Vertical Farming Research Articles

Synergy between vertical farming and the hydrogen economy

Synergy between vertical farming and the hydrogen economy

Controlled Plant Growth in Vertical Farming Systems

The traditional methods of growing crops, such as in greenhouses and open fields, have lately been put to the test by a contemporary invention called vertical farming. According to the amount of the output, the crops are usually stacked shelves and stacked vertically using this method. In order for crops to develop well without any agronomic restrictions, vertical farming integrates a number of technologies, including big data analytics, robotics, the internet of things, artificial intelligence, etc. Structures for vertical farming depend on complete solutions to support the integration of various hardware, data collection, data analysis, and automatic control of the installed devices. Future vertical urban farms will not only boost crop yields or lower production costs, but also vastly enhance the quality of the agricultural goods offered to city inhabitants, minimizing the unfavourable effects of urbanization on the environment. Due to their independence from climatic factors and reduced water requirements, vertical farms can serve the same purposes wherever they are, and locals can gain comparable advantages. The paper presents vertical farm systems as a whole and also a minimum and ideal setting for a vertical farm as a means of increasing food availability and yields, all while ensuring sustainability and environmental protection.

Optimizing Light Use Efficiency and Quality of Indoor Organically Grown Leafy Greens by Using Different Lighting Strategies

Vertical farming is experiencing significant growth, and the optimization of artificial lighting is essential for enhancing the sustainability of this growing system. Therefore, the aim of this study was to examine how light segmentation, the incorporation of a low-intensity lighting phase known as the light compensation point (LCP) instead of the traditional dark phase, and variations in the light spectrum impact the agricultural outcomes of organically cultivated leafy greens. In controlled growth chamber environments, a variety of leafy plant species (Spinacia oleracea L., Ocimum basilicum, Beta vulgaris L., Lactuca sativa L. cv. ‘Garrison’ and ‘Blade’, Brassica rapa cv. ‘Japonica’ and ‘Chinensis’, Brassica juncea cv. ‘Scarlet Frills’ and ‘Wasabina’, Eruca sativa and Perilla frutescens L.) were subjected to four light treatments with varying intensities and durations of lighting, while in a second experiment, five different spectral growing conditions were compared. Irrespective of the plant species, shortening the length of the diel cycle by extending the cumulative daily lighting to 20–24 h per day (5L/1N [5 h at 261 µmol m−2 s−1 + 1 h darkness for a total of 20 h of light per day] and 5L/1LCP [5 h at 256 µmol m−2 s−1 + 1 h LCP at 20 µmol m−2 s−1 for a total of 24 h of light per day]) led to an average increase of +12% in height, fresh weight (+16%), dry weight (+23%), and specific leaf weight (+11%), compared to the control plants (18L/6N; 18 h at 289 µmol m−2 s−1 + 6 h darkness) and 6L/6LCP plants (6 h at 418 µmol m−2 s−1 + 6 h LCP at 20 µmol m−2 s−1 for a total of 24 h of light per day) during the first harvest. This also resulted in better light utilization, expressed as increased fresh (+16%) and dry (+24%) biomass per mol of light received. Conversely, the studied light spectral treatments had no effect on the growth parameters of the four selected species. In conclusion, our study showed that reducing light intensity while extending the photoperiod could potentially represent a cost-effective LED strategy for the indoor cultivation of organically or conventionally grown leafy greens.

