers and consumers associated with widespread wastewater irrigation, these urban farms have the potential to significantly contribute to the city's sanitation needs. This could allow partial outsourcing of public health services from treatment plants to the farm, where wastewater is considered an asset instead of a problem. Urban agriculture could also significantly support buffer zone management along streams and rivers, resulting in a reduction of solid waste dumping and environmental pollution, but most importantly an improvement in flood control and related public health challenges. While urban agriculture is not the panacea for addressing these urban challenges, it can significantly contribute to their solution.     

Taking context into account in urban agriculture governance: Case studies of Warsaw (Poland) and Ghent (Belgium)

This article explores the role of local particularism in relation to the global interest in urban agriculture (UA). A growing movement is advocating UA, but future prospects are limited by variability, unclear expectations, vague responsibilities and leadership in the UA movement. We wonder whether the poor understanding of UA governance is associated with a public discourse and academic literature that too easily adopt the generic and universally claimed benefits. We argue here that uncritical enthusiasm results in an overly instrumental approach to governance of UA with a main focus on stimulating formal (e.g., policy making) and informal advocacy (e.g., civic engagement in UA). We do not deny the importance of formal and informal advocacy in UA development, but rather claim that the potential of UA needs a more nuanced analysis. Study of the interplay between UA advocacy and a city’s contextual characteristics is a worthy pursuit, as it may provide significant and more profound explanations for the divergence observed in UA developments. Case studies performed in Warsaw (Poland) and Ghent (Belgium) serve to illustrate the importance of context. The results suggest that neither case is likely to benefit from a governance strategy that only stimulates greater advocacy and institutional support. The inclusion of city-specific needs, opportunities and pitfalls of UA in the governance strategy can help to move UA toward its full potential. We suggest a policy-making strategy for UA that expands beyond the realm of food production alone. Ultimately, the aim is to steer away from assessing (and critiquing) UA solely against the backdrop of these generic success factors.     

‘If I want safe food I have to grow it myself’: Patterns and motivations of urban agriculture in a small city in Vietnam’s northern borderlands

Urban agriculture literature regarding the Global South reveals important knowledge gaps concerning spatial variations of food gardens across cityscapes, gardener motivations, and tensions with urban planning regulations, especially in locales beyond sub-Saharan Africa. In Vietnam, urban agriculture is growing in popularity and gaining media attention but there is little research as to why urban agriculture is practiced in smaller Vietnamese cities, especially those close to rural hinterlands. In this paper we investigate small-scale urban agriculture – or food gardens – in Lào Cai, a small upland city located on the Sino-Vietnamese border. We find a complex diversity of garden sizes and land management arrangements where gardens are built, including on state institutional land, thanks to informal arrangements. Gardener motivations focus predominantly on food safety concerns, contrasting with key motivations found elsewhere in the Global South. Throughout the city, albeit more so in newly urbanising sectors, this urban practice remains precarious due to irregular land access and confusing city authority regulations. We thus examine how urban residents are working to access safe food and contribute to their city’s urban food system while state officials tend to focus their priorities elsewhere.     

The rise of the ‘food charter’: A mechanism to increase urban agriculture

Urban agriculture (UA) is rapidly growing in popularity and significance across the Western hemisphere. For over two decades North Americans have embraced the concept, although in Europe the idea of UA has only recently gained attention from academics, practitioners and policy makers. Networks are beginning to form in the UK, sometimes bound by a ‘food charter’: a statement of aims which bring together businesses, practitioners and other bodies involved or interested in sustainable food systems. More recently, food charters have become popular tools for pursuing the UA agenda. In this paper we provide a view on this method of moving forward the local food agenda; primarily using a case study of Birmingham, we comment on its success and potential for the future.     

Agricultural Sustainability and Open-Field Farming in England,c.1650–1830

Recent debates about modern farming have come to be couched in the terminology of sustainable agriculture, a concept originally developed in respect of international post-World War Two farming, and especially in developing countries. In this paper we ask whether there is a historical dimension to the sustainability question and, in particular, whether by recasting the approach to the long-term development of agriculture it is possible to develop a new view of the manner in which farming has changed through time. We look at open-field farming where it dominated the agriculture of 17th and 18th century England. We show how collective community action had developed over many centuries to protect scarce land resources, and how pressures upon these resources through changing economic and demographic conditions inspired communities to develop and promote sustainable methods of husbandry and management. We demonstrate this world of sustainability through its maintenance of the ecological integrity of the land resource, the economic climate in which it operated, and the equitable ownership and decision-making processes that kept it in place. We also show that eventually the ecological integrity was put under mounting economic pressure arising from demographic forces, and also the external pressures arising from war. In particular we show how such pressures compromised the equitable ownership and access to land resources.     

