Vertical Farming in Singapore: Opportunities and Challenges

Introduction

According to research trends on human population, in the near future approximately 80% of the world's population will move to urban areas in search of employment opportunities. This means a large proportion of humanity will reside in urban centers seeking livelihoods. Human population is increasing at an alarming rate, stressing the scarce resources available for human development. Scientific projections estimate that by 2050 the world's population will have grown by approximately 3 billion individuals, requiring extra resources to facilitate the existence and development of this population. There will consequently be a need for additional land to provide food for an overwhelming future population (Kvaloy & Tveteras 2008, pp. 296–311).

The current world population already exerts enormous pressure on available land. This pressure arises from the need for land to accommodate buildings and other structures required for human security and development. It is crucial to ensure the food security of the human race in order to maintain balance within natural settings. Current, traditional farming practices require large areas of land to be executed effectively. According to research by the FAO and NASA, over three-quarters of the world's agriculturally viable land is already in use. With population growing at an alarming rate, it would be dangerous to continue relying solely on available land and traditional farming practices. Singapore, as part of the global community, is not immune to this looming danger. Singapore needs to adopt vital and reliable farming practices to help facilitate the development of future generations. This calls for farming methods that operate on available resources. This research examines the need to adopt vertical farming in Singapore in order to maximize the productive use of scarce resources. The research draws on case studies, questionnaires, and interviews with relevant sources to understand the opportunities and challenges of applying vertical farming in Singapore (Ehrenberg 2008, p. 16).

Singapore is already developing a vertical farming system prototype designed to enable the land-scarce country to maximize the production of leafy vegetables. Vertical farming is the application of techniques that enable agricultural production at multiple levels while preserving available land space. One prototype involves erecting a six-meter tall structure capable of rotating at one millimeter per second in order to distribute sunlight evenly to all plants. The system is powered by recycled water, thereby minimizing energy consumption. This new technological development in farming is affordable, allowing the country to limit expenditure on agricultural practices. The vertical system is significant for both the current and future population in many respects, making it crucial to determine the opportunities and challenges that may arise with its adoption (Wagner 2010, pp. 68–69).

Vertical farming would enable the current and future population to relieve overwhelming pressure on land. Since most individuals are moving to urban areas for employment, there are minimal land resources available in rural areas. The land in rural areas that serves as the main channel of food supply to cities is already under exploitation due to the growing population. There will be less land to support the world's growing population. It is therefore necessary for countries such as Singapore to adopt vertical farming to help solve this pressure on scarce land. Vertical farming provides the opportunity to exploit available space through the use of vertical height. Large-scale production of leafy vegetables and other horticultural products can maximize agricultural output and support food security in urban areas. Vertical farming is also an affordable practice, allowing resources otherwise spent on agriculture to be diverted to other areas of development. It is essential to adopt cheaper farming practices to address the reality of scarce resources and rapid population growth (Fischetti 2008, p. 74).

Vertical farming is more productive than traditional farming practices because it is subject to minimal weather-related crop failure. Weather-related failures can arise because of droughts, floods, and pest invasions — calamities that are minimized in vertical farming. This represents one of the most important opportunities for applying vertical farming in Singapore. Vertical farming also aids in the conservation of land structure and reduces fossil fuel use. It is cheaper because herbicides and pesticides are minimally required, as the technology is mainly organic in nature. Through recycling of the water system, vertical farming eliminates agricultural runoff. One of the challenges of vertical farming, however, is the constraint of fitting structures between buildings in an urban setting. It is easier to implement in rural scenarios where there is no limitation on the land required for erecting the structure. Obtaining sufficient water to operate the system is also difficult, and creativity of design within urban settings poses additional challenges. The shadow effect of surrounding buildings can further limit plant development within the structure (Ehrenberg 2008, p. 16).

Food production in Singapore has faced many environmental and demographic constraints. The population is rapidly increasing, and the food currently produced may not, in a few years, be sufficient to feed the expanding population (Waller 2001, p. 14). Given that Singapore is a relatively small nation, a large portion of land that could have been used for farming is occupied by the commercial and residential structures developed for settlement (Hopkins & Goodwin 2011, p. 44). This encroachment is steadily making it more difficult for the nation to produce its own food, resulting in Singapore's current heavy dependence on imported food. Vertical farming has therefore emerged as a long-term solution to this problem (Miller & Spoolman 2012, p. 310).