Exploring the potential of concentrating solar power technologies for vertical farming in arid regions: The case of Western Iraq

Indoor vertical farming can address future food insecurity by reducing land use and environmental dependence positively mitigating the environmental impacts associated with conventional agriculture. However, its high energy consumption and environmental impact raise concerns. This paper explores the use of Concentrating Solar Power (CSP) to power vertical farming in Iraq's arid regions, using abundant solar resources to reduce environmental impact and energy costs. The study evaluates the feasibility and benefits of integrating CSP technologies into sustainable agricultural practices, considering factors like implementation costs, energy production, and water usage. The study utilized the system advisor model (SAM) to carry out the techno-economic assessment by relocating existing commercial CSP plant in Seville, Spain to six Iraqi locations, following a comprehensive technical site assessment. The energy production level, capacity factor (CF), and levelized cost of electricity (LCOE) of the initial Spanish plant were lower than five of the six selected locations. Haditha and Ar Rutbha cities have the highest annual energy output, 123 GWh and 122 GWh, respectively, surpassing Seville's original plant output, which at 110 GWh performed less than Iraq locations. Next, comparisons are made between conventional farming and vertical farming (VF) cultivation. The study focuses on Romaine lettuce as the benchmark crop due to its prevalence in vertical farms and its suitability for arid climates. VF shows the potential to achieve yields between 41 and 68 kg/m2/y, 63 to 104 times higher than conventional farming in Western Iraq. VF's year-round cultivation with artificial lighting results in 83 times greater energy demands, requiring 25 kWh/kg/y. The findings emphasize the potential of CSP technologies to support sustainable agriculture in Iraq's arid regions. These findings demonstrate the possibility of utilizing solar power for sustainable agriculture in Iraq, offering valuable insights for policymakers and stakeholders seeking cost-effective and energy-efficient solutions.

Reduced Daily Light Integral at the End of Production Can Delay Tipburn Incidence with a Yield Penalty in Indoor Lettuce Production

Indoor vertical farms that grow lettuce commonly encounter tipburn, which is an environmental disorder caused by calcium (Ca) deficiency during the late head-forming stages of lettuce. Characterized by marginal leaf necrosis of young expanding leaves, tipburn reduces marketable yield because of the appearance of these necrotic lesions. Lowering the daily light integral (DLI) to slow the plant growth rate has been a widely practiced approach to avoid tipburn in lettuce, but it largely reduces the final yield. We assessed the effect of lowering the DLI only during the end of production, which is a critical time because it is when tipburn is typically observed. Lettuce plants of tipburn-sensitive cultivars Klee and Rex were grown under a tipburn-inducing condition in growth chambers. Sixteen days after transplanting, the DLI was varied to 100% (L100), 85% (L85), 70% (L70), or 55% (L55) of the original 17.4 mol⋅m−2⋅d−1 to grow the final 12 d. At harvest, tipburn severity was reduced by lowering the DLI, but the magnitude of reduction was cultivar-specific. For ‘Klee’, the lowest tipburn severity was found at L55 (8% ± 2.1% of leaves), but the severity was similar for all other DLI levels (33% ± 3.5% of leaves). For ‘Rex’, tipburn severity was highest in the control (L100; 14% ± 2.8% of leaves) but similar for all other DLI levels (2% ± 0.9% of leaves). Reducing the end-of-production DLI to 55% resulted in a linear decrease in yield by up to 22% and 26% for ‘Klee’ and ‘Rex’, respectively. When the increase in marketable yields and decrease in the electricity cost were considered, decreasing the end-of-production DLI yielded a profitable contribution only for ‘Klee’ (L55). For moderately tipburn-sensitive ‘Rex’, revenue losses attributable to the yield decrease were too large to justify this approach of end-of-production reduced DLI.

Thermal management and energy efficiency analysis of planar-array LED water-cooling luminaires in vertical farming systems for saffron