Safe food,green food,good food: Chinese Community Supported Agriculture and the rising middle class

The growth of China's middle class is driving an expansion of interest in ‘green’ and sustainable food, food that is perceived to be healthy, safe and environmentally friendly. Self-consciously ‘sustainable’ agriculture is a new phenomenon in China, but it has emerged from, and builds upon, an agrarian history that is markedly different from that of the West. In this paper, we address the relationship between the Chinese middle class, an overwhelmingly urban group, and Chinese sustainable agriculture, a largely urban-oriented enterprise, from the perspective of our work in establishing and operating Beijing's first Community Supported Agriculture (CSA) farm. We discuss the farm's environmental and institutional sustainability, situating its development within the larger context of contemporary Chinese agriculture, and we examine the potential for future success with CSA models in China based on evidence from this case.     

Multifunctional peri-urban agriculture—A review of societal demands and the provision of goods and services by farming

Peri-urban areas around urban agglomerations in Europe and elsewhere have been subject to agricultural and land use research for the past three decades. The manner in which farming responds to urban pressures, socio-economic changes and development opportunities has been the main focus of examination, with urban demand for rural goods and services representing a driving factor to adapt farming activities in a multifunctional way. Working within the peri-urban framework, this review pays particular attention to the relevance of multifunctional agriculture. Academic discourses and empirical insights related to farm structure and practices beyond conventional agriculture are analysed. Diversification, recreational and environmental farming, landscape management and specialisation, as well as direct marketing are all taken into consideration and discussed within the context of landscape functions. The provision of rural goods and services is contrasted with societal demands on peri-urban agriculture. This review finds that multifunctional agriculture has been commonly recognised in peri-urban areas – a phenomenon that includes a large variety of activities and diversification approaches within the context of environmental, social and economic functions of agriculture. In response to the post-productive, consumption-oriented requirements of the urban society, peri-urban farmers have intensified their uptake of multifunctional activities. Nevertheless, not all multifunctional opportunities are being fully developed when one considers the large and growing urban demand for goods and services provided by agriculture carried out near the city. This paper discusses policy and planning approaches to support multifunctional agriculture in peri-urban areas.     

Does indigenous and campesino traditional agriculture have anything to contribute to food sovereignty in Latin America? Evidence from Chile,Peru, Ecuador,Colombia, Guatemala and Mexico

The current challenge for world agriculture is to provide food for a growing population, within a context of environmental degradation and economic inequality. The challenge is how to produce accessible, healthy, diverse, nutritious, safe and abundant food in a way that is sustainable, allowing farmers to exert food sovereignty while at the same time addressing ecosystem conservation. The aim of this study is to explore the potential contribution of traditional agriculture to food sovereignty and also to understand the challenges that indigenous communities are facing today. Our case studies are from six Latin-American countries: Chile, Peru, Ecuador, Colombia, Guatemala and Mexico, where we carried out semi-structured, guided visits and field observations. Our results shed light on how traditional agricultural knowledge, techniques and practices can contribute to these issues, but also to the need of protecting and recovering the cultural and ecological heritage. There is a need to resolve public management issues, related to development investment, technological packages, cultural loss and gender. If these are not addressed, the potential contribution of ancient agricultural knowledge will fail to contribute to strengthen food sovereignty and maintain the local markets, which are also places for seed exchange, knowledge sharing and social networking.     

Putting the culture back into agriculture: civic engagement,community and the celebration of local food

This paper reports on the case study of a community-supported agriculture (CSA) farm in south-western Ontario, Canada. As an exemplar of urban agriculture, Fourfold Farm CSA operates from an alternative agriculture paradigm and is built upon the socio-ecological practices of civic engagement, community and the celebration of local food. Analysis of in-depth, key informant interviews with members of the CSA as well as the co-founders reveals the extent to which the farm is much more than a source of healthy, organic food. The paper outlines the ways the CSA operators and their members articulate a deeper endeavour to link urban food consumers with food producers through cultural activities. The discussion concludes with a call for more social research in agriculture as well as a broader effort to articulate the ways urban agriculture can contribute to putting the culture back into agriculture and creating sustainable systems of farming.     

Sustainable urban agriculture: stocktake and opportunities

This paper reviews research on urban agriculture which relates to the three dimensions of sustainability: social, economic and environmental. We propose that urban agriculture has three elements: urban agriculture in isolation; its interface with the people and environment within which it is situated; and its contribution to the design of built form. Additionally, we consider its scale: micro, meso and macro. The analysis draws attention to legal, social and economic constraints and opportunities. It suggests that future priorities for research should be directed towards (i) strategically identifying principles of sustainable urban agriculture that help policy makers to design resilient cities, e.g. using flood-prone areas for food and employment, and (ii) operationally trialling innovative institutional mechanisms, e.g. differential land taxes to support sustainable urban agriculture or payments for environmental services provided by urban agriculture such as carbon sequestration.     