Singapore's relatively small land area makes horizontal farming difficult, and vertical farming presents a viable solution (Hopkins & Goodwin 2011, p. 228). For example, food that could have been produced from 10,000 m² can potentially be produced in a vertical ten-level structure with a floor area of only 1,000 m². Prototypes are already under testing, and with every part of the building exposed to sufficient sunlight for the necessary period, crops — mainly vegetables — thrive remarkably well in a controlled environment. The result is an even higher quantity of food than would have been produced on natural land (Venter 2010, p. 105). This shows that Singapore is moving in the right direction in its bid to achieve self-sufficiency in food production and could serve as an example for the rest of the world.

The adoption of vertical farming in Singapore could also improve the utility of the limited land available (Miller & Spoolman 2012, p. 310). While crops are cultivated on vertical structures, land that would otherwise be used for cultivation could be repurposed for other lucrative activities such as the construction of key industries or the development of infrastructure. Such investment and planning could help acquire funds for further advancement of vertical farming techniques.

Vertical farming is also safer than conventional farming in several respects. The enclosed nature of the farming units considerably reduces disease incidence. Weather problems such as floods and drought are effectively ruled out (Venter 2010, p. 105). Crop production can also be carried out all year round within a controlled environment (Hopkins & Goodwin 2011, p. 228), significantly increasing the quantity of food produced by eliminating seasonal constraints. These advantages all contribute to the goal of producing enough food for an expanding population.

In increasing production, vertical farming also serves to restore balance in the natural ecosystem. It utilizes a system in which water is constantly recycled (Venter 2010, p. 106), thereby avoiding loss through runoff. The use of petroleum fuels is also significantly reduced — for example, through the elimination of tractors (Venter 2010, p. 106). Pollution from fossil fuels is therefore reduced, leading to cleaner air and protection of the ozone layer. Vertical farming also creates numerous employment opportunities for the growing population.

The concept of vertical farming is still in its early stages of development and has not been fully embraced even in developed nations (Iyyer 2009, p. 49). It is likely to face various constraints in full implementation. One constraint arises from the potential for farming units to produce significantly more per unit area than ordinary farms, which could lead to unfair competition and push small-scale farmers out of the market (Iyyer 2009, p. 49).

Secondly, vertical farms are capital-intensive investments that require large amounts of funding to establish (Iyyer 2009, p. 50). This makes them expensive and out of reach for many governments, reducing their effectiveness as a widespread solution to sustainable food production. Singapore, however, has the financial capacity to establish such farms and thereby propel the nation toward better food security.

Background and Literature Review

The last key constraint is that these farms are particularly complex, and their establishment depends heavily on collaboration among corporate entities, governments, and universities (Hopkins & Goodwin 2011, p. 228). Highly experienced professionals are required in their design and development, and substantial research funding is needed since the concept remains in early stages. Corporate entities need to embrace vertical farming as part of their corporate social responsibility, while governments must provide the necessary funding, since the financial requirements often exceed what corporate entities alone can afford (Waller 2001, p. 14).

Feeding the world is increasingly becoming a challenge. Smil, the author of Feeding the World: A Challenge for the Twenty-First Century, describes vertical farming as an alternative form of farming in which producers live in towns and use skyscrapers to grow their food (Smil 2001, p. 30). He paints an image of a modernized world that embraces changes in response to rising food demand. In Singapore, key stakeholders are working to integrate food production resources to develop this form of vertical farming.

Farming consumes space, resources, and energy. While resources and energy may be more readily available, population growth reduces available space as human habitation expands. Economists and agricultural experts estimate that by 2050 around 80% of Singapore's population will be living in urban settlements, calling for an adjustment to many parameters of human existence — with food at the top of the list (Smil 2001, p. 30). These urban residents will need to eat every day and will prefer access to their customary diet.

Vertical farming will reduce resource consumption through the centralization of production and the reduction of transport costs. According to Venter in Successful Hydroponics, vertical farming reduces the number of intermediaries between producers and consumers (Venter 2010, p. 107), which lowers transport costs and frees resources for other sectors of the economy.

Urban vertical farming is also an environmentally friendly method. Farmers can use wastewater from buildings that would otherwise flow into sewers, where it causes pollution and disease after mixing with harmful bacteria. Vertical farming thus presents a long-term solution to drainage systems in many cities. Reusing wastewater reduces both water consumption and the toxic waste the water might carry. Natural forests and trees help keep environments clean, and farming land threatens how long these natural forests will last. Singaporeans take exceptional pride in their vegetation, which further motivates the development of vertical farming to protect it. Clearing natural vegetation for cultivation always poses an environmental risk and reduces the natural beauty of the land (Venter 2010, p. 107).