For saffron (Crocus sativus L.) in vertical farming systems, improper design of LED lighting system may cause the variation of ambient temperature and subsequent influence of development and flowering of corms on the upper space. In the present study, blue-red (B–R) and white (W) planar-array LED luminaires were designed and fabricated with water-cooling system to solve the thermal management problem. LED modules and flow path in luminaires were calculated through the models of point heat source and non-isothermal flow in simulation software. And the temperature field distribution in saffron culture shelf system and the subsequent effect on corm developments were evaluated for the luminaires with three types of structures. The LED water-cooling luminaires without power supplies and dimming control systems (WCL-PS) demonstrated the best thermal management, because the temperature around saffron corms would not be interfered by the heat from the luminaires. Additionally, experiments were conducted to verify the simulation models, with less than 2.4 °C in the maximum deviation. LED modules were also measured as outstanding radiant performance. The photosynthetic photon flux efficacy (PPFE) was respectively 2.74 μmol J−1 for B-LED at 450 nm, 1.65 μmol J−1 for R-LED at 660 nm, as well as 2.75 μmol J−1 for W-LED at correlated color temperature (CCT) 3000 K. At last, white-LED luminaire had a higher PPFE, a lower power consumption and a better temperature field distribution in contrast with blue-red luminaire, which were more recommended for saffron in vertical farming systems.

Artificial intelligence and new business models in agriculture: the “ZERO” case study

PurposeThis study aims to investigate the use of Artificial Intelligence (AI) applied to vertical farms to evaluate whether disrupting technology supports sustainability and increases strategic business model choices in the agricultural sector. The study responds through empirical analysis to the gap on the subject of AI-driven business models present in the growing sector literature.Design/methodology/approachThe paper analyzes the case of “ZERO”, a company linked to the strategy innovation ecosystem of the Ca’ Foscari University of Venice, Italy. The empirical data were collected through a semi-structured questionnaire, interviews and the analysis of public news on the business model available in the analyzed case study. The research is empirical and uses exploratory, descriptive analysis to interpret the findings. The article focuses on the evaluation of AI impact on the agricultural sector and its potential to create new business models.FindingsThe study identified how AI can support the decision-making process leading to an increase in productivity, efficiency, product quality and cost reduction. AI helps increase these parameters through a continuous learning process and local production, and the possible decrease in prices directed toward the goal of zero km food with fresh products. AI is a winning technology to support the key elements of the vertical farm business model. However, it must be coupled with other devices, such as robots, sensors and drones, to collect enough data to enable continuous learning and improvement.Research limitations/implicationsThe research supports new research trends in AI applied to agriculture. The major implication is the construction of ecosystems between farms, technology providers, policymakers, universities, research centers and local consumer communities.Practical implicationsThe ZERO case study underlines the potential of AI as a destructive technology that, especially in vertical farms, eliminates external conditions by increasing productivity, reducing costs and responding to production needs with adequate consumption of raw materials, boosting both environmental and social sustainability.Originality/valueThe study is original, as the current literature presents few empirical case studies on AI-supporting business models in agriculture. The study also favors valuable strategic implications for the policies to be adopted in favor of new business models in agriculture.

Results of Photobiological Studies on Growing Lettuce under Multispectral Radiation Sources

Introduction. When growing plantations through using vertical farm technology, an important factor for regulating energy processes is electromagnetic radiation of irradiators with certain optical wavelengths. Aim of the Article. The aim of the study was to substantiate the technology of application of LED radiation for growing green crops in vegetation facilities under conditions of multispectral radiation by determining the patterns of changes in the qualitative indicators of lettuce varieties Cook, Chrysolite and Afitsion and to create the concept of LED irradiators for controllable crop production. Materials and Methods. The experiment was conducted in the vegetation facility, in three chambers of which different radiation (in spectrum) of biological objects (green plants) was created using irradiators of different spectrum, other things being equal. Results. Experimental studies have determined a range of diverse reactions to radiation of a certain spectral composition. Stable increase in the content of threonine, phenylalanine, valine, serine, alanine and sugars was found in lettuce variety Cook grown under the irradiator with adjustable spectrum. At the same time, a stable decrease in the content of these substances was observed in lettuce variety Chrysolite grown under the irradiator with controlled spectrum. For vitamin C content, the reaction was the opposite: a decrease in vitamin C content in lettuce variety Cook and an increase in vitamin C content in lettuce variety Chrysolite grown in a spectrum-controlled irradiator. For lettuce variety Afitsion, the response to the content of the test substances was dissimilar in both experiments. Discussion and Conclusion. The development and application of LED irradiators with fine turning for controlled crop production should be based on photobiological studies, taking into account specific responses of plantation varieties. For these purposes, there is proposed a technical solution with a set of LEDs controlled by individual channels using digital technologies.

