The Socio-Cultural Benefits of Urban Agriculture: A Review of the Literature

Tomato Urban Gardening Supported by an IoT-Based System: A Latin American Experience Report on Technology Adoption

When urban agriculture is addressed at a family scale, known as urban gardening, it is assumed as a non-commercial activity where some family members voluntarily take care of the plantation during their free time. If technology is going to be used to support such a process, then the solutions should consider the particularities of these gardeners (e.g., life dynamics and culture) to make them adoptable. The literature reports several urban agriculture experiences in Western countries and Southeast Asia; however, this activity has been poorly explored in South American countries, particularly at a family scale and considering the culture and the affordability of the solutions. This article presents an experience report of urban gardening in Peru, where a prototype of an IoT system and a mobile application were conceived, implemented, and used to support the gardening of vegetables at a family scale, considering the cultural aspects of the gardeners. This experience obtained positive results in terms of tomato production, mainly showing the system's capability to self-adapt its behavior to consider the cultivation conditions of these urban gardeners. To the best of our knowledge, this is the first IoT system that can be iteratively adjust its behavior to improve the chances of being adopted by a particular end-user population (i.e., gardeners).

Exploring the potential of plant astrobiology: adapting flora for extra-terrestrial habitats: a review

In recent years, the realm of astrobiology has expanded beyond the search for microbial life to encompass the intriguing possibility of plant life beyond our planet. Plant astrobiology delves into the adaptations and mechanisms that might allow Earth's flora to flourish in the harsh conditions of outer space and other celestial bodies. This review aims to shed light on the captivating field of plant astrobiology, its implications, and the challenges and opportunities it presents. Plant astrobiology marries the disciplines of botany and astrobiology, challenging us to envision the growth of plants beyond Earth's atmosphere. Researchers in this field are not only exploring the potential for plant life on other planets and moons but also investigating how plants could be harnessed to sustain life during extended space missions. The review discusses how plants could adapt to environments characterized by low gravity, high radiation, extreme temperature fluctuations, and different atmospheric compositions. It highlights the physiological changes necessary for plants to survive and reproduce in these conditions. A pivotal concept is the integration of plants into closed-loop life support systems, where plants would play a crucial role in recycling waste products, generating oxygen, and producing food. The review delves into ongoing research involving genetic modifications and synthetic biology techniques to enhance plants' resilience in space environments. It addresses ethical considerations associated with altering organisms for off-planet habitation. Additionally, the review contemplates the psychological and emotional benefits of having greenery in enclosed, isolated space habitats. The review concludes that by employing advanced research methodologies, the field of plant astrobiology can greatly enhance the viability and sustainability of future space missions, highlighting the essential role of plants in sustaining long-term human presence beyond Earth.

Unveiling human-nature interaction: Qualitative exploration of perceived benefits of urban gardening

The study seeks to provide insights into the subjective experiences and perceived benefits of urban gardening by gardeners in the city of Belgrade. It encompassed several forms of urban gardens, both collective and individual. The study involved conducting semi-structured interviews with 44 gardeners, supplemented by field observations. Thematic analysis revealed seven key themes of benefits. The findings slightly diverged from studies in developed countries, demonstrating less emphasis on the social aspects of urban gardening, as participants did not view social interaction as a primary motivation. Also, there was a stronger focus on the productive and economic aspects of gardening among the retired low-income population of home gardeners with previous experience in agriculture.

Assessing economic sustainability and resilience of tomato farming ventures in Addis Ababa: A project-based evaluation

This study assessed the economic sustainability and contribution of tomato farming ventures to Addis Ababa's resilience. Using a project-based evaluation method, the profitability of tomato production was analyzed with and without the cost of water. The results showed that including the cost of water, the venture had a negative net present value (NPV) of 30100 USD/hectare/annum, an internal rate of return (IRR) of 0.2%, a payback period (PBP) of over ten years, and a cost-benefit ratio (CBR) of 0.83. However, without the cost of water, the venture showed a subtle profit, with an NPV of 15100 USD/hectare/annum, an IRR of 21%, a PBP of 2.9 years, and a CBR of 1.02. Sensitivity analysis revealed that an increase in sales price and yield positively affected profitability, while an increase in operating cost had a negative effect. The study concluded that when water costs are considered, the tomato venture in Addis Ababa is not profitable or sustainable, and does not contribute to the city's resilience. However, without water cost accounting, the venture's contribution to the city's resilience is minimal. The study recommends policy interventions to enhance farmers' access to the market, establish agro-industries, and improve their bargaining power.

Prediction of perfluoroalkyl acids (PFAAs) in homegrown eggs: Insights into abiotic and biotic factors affecting bioavailability and derivation of potential remediation measures