Keeler and Burke, in Fundamentals of Integrated Design for Sustainable Building, devote part of their work to vertical farming (Keeler & Burke 2009, p. 301). According to these authors, vertical farming settings allow farmers to provide the conditions required for plant growth, such as lighting and temperature regulation. In a vertical growing building, farmers can grow crops in a greenhouse environment using electricity to selectively influence plant development by adjusting lighting and temperature. The authors further note the minimized use of fossil fuels, since vertical farming does not require tractors or other heavy machinery.

Iyyer focuses on land management through vertical farming. Different crops require different growth conditions, and Iyyer observes the possibility of separating plants according to their differing requirements (Iyyer 2009, p. 50). This selective growing approach is especially valuable in treating crops against different pests and diseases. Since crops are kept in an indoor setting, environmental pests and diseases cannot affect them. When all plants are in separate, secluded growing areas, agricultural diseases caused by cross-species contact are reduced.

Vertical farming also carries a year-round growth advantage, since climatic conditions inside the growing structures depend on human application rather than natural weather patterns. Tracey, writing on urban agriculture and the new food revolution, highlights that conditions inside growing skyscrapers will be determined by human input (Tracey 2011, p. 230). This is a key step in ensuring food security, as year-round production will allow Singapore to feed its population and store food for future use.

Farmers willing to start vertical farming in Singapore face several discouraging challenges, despite the method's efficiency. The most common challenge is the initial capital required. Farmers need support from the government or other organizations as a stepping-stone (Killewo & Quah 2010, p. 164). The high start-up costs for materials can deter prospective farmers or delay the establishment of the farming operation.

Another challenge is uncertainty over farm lease renewal. Farmers may spend heavily on setting up vertical farming but fear whether their lease will be renewed at the end of the initial farming period (Sundaram & Nangia 2010, p. 169). In Singapore, land leases are typically granted for a duration of twenty years. Living with uncertainty about renewal discourages farmers and acts as an immense challenge (Huang & McBeath 2009, p. 243). An assurance of lease renewal would give farmers the confidence to commit to the investment.

Food security is one of the most pressing agendas requiring attention from Singapore's state officials. Most agricultural industries need to conduct research on methods that will boost food production to ensure food security. This effort is better pursued through collective industry collaboration rather than individual company research centers, which lowers costs. Food security cannot be taken lightly, given the degree of climate change and the challenge of identifying appropriate growing seasons in Singapore (Killewo & Quah 2010, p. 164).

Food prices in Singapore have been gradually increasing for several years alongside increased demand. This threatens the economy whenever harvests fall short. The government must ensure that food supply is flexible enough to meet current population demand, and food security must therefore be a primary state concern (Mitchell & Coles 2011, p. 163). The government needs to be supportive of farmers willing to practice methods such as vertical farming, particularly given the increasing rate of urbanization.

Singapore cannot sustainably rely on food imports to supply its growing population as food prices rise. Inflation in food prices would mean some individuals could no longer afford adequate meals. The government must therefore invest more effort in food production methods to address the current crisis (Sundaram & Nangia 2010, p. 169). When the cost of importation exceeds the cost of running a domestic vertical farming operation, Singapore has no alternative but to support farmers who wish to adopt vertical farming (Hopkins & Goodwin 2011, p. 221).

As a highly urbanized and food-import dependent country, Singapore faces significant opportunities and challenges. Local production currently provides only about 23% of hen eggs, 4% of the fish supply, and 7% of leafy vegetables. Aquaculture genomics research and development offers a promising pathway to meet Singapore's continued supply of food fish. Seafood is of high value in Singaporeans' diet, with marginal yearly per capita consumption exceeding 15 kg, of which more than 95% originates from abroad. To limit dependence on international markets and improve food safety, boosting the share of domestic seafood production to approximately 5% of total consumption within five to seven years is considered fundamental. The depletion of wild fish stocks must also be considered for its substantial impact on the price and supply of seafood in Singapore.

The Agri-Food and Veterinary Authority of Singapore (AVA) and the Temasek Life Sciences Laboratory (TLL) have set up a collaborative aquaculture project with the primary objective of increasing local seafood production by improving aquaculture of two key food fish species: Mozambique tilapia (Oreochromis mossambicus) and Asian seabass (Lates calcarifer). Modern molecular methods and advanced brood-stock development tools will enable faster generation of disease-resistant, fast-growing fish. This project gives Singapore a potential head start of four to five years in selective breeding of Asian seabass over other producing countries.