Growing Safer Greens: Exploring Food Safety Practices and Challenges in Indoor, Soilless Production Through Thematic Analysis of Leafy Greens Grower Interviews

Indoor, soilless production—often referred to more broadly as controlled environment agriculture (CEA)—is increasingly used for the cultivation of leafy greens. Minimal information is currently available regarding food safety practices during production and distribution of leafy greens grown within indoor, soilless environments in the United States (U.S.). This study aimed to describe production challenges and implementation of good agricultural practices among CEA growers. Data collection methods included semi-structured interviews (N = 25) and a supplemental online survey completed by growers (N = 12) in the U.S. Out of 18 total responses (i.e., multiple responses allowed per completed survey), survey data indicated that lettuce (n = 5; 27.8%) was the most commonly grown leafy green, followed by culinary herbs (n = 3; 16.7%) and arugula (n = 3; 16.7%). Most growers (n = 7; 58.3%) grew other agricultural products, specifically other crops in addition to leafy greens. Revenue from sales ranged from <US$25 000 to >US$500 000 per year. Meanwhile, nearly half (n = 5; 45.5%) of respondents (N = 11) were uncertain whether their produce was subject to the FSMA Produce Safety Rule. Most survey respondents used vertical farming techniques (5 out of 11; 45.5%) or some variety of greenhouse (4 out of 11; 36.4%). Based on 35 total responses, leafy greens were most commonly sold to “Commercial Restaurants” (n = 7; 20.0%), “Grocery Stores” (n = 7; 20.0%), “Institutional Foodservice Establishments (hospitals, schools, childcare, long-term care)” (n = 6; 17.1%), and “Wholesaler/Distributers” (n = 6; 17.1%). The 11 interview questions elucidated three major themes: contextual, barriers to risk management and regulatory compliance, and research needs. Thirteen subthemes were identified, and an example of a subtheme within each major theme, respectively, includes worker hygiene and training, regulatory and certification environment, and risk assessments of individual issues.

Vertical Farming

&#x0D; Of those issues that have concerned the government, academics and the public throughout the world, urban sprawl is one of the most prominent. There are conflicting views toward this growing trend. While it has been taken as a positive development in many newly emerging cities, it is increasingly perceived as a threat to the urban environment and considered as a trigger for numerous social problems, such as food shortages, increasing energy usage, global warming and deterioration of environment and urban areas. one feasible solution which can tackle this issue is vertical farming (VF). Promoting vertical farms in the cities can affect urban areas at the environmental, social and economic levels. Vertical farms do indeed have many advantages. A combination of new technologies in the fields of architecture, engineering and agriculture is needed to achieve maximum yield in this approach. therefore, this study is aimed to evaluate the advantages and possibility of vertical farming by reviewing existing and researched VF projects worldwide from 2005 to 2022. The aspects and phenomenon are derived from literature. The aspects offered can be a guide for implementation development and planning for innovative and farming industries of Vertical Farming in undeveloped countries.

Biofortification of kale microgreens with selenate-selenium using two delivery methods: Selenium-rich soilless medium and foliar application

Selenium (Se) is essential for human health as it is involved in various fundamental biological functions. This study aimed to assess the effects of Se enrichment in kale microgreens through biofortification in a soilless cultivation system. Two Se (as sodium selenate) application methods were assessed, including supplementation into the nutrient solution or as a foliar spray at four concentrations: 0, 10, 20 and 40 µM Se in a completely randomized design considering triplicates. For this purpose, minerals, nitrate and ammonium content, as well as fresh yield and dry matter of kale microgreens, were recorded after a 14-day growing period in an environmentally controlled vertical farm. Results showed that kale microgreens successfully accumulated up to 893.3 and 24 µg Se/ kg dry matter under the nutrient solution and foliar treatments, respectively, while yield remained unaffected. Selenium (Se) enrichment of the nutrient solution at 20 µM Se concentration resulted in the optimum treatment for fresh consumption purposes and supplying this element in human diets in the future, providing adequate dietary Se in less than five grams of the fresh kale microgreens.