Population-dynamics focussed rapid rural mapping and characterisation of the peri-urban interface of Kampala, Uganda

In developing countries, cities are rapidly expanding and urban and peri-urban agriculture (UPA) has an important role in feeding these growing urban populations; however such agriculture also carries public health risks such as zoonotic disease transmission. It is important to assess the role of UPA in food security and public health risks to make evidence-based decisions on policies. Describing and mapping the peri-urban interface (PUI) are the essential first steps for such an assessment. Kampala, the capital city of Uganda is a rapidly expanding city where the PUI has not previously been mapped or properly described. In this paper we provide a spatial representation of the entire PUI of Kampala economic zone and determine the socio-economic factors related with peri-urbanicity using a population-dynamics focussed rapid rural mapping. This fills a technical gap of rapid rural mapping and offers a simple and rapid methodology for describing the PUI which can be applied in any city in developing countries for wide range of studies.     

传统农业时代乡村粮食安全水平估测

传统农业时代中国单位面积的粮食产量长期在世界处于领先地位,农业技术水平的提高在很大程度上降低了饥荒风险,减缓了饥荒的发生。隋唐以前粮食生产能力处于持续上涨阶段,粮食生产能力完全能够应对可能发生的饥荒,而且还可以供养更多的人口。宋元明时期粮食生产能力依然高于秦汉时期的水平。入清以后由于人口增殖过快,人口压力剧增,粮食供应空前紧张。清代中国人均粮食占有量倒退到2000多年前春秋战国时代的水平上,饥荒的频繁发生已经呈现出不可避免的恶化趋势。因此提高粮食产量水平成为20世纪中国最为关键的问题,在耕地资源基本开发殆尽的情况下,唯有采取改进农业技术提高单位面积产量的办法最为可行。战争和自然灾害是导致粮食波动的根本性因素,局部地区因此而出现粮食短缺,饥荒的发生成为可能。农民是粮食生产的主体力量,同时也是最易遭受饥荒危害的社会群体。中国传统社会农民生活水平长期处于贫困化的状态,直至20世纪中叶依然没有发生根本性变化。     

Green Agriculture: foundations for biodiverse,resilient and productive agricultural systems

There are many visions on how to achieve a sustainable agriculture that provides enough food and ecosystem services for present and future generations in an era of climate change, increasing costs of energy, social unrest, financial instability and increasing environmental degradation. New agricultural systems that are able to confront the challenges of a rapidly changing world require a minimum of ten attributes that constitute the defining elements of a Green Agriculture. A major challenge is to identify a set of thresholds that any agricultural production strategy must meet, beyond which unsustainable trends caused by the farming technologies would lead to tipping-point phenomena. Only those styles of agriculture that meet the established threshold criteria while advancing rural communities towards food, energy and technological sovereignty would be considered viable forms of Green Agriculture. Considering the diversity of ecological, socio-economic, historical and political contexts in which agricultural systems have developed and are evolving in, it is only wise to define a set of flexible and locally adaptable principles and boundaries of sustainability and resiliency for the agroecosystems of the immediate future.     

Trees,agroforestry and multifunctional agriculture in Cameroon

Modern agriculture has deprived local communities in the tropics of their natural life-support system—the forest resource and the traditional knowledge about indigenous species—and this has not been replaced by employment opportunities or social services. This project in the west and northwest regions of Cameroon takes an innovative three-step approach to improving the lives of local people by establishing rural resource centres (RRCs) to: (i) Rehabilitate degraded land and promote food security through the use of nitrogen-fixing trees to restore crop yields and then the diversification of the farming system with new crops; (ii) Create income generation opportunities from village tree nurseries and the domestication of indigenous fruits and nuts for local and regional trade. Income is rising annually and currently averages $150, $16,000 and $21,000 per RRC after 2, 5 and 10 years, respectively; (iii) Encourage the processing and marketing of food crops and tree products in order to create employment and entrepreneurial opportunities for community members. Income is currently $2400 per enterprise. The project's philosophy is one of helping smallholder farming communities to help themselves: first to become self-sufficient and economically independent, and then to be a hub for the dissemination of knowledge and skills to neighbouring communities.     

Urbanisation and Food Insecurity Risks: Assessing the Role of Human Development

The phenomenon of rapid urbanisation across the world has become a topic of increased scholarly inquiry. Yet, little attention has been paid to how urban growth affects countries’ food security and whether this association is modified by a country's level of development. The present study aims to fill this lacuna by examining the association between urbanisation and food security applying statistical modelling. The analysis uses country-level data, from the World Development Indicators and the United Nations’ World Urbanization Prospects. Using a Food Insecurity Risk Index (FIRI) as the outcome variable, the results confirm a significant negative impact of urban growth on food security at the country level. It further finds that rapidly urbanising countries with the lowest levels of human development are most at risk of food insecurity.