Singapore also faces a health challenge: adults aged 18 to 69 are prone to four major disease burdens, including diabetes (8.2%), hypertension (24.9%), obesity, and high cholesterol (18.7%). Unhealthy diet is a significant contributing factor. Functional foods — those providing health benefits beyond essential nutrition — are seen as a key tool in alleviating these burdens and reducing the risk of chronic illness. Singapore's functional food market has been growing at 8–20% annually, compared to 1–4% for the overall food industry, with the total functional food market projected to reach US$90.5 billion by 2013.

However, Singapore's functional food market faces the challenge of being dominated by products with mixed bioactive ingredients — such as minerals and vitamins — that lack technological innovation or proprietary protection. This may result in market products that vary widely in quality and in the scientific understanding of bioactive compound interactions, including food matrices that lack established effectiveness for health claim substantiation. Singapore's developing technologies aim to lead in the production of the next generation of functional foods, which could reduce chronic disease risk factors considerably and provide a remarkable opportunity to Singapore's food industry.

Food security is achievable when individuals have social, physical, and economic access at all times to sufficient, nutritious, and safe food that meets their dietary requirements and food preferences for a healthy and active life. Guaranteeing sustainable food supply is a significant challenge for Singapore, since the country imports roughly all of the food it consumes. In addressing increased consumer demand and future threats such as climate change, new approaches based on established technological platforms are imperative. Singapore's scientific community has embraced metabolomics — a comparatively innovative post-genomic discipline — to enhance understanding of molecular components and the dynamic changes in crops or organisms. The technique involves the elucidation of the complete set of chemical complements in biological samples.

Metabolomics enables analysis of molecular details involving hundreds of distinct chemical identities, including components that determine food features such as fragrance, flavor, and shelf life. Molecular profiling presents a significant opportunity to understand the uniqueness of taste, aroma, macro- and micronutrients, and color, along with their commercial values. The technique empowers Singapore to move from classical analysis of carbohydrates, proteins, and fats toward a more comprehensive molecular understanding of food sustainability and the security of dynamic biosystems. Since more than 90% of Singapore's food products are imported from overseas, challenges are mounting as food must meet stringent standards arising from diversified sources. A comprehensive food traceability system covering the entire production process is clearly necessary for consumer protection and food safety.

Food security is one of the elemental tasks Singapore has undertaken in relation to research and development in urban agribusiness. The government, through its agricultural agencies, has stepped up efforts to ensure the country is food secure for the long term. Application of modern agricultural technology is a top priority, alongside the provision of incentives to small-scale farmers to boost their production levels and reduce costs. Researchers, agricultural analysts, and economists argue that Singapore will eventually transform from a passive food importer to a more active contributor to the regional and global food system.

Singapore's long-term plan in the agricultural sector is to facilitate food security among its urbanized population through vertical cultivation, primarily driven by research and development. However, since Singapore is not an agricultural country and has little land to grow its own food, it has historically depended on imported food. The rapidly growing urban population has prompted the government to reconsider its food importation policy and focus on strategies that would enable the country to produce its own food using modern technology and available labor in rural and urban areas.

Rationale for Vertical Farming in Singapore

According to Ian Graham (2008), farms located in the middle of towns and cities are called skyscraper farms. This method is practiced in Singapore and in many countries across Asia, Europe, and parts of Australia. Vertical farming takes less space than traditional farms; researchers argue that a vertical farm has the capacity to provide food for over 35,000 people (Graham 2008, p. 20). Fish farming, for instance, is commonly practiced in towns under the vertical method of farming. The overall production level would increase, leading to a decrease in prices following an increase in supply to local markets (Graham 2008, p. 20). The skyscrapers have glass walls that allow ample light inside the farm. Graham also raised concerns about modification, fortification, packaging, and tracking of modern food, noting that food produced in the future may not look or taste the same as it does today (Graham 2008, p. 20). Ecological risks resulting from vertical farming are a key concern for environmentalists and Singapore's Department of Environmental Conservation. The government has accordingly developed policies to ensure vertical farming does not jeopardize the lives of humans, animals, aquatic life, or vegetation (Graham 2008, p. 20).

Singapore is an excellent case in point of possible achievements with clear and focused government policy aimed at improving food security (Rouse 2007, p. 10). Singapore has adopted a system of vertical integration whereby all aspects of water supply, along with the equivalent parts of the wastewater system, are managed by a single organization. Michael Rouse (2007) believes that policy regulations governing the utility of water should extend to vertical farming, since water is equally one of the essential resources for this form of husbandry (Rouse 2007, p. 10). Although vertical farming requires substantial government funding, it is economical in terms of space utilization and labor. Singapore, like many other countries in Asia, has embarked on vertical farming to augment food security for a country that has for decades depended on imported food (Rouse 2007, p. 10). Urban agriculture attempts to capture the imagination of Singapore communities, with benefits including savings, transportation efficiency, and the recycling and reuse of organic materials forming the basis of vertical gardening. One of the leading concerns of urban planners is the increasing disconnect between urbanized people and food production.