Experimental Performance Evaluation of a Hybrid Parabolic Solar Lighting System for Use in Agricultural Environments

This study presents a solar lighting system designed for indoor farming to provide natural light. The proposed system uses a parabolic dish concentrator integrating with polymethyl methacrylate optical fibers to direct concentrated light into a desired place. A water cooling mechanism is also used to prevent heat transmission to the optical fibers. The indoor sunlight's distribution is studied using a designed darkroom. The evaluation is carried out in 7 days, from November 23 to 29, from 8 a.m. to 4 p.m., to ensure the stability of the system under various weather conditions. The results of the experiments show that the receiver's temperature can remain at 63 °C on sunny days under a clear sky, even when the maximum value of solar radiation is about 982 W m−2 with the highest air temperature of 19 °C. During the experiments, the solar illuminance ranges from a maximum of 118,821.85 lx to a minimum value of 374.9.6 lx. The overall optical efficiency of the system, considering optical components, ranges from 31% to 32% under various outdoor illuminance levels. Overall, it is confirmed that the developed solar lighting system offers a applicable method to naturally illuminate protected agricultural environments, enhancing the quality of the growing crops.

Assessment of the Potential to Use the Expelled Heat Energy from a Typical Data Centre in Ireland for Alternative Farming Methods

Data centres, though a necessary part of modern society, are being stigmatised for consuming vast amounts of electricity for their operational and cooling needs. Due to Ireland’s reliance on fossil fuels to meet the increased energy demand of data centres, the data centres are contributing significantly to Ireland’s total carbon emissions. As much of this energy is expelled from data centres as waste heat energy, the potential for recycling some of this wasted heat energy was explored using environmentally friendly systems from recent publications. The recovered waste heat energy was applied in a vertical farming system, and the benefits of this waste heat to the vertical farm were analysed and quantified in two scenarios. Using conservative estimates, it was predicted that each vertical farm could be between 5–23% the size of the data centre and produce enough food to feed between 14–61 adults their daily calorie needs, and between 13–58 people their daily fresh produce requirements, depending on the scenario applied. For a more accurate prediction, each vertical farm would have to be assessed on a case-by-case basis, as there is no current research in this area. However, there was not enough data available on Irish data centres to perform these calculations.

The Role of Agricultural Systems in Teaching Kitchens: An Integrative Review and Thoughts for the Future.

Diet-related chronic disease is a public health epidemic in the United States. Concurrently, conventional agricultural and food production methods deplete the nutritional content of many foods, sever connections between people and the origin of their food, and play a significant role in climate change. Paradoxically, despite an abundance of available food in the US, many households are unable to afford or attain a healthful diet. The linkages between agriculture, health, and nutrition are undeniable, yet conventional agriculture and healthcare systems tend to operate in silos, compounding these pressing challenges. Operating teaching kitchens in collaboration with local agriculture, including farms, community gardens, vertical farms, and urban agriculture, has the potential to catalyze a movement that emphasizes the role of the food system in promoting human and planetary health, building resilient communities, and encouraging cross-disciplinary collaboration. This paper reviews the current state of agricultural systems, food is medicine, consumer behavior, and the roles within these sectors. This is followed by a series of case studies that fill the gaps between TKs and agriculture. The authors summarize opportunities to combine the knowledge and resources of teaching kitchens and agriculture programs, as well as challenges that may arise along the way.