Homegrown eggs from free-ranging laying hens often contain elevated concentrations of perfluoroalkyl acids (PFAAs). However, it is unclear which factors contribute to these relatively large exposure risk scenarios. Moreover, existing bioavailability and modeling concepts of conventional organic pollutants cannot be generalized to PFAAs due to their different physicochemical soil interactions. Therefore, there is an urgent need for empirical models, based on real-world data, to provide insights into how (a)biotic factors affect the bioavailability to eggs. To this end, 17 targeted analytes were analyzed in abiotic (i.e. rainwater, soil; both N = 101) matrices and homegrown eggs (N = 101), which were sampled in 101 private gardens across Flanders (Belgium) in 2019, 2021 and 2022. Various soil characteristics were measured to evaluate their role in affecting PFAA bioavailability to the eggs. Finally, PFAAs were measured in potential feed sources (i.e. homegrown vegetable and earthworm pools; respectively N = 49 and N = 34) of the laying hens to evaluate their contribution to the egg burden. Modeling suggested that soil was a major exposure source to laying hens, accounting for 16-55% of the total variation in egg concentrations for dominant PFAAs. Moreover, concentrations in vegetables and earthworms for PFBA and PFOS, respectively, were significantly positively related with corresponding egg concentrations. Predictive models based on soil concentrations, total organic carbon (TOC), pH, clay content and exchangeable cations were successfully developed for major PFAAs, providing possibilities for time- and cost-effective risk assessment of PFAAs in homegrown eggs. Among other soil characteristics, TOC and clay content were related with lower and higher egg concentrations for most PFAAs, respectively. This suggests that bioavailability of PFAAs to the eggs is driven by complex physicochemical interactions of PFAAs with TOC and clay. Finally, remediation measures were formulated that are readily applicable to lower PFAA exposure via homegrown eggs.

From multiple streams to a torrent: A case study of food policymaking and innovations in New York during the COVID-19 emergency

The COVID-19 pandemic has had significant effects on urban and regional food systems. Local administrations worldwide have been challenged to design and implement policies to mitigate immediate food system disruptions while planning for longer-term equity and resilience. The fast pace and high degree of uncertainty of the pandemic have made systematic tracking and assessment of food system change and related policy responses arduous. To address this gap, this paper applies the multilevel perspective on sociotechnical transitions and the multiple streams framework on policy change to 16 months of food policy (March 2020 through June 2021) during the New York State-issued COVID-19 state of emergency, comprising more than 300 food policies advanced by New York City and State legislators and administrators. Content analysis of these policies revealed the most salient policy areas during this period, the status of legislation, and key programs and budget allocations, as well as local food governance and the organizational spaces within which food policy operates. The paper shows that food policy domains that gained prominence focused on support for food businesses and food workers and on ensuring and expanding food access through food security and nutrition policies. Most COVID-19 food policies were incremental and were limited to the duration of the emergency, yet the crisis allowed for enactment of novel policies that deviated from the common policy issues or the typical scale of changes proposed pre-pandemic. Taken together, and viewed through a multilevel and policy streams framework, the findings provide insight into the trajectory of food policymaking in New York during the pandemic and the areas that food justice activists, researchers, and policy makers should focus on as the COVID-19 pandemic is abated.

Food production and resource use of urban farms and gardens: a five-country study

There is a lack of data on resources used and food produced at urban farms. This hampers attempts to quantify the environmental impacts of urban agriculture or craft policies for sustainable food production in cities. To address this gap, we used a citizen science approach to collect data from 72 urban agriculture sites, representing three types of spaces (urban farms, collective gardens, individual gardens), in five countries (France, Germany, Poland, United Kingdom, and United States). We answered three key questions about urban agriculture with this unprecedented dataset: (1) What are its land, water, nutrient, and energy demands? (2) How productive is it relative to conventional agriculture and across types of farms? and (3) What are its contributions to local biodiversity? We found that participant farms used dozens of inputs, most of which were organic (e.g., manure for fertilizers). Farms required on average 71.6 L of irrigation water, 5.5 L of compost, and 0.53 m² of land per kilogram of harvested food. Irrigation was lower in individual gardens and higher in sites using drip irrigation. While extremely variable, yields at well-managed urban farms can exceed those of conventional counterparts. Although farm type did not predict yield, our cluster analysis demonstrated that individually managed leisure gardens had lower yields than other farms and gardens. Farms in our sample contributed significantly to local biodiversity, with an average of 20 different crops per farm not including ornamental plants. Aside from clarifying important trends in resource use at urban farms using a robust and open dataset, this study also raises numerous questions about how crop selection and growing practices influence the environmental impacts of growing food in cities. We conclude with a research agenda to tackle these and other pressing questions on resource use at urban farms.

SUPPLEMENTARY INFORMATION

The online version contains supplementary material available at 10.1007/s13593-022-00859-4.

Transforming the Use of Agricultural Premises under Urbanization Pressures: A Story from a Second-Tier Post-Socialist City

Diverse aspects of de-agrarianization, which is manifested by the cessation or significant reduction in agricultural activities, have been clearly visible at the outskirts of large cities in Central Europe in recent decades. The key drivers behind this process include increased pressures to cover peri-urban agricultural land by new developments, inadequate protection of agricultural land, ineffective implementation of urban planning policies, low recognition of the importance of agriculture, and overall changes in people’s dietary habits. Urbanization pressures undoubtedly belong to the factors intensifying overall de-agrarianization, as urban farmers are usually not able to compete with other urban functions. This article focuses on more in-depth understanding of the driving forces behind de-agrarianization processes that are specific to post-socialist cities. As a case study, Brno, a second-tier city in the Czech Republic, was selected. In the first part, the conceptual framework and drivers of de-agrarianization are discussed specifically for the case of large Central European post-socialist cities. In the next part, we explore by means of a set of qualitative interviews the case study of the regeneration of the area of a former Cistercian monastery in Brno that was traditionally used for agricultural purposes, but recently was redeveloped for a university campus. Our findings signal procedural issues connected to the preservation of architectural heritage during the regeneration that frequently end up with only fragments being preserved. We also demonstrate a decline in the use of urban agricultural properties that are hastily transformed into a new urban environment under extremely strong urbanization pressures. We argue that even in economically prosperous cities with highly neoliberal competition between possible urban land uses, agriculture must be considered a relevant and highly important urban function and more protected by planning tools.