Hopkins and Goodwin consider vertical farming as gaining overwhelming attention, with commercial economic returns adding to considerable environmental benefits. Greenhouses are prominent not only in Singapore but also in the United States and across European and Asian countries. Urban agriculture, though a good venture, requires considerable funding from various government agencies. Hopkins and Goodwin, like many other authors, nonetheless raise reservations about environmental hazards that may follow the successful adoption of vertical farming in major towns and cities. In urban settings, green roofs and living walls are vital in creating a sustainable environment. Following widespread global warming due to industrialization, weather patterns have become increasingly unpredictable, threatening the sustainability of traditional farming. Adverse effects of climate change on natural systems and biodiversity present potential hazards for human inhabitants.

The most important strategy recently adopted by Singapore aims to turn its domestic market into a test lab for urban agriculture. By pursuing urban farming, the highly urbanized population could finally find a solution to perennial food insecurity rooted in the country's dependence on imported food (Esty & Winston 2009, p. 44). According to Daniel Esty and Andrew Winston, the private sector would play a key role by encouraging large investors to invest in vertical farming around urban areas for the benefit of the urban population (Esty & Winston 2009, p. 44).

The planet is short on water, farmland, and crop management techniques, and faces diseases and unpredictable weather changes. One approach to addressing future food production challenges is to reconsider conventional farming and create new ways of meeting food demands. One of the most interesting recent approaches is the concept of vertical farming. This alternative to flat-land farming is logical, practical, and has attracted supporters worldwide. The benefits of vertical farming are numerous. Planting vertically can yield the same crop output per acre as contemporary outdoor farming over approximately four to six acres of land. There is no need for concern about worms or weather, since vertical gardens are insulated from exterior conditions, with water tightly controlled and growing media kept free of pests and insects.

The water engineering systems designed for vertical farming are highly effective, with pipes feeding plants at every level of the farm by tightly managing the quantity disbursed for maximum impact. The water then enters a complex drainage system and is returned for recycling. Each level of a vertical farm provides an effective environment for the concentration and recycling of waste materials. Harvesting does not require tractors or other fuel-propelled machinery, as the design of a vertical farm incorporates low-maintenance machines and human labor for weeding and harvesting.

According to proponents of vertical farming, launching an enterprise is possible almost anywhere in Singapore. A new unit, once erected, becomes operational quickly by making use of existing infrastructure and starter plants. Vertical farms are ideally constructed adjacent to sources of water in order to minimize potential conflicts over water rights for irrigation. Vertical farms located in densely populated urban areas of Singapore therefore have the capacity to provide ultra-fresh yields on a reliable basis. The energy and quality savings emanating from vertical farms are considerable. Time-consuming deadlines that can threaten the feasibility of perishable products are also eliminated.

Singapore experiences pockets of hunger similar to other developing nations. With approximately 60% of persons currently moving to urban locations, conventional farms are increasingly unable to meet the challenges arising from floods, droughts, and extreme temperatures, which can cause severe damage in a short period. The challenge of feeding the public in an efficient and ecologically sensible manner calls for minimum-waste solutions such as the vertical farming industry. When space is at a premium, citizens who prefer fresh fruits and vegetables will find it advantageous to grow upward. Vertical farming is thus seen as a prospective solution to the growing urban population of Singapore, since a vertical acre corresponds to six or more outdoor acres.

Stakeholders who question the concept of vertical farming may cite the cost of artificial lighting as one of the largest probable expenditures when operating non-natural lights for extended periods. However, with consistent natural lighting, many professionals in Singapore consider vertical farming to be practicable. Vertical farming is therefore an outstanding concept that could help the people of Singapore minimize land use while still feeding themselves. The prerequisites include suitable growing conditions and the necessary procedures for developing the farming structure.

Conclusion

Generally, vertical farming acts as a cost-saving strategy in the agricultural sector. It is essential for reducing the pressure caused by the increasing population on available land. These significances are crucial in the quest to minimize land use while maximizing output. For the realization of sustainable development, Singapore would need to incorporate the vertical farming system because of its direct relevance to the challenges of a rapidly growing urban population. Apart from the conservation of resources, vertical farming also acts as an eco-friendly strategy since it is not associated with the same pollutants as conventional agriculture. Singapore's investment in vertical farming, supported by government policy, academic research, and private sector participation, represents a viable pathway toward long-term food security for one of Asia's most densely populated and land-scarce nations.