Thermo-fluid dynamic analysis of the air flow inside an indoor vertical farming system

In this study, computational fluid dynamics (CFD) is used to assess the thermo-fluid dynamic behaviour of an indoor vertical farming system. Experimentally driven three-dimensional k-ε steady simulations are performed using a species transport model to account for relative humidity. In-field sensor measurements are used to set the boundary conditions for the simulations and to validate the results in terms of temperature and humidity distribution within the growing cell. The entire cell, consisting of eight levels of growing tables is simulated under daylight conditions, including the heat source from LED lights in the thermo-fluid dynamic air flow field. Results help to understand the main features of the air flow distribution. The comparison of the numerical results with measurements demonstrate the ability of the numerical approach to characterize the thermo-fluid dynamic flow field of the indoor farming system and the reliability of well-calibrated CFD simulations in controlling the air flow distribution, which is necessary to reduce energy consumption and to improve plant growth quality. Critical regions for the plant growth are identified within the farm based on the study of air speed uniformity and on the analysis of vapor pressure deficit (VPD). A growing table efficiency index is introduced based on the definitions of two dimensionless objective uniformity parameters. The analysis of these indices helps identifying differences in the fluid dynamic behaviour of the upper and lower floors of the cell and some deficiencies in the ventilation system ability to provide uniform air conditions to all the growing tables. Results show a symmetric behaviour of the left and right layers for upper floors, with tables in front of the evaporators showing better efficiencies. An opposite behaviour is observed on the lower floors, exhibiting a strong asymmetry between left and right layers. On the other hand, the VPD analysis reveale that certain regions near the evaporators and walls (with good flow uniformity) experience extreme conditions that could affect plant growth. The approach presented in this paper provides a detailed understanding of the indoor vertical farming environment and its impact on growth and yield of leafy greens. This, in turn, helps in the effort to optimize the vertical farm ventilation system and thus its energy, which remains the main issue of such cultivation plants.

The configuration optimization of the plants in vertical farming by 3D modeling

Vertical farming, a terminology in landscape architecture, is designed to cater for the demand of vegetation under the impact of excessive exploid of land, especially in densely-populated areas. The study takes vertical farming in Singapore as an example, applies 3D modeling to investigate the effect of different arrangement patterns on plant light absorption in vertical farms, and proposes some measures. Through the 3D simulation process, each square of the soil for planting can be quantified in sunlight-exposure hour. The experiment result shows that configuration with an array piling up is judicious and feasible for greenhouse growth, especially for commercial usages. Different configurations of plants influence the efficiency of utilizing sunlight, and there is a better layout for a particular site in different usages. For some cities far away from tropical areas, this configuration may alleviate the impact of lacking sunlight exposure. The main advantage of vertical farms is efficiency, as they require less land and water with more yield per acre compared to conventional farms.

The assessment of biophilic features in residential buildings: a case from Dubai

PurposeThis study explores the difference in occupants' satisfaction with biophilic features in high-rises, townhouses, and villas in Dubai to identify new strategies that promote more human-nature connections. The study also serves as a benchmark for applying Biophilic Design in the Gulf region and bridging between biophilic theory and practice.Design/methodology/approachA mixed-mode approach was used, combining surveys from occupants and interviews with experts (3 policymakers, a developer, and a biophilic design educator). The survey collected occupants' satisfaction and acceptance of proposed strategies, and the interviews validated the potentially accepted solutions.FindingsThe results indicated high overall satisfaction with biophilic features despite neutral/low satisfaction with specific features. In high-rise buildings, respondents showed high acceptance for different proposed strategies; 76.4% for adaptive control of balconies by season, 82.7% for utilizing outdoor roof gardens, 78.9% for indoor gardens, and 71.8% for vertical farming. Additionally, respondents accepted social strategies; 63.6% agreed to join clubs promoting environmental events, and 75.4% accepted participating in outdoor recreational activities accompanied by local environmental education. The interviews showed an inclination toward incentive programs instead of obligations.Originality/valueUnlike former studies that assessed indoor environmental qualities without referring to biophilic theory or limited reference to biophilic design, this study provides a novel approach for bridging theory and practice by integrating biophilic design into residential buildings for Dubai's future developments. Additionally, the authors suggest validated proposals to enhance the occupants' biophilic living experience, serving as a benchmark for biophilic application in the Gulf region.

Synergetic integration of vertical farms and buildings: reducing the use of energy, water, and nutrients

Vertical farms use some resources very efficiently. However, their electricity use is considerable, and a significant amount of waste heat is produced. This paper investigates how the integration of vertical farms in buildings could reduce the use of energy, water, and nutrients collectively across both entities by leveraging potential resource synergies. The paper considered the integration of vertical farms in apartments, offices, restaurants, swimming pools, and supermarkets located in the Netherlands. For each typology, the floor area heated and the amount of building users fed by one m2 of one production layer within the vertical farm was calculated, along with required outputs of water and nutrients from the building to sustain the vertical farm. The energy savings of different integration strategies were calculated for each building typology in comparison to a non-integrated approach. Results showed that the synergetic integration of vertical farms with buildings reduced the year-round energy use of the climate systems of both entities collectively by between 12 and 51%. The integration of vertical farms with buildings decreases the use of energy, water, and nutrients from external sources and offers great potentials to reduce the environmental impacts of both entities, whilst producing food in urban environments.

Lemnaceae as Novel Crop Candidates for CO2 Sequestration and Additional Applications.

Atmospheric carbon dioxide (CO2) is projected to be twice as high as the pre-industrial level by 2050. This review briefly highlights key responses of terrestrial plants to elevated CO2 and compares these with the responses of aquatic floating plants of the family Lemnaceae (duckweeds). Duckweeds are efficient at removing CO2 from the atmosphere, which we discuss in the context of their exceptionally high growth rates and capacity for starch storage in green tissue. In contrast to cultivation of terrestrial crops, duckweeds do not contribute to CO2 release from soils. We briefly review how this potential for contributions to stabilizing atmospheric CO2 levels is paired with multiple additional applications and services of duckweeds. These additional roles include wastewater phytoremediation, feedstock for biofuel production, and superior nutritional quality (for humans and livestock), while requiring minimal space and input of light and fertilizer. We, furthermore, elaborate on other environmental factors, such as nutrient availability, light supply, and the presence of a microbiome, that impact the response of duckweed to elevated CO2. Under a combination of elevated CO2 with low nutrient availability and moderate light supply, duckweeds' microbiome helps maintain CO2 sequestration and relative growth rate. When incident light intensity increases (in the presence of elevated CO2), the microbiome minimizes negative feedback on photosynthesis from increased sugar accumulation. In addition, duckweed shows a clear propensity for absorption of ammonium over nitrate, accepting ammonium from their endogenous N2-fixing Rhizobium symbionts, and production of large amounts of vegetative storage protein. Finally, cultivation of duckweed could be further optimized using hydroponic vertical farms where nutrients and water are recirculated, saving both resources, space, and energy to produce high-value products.

Vertical Farming of Horticulture Crops: A Recent Trend

Vertical farming now a day is gaining status as complementary to traditional farming practices, allowing for more sustainable food production for the world's growing population. While early studies on vertical farming systems focused primarily on the advancement of technology through innovative designs, hydroponic cultivation automation monitoring, and the use of advanced LED lighting systems, more recent studies have focused on the resilience and circularity of vertical farming. Over the last few decades, there have been elevated concerns about ethical cultivation practices and environmental issues, reliance on non renewable resources, commitment to biodiversity conservation, ration scarcity, and its leverage to hunger. Environmental issues, such as economic justice issues, biodiversity commitments, and a focus on food security issues, have gained traction in social work. Vertical farming is one of the solutions to many problems including food and nutritional security, environment safety, resource utilization, land fragmentation, climate resilience agriculture, etc.