Comparisons of Different Lighting Systems for Horticultural Seedling Production Aimed at Energy Saving

García‐Caparrós, Pedro; Chica, Rosa María; Almansa, Eva María; Rull, Antonio; Rivas, Lara Alicia; García-Buendía, Antonio; Barbero, Francisco Javier Roldán; Lao, María Teresa

doi:10.3390/su10093351

Cited by 15 publications

(16 citation statements)

References 31 publications

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“…In higher latitude locations, SL may be required to produce quality greenhouse crops during winter months through the management of lighting schedules and photoperiod. In certain situations, increasing the daily light integral (DLI) and optimizing the spectral quality has the potential to improve biomass production and shorten growth cycles (Gouvea et al, 2012;Mitchell et al, 2015;Samuolien_ e et al, 2012). LED lighting systems have the potential to replace traditional lighting systems in a wide range of horticultural applications and may help growers reduce energy costs while maintaining/improving quality throughout all growing seasons.…”

mentioning

confidence: 99%

Supplementary Blue and Red LED Narrowband Wavelengths Improve Biomass Yield and Nutrient Uptake in Hydroponically Grown Basil

Hammock¹,

Kopsell²,

Sams³

2020

horts

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Light emitting diodes (LEDs) can produce a wide range of narrowband wavelengths with varying intensities. Previous studies have demonstrated that supplemental blue (B) and red (R) wavelengths from LEDs impact plant development, physiology, and morphology. High-pressure sodium (HPS) lighting systems are commonly used in greenhouse production, but LEDs have gained popularity in recent years because of their improved energy efficiency and spectral control. Research is needed to determine the efficacy of supplementary B and R LED narrowband wavelengths compared with traditional lighting systems like HPS in terms of yield, quality, and energy consumption for a variety of greenhouse-grown high-value specialty crops. The objective of this study was to determine the impact of LED and HPS lighting on greenhouse hydroponic basil (Ocimum basilicum var. ‘Genovese’) biomass production and edible tissue nutrient concentrations across different growing seasons. Basil was chosen because of its high demand and value among restaurants and professional chefs. A total of eight treatments were used: one nonsupplemented natural light (NL) control; one HPS treatment; and six LED treatments (peaked at 447 nm/627 nm, ±20 nm) with progressive B/R ratios (10B/90R; 20B/80R; 30B/70R; 40B/60R; 50B/50R; and 60B/40R). Each supplemented light (SL) treatment provided 8.64 mol·m−2·d−1 (100 µmol·m−2·s−1, 24 h·d−1). The daily light integral (DLI) of the NL control averaged 9.5 mol·m−2·d−1 across all growing seasons (ranging from 4 to 18 mol·m−2·d−1). Relative humidity averaged 50%, with day/night temperatures averaging 27.4 °C/21.8 °C, respectively. LED treatments had the greatest total fresh biomass (FM) and dry biomass (DM) accumulation; biomass for LED treatments were 1.3 times greater on average than HPS, and 2 times greater than the NL control. Biomass partitioning revealed that the LED treatments had more FM and DM for the individual main stem, shoots, and leaves of each plant at varying levels. LED treatments resulted in greater height and main stem diameter. Some essential nutrient concentrations were impacted by SL treatments and growing season. An energy analysis revealed that on average, narrowband B/R LED treatments were 3 times more energy efficient at increasing biomass over HPS. LED treatments reduced SL energy cost per gram FM increase by 95% to 98% when compared with HPS. In addition, the rate of electricity consumption to biomass increase varied across LED treatments, which demonstrates that basil uses different B/R narrowband ratios at varying efficiencies. This experiment shows that spectral quality of both supplemental sources and natural sunlight impacts primary metabolic resource partitioning of basil. The application of LED lighting systems to supplement natural DLI and spectra during unfavorable growing seasons has the potential to increase overall biomass accumulation and nutrient concentrations in a variety of high-value specialty crops.

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mentioning

confidence: 99%

Supplementary Blue and Red LED Narrowband Wavelengths Improve Biomass Yield and Nutrient Uptake in Hydroponically Grown Basil

Hammock¹,

Kopsell²,

Sams³

2020

horts

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“…Concerning agriculture, the effects of lighting on the growth and maturation of different vegetable species have been known for ages, but the application of the techniques of illumination, including different wavelengths [14,22], illuminance levels, and combination of sunlight with artificial light has not been considered as a part of a global philosophy of lighting seeking multi-approach to sustainable development. Furthermore, interesting proposals combining the shadowing of greenhouses with electrical production have been possible thanks to the use of solar panels on the crops [15].…”

Section: Non-conventional Uses Of Lightingmentioning

confidence: 99%

“…That is what we have classically called "sustainable lighting". However, it is becoming more and more evident that some kinds of lighting can directly contribute to the increase of the agricultural production [14,15], the preservation of cultural heritage [16,17], or the attachment to traditional livelihoods [18], among others.…”

Section: Introductionmentioning

confidence: 99%

The Perspective of Total Lighting as a Key Factor to Increase the Sustainability of Strategic Activities

Peña-García

Salata

2020

Sustainability

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In the last decades, lighting has evolved from a branch of engineering ensuring safety and performance in indoor and outdoor installations, to a key discipline interacting with a wide spectrum of fields and having a deep impact on our daily lives. Although this evolution also applies to other areas of knowledge, the special features of lighting make its potential and also its limitations different. It is not the typical field where a well-established mathematical framework allows a departure from well-defined input and identifying clear effects and conclusions. The reason is that lighting is a field dealing with the interaction between a physical phenomenon and a physiological and psychological system, the human being. In addition to the complexity of its basis, the relationship between lighting and sustainability has become stronger in recent years. This relationship is bi-directional in some cases: on one hand, advanced societies require more and more complex lighting installations, which means high energy consumption, use of raw materials, financial costs, manufacturing and maintenance processes, waste and emissions to the atmosphere. On the other hand, good lighting has an impact on issues like productivity, well-being, happiness, disease avoidance, safety, and many other qualitative aspects whose direct or indirect impact on sustainability is remarkable. This work will analyze how lighting can give answers to questions related to sustainability, not only from the classic topics of energy consumption and waste management, but from a wider and global perspective. The results of these works are analyzed, and the basis of the new framework of total lighting, discussed.

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“…Nowadays, the production of horticultural seedlings in southern Spain totals around 1,800,000,000 seedling plants. To produce horticultural seedlings, supplementary artificial lighting has been considered as economically practical since it allows growers to improve profits, mainly due to a faster development and quality of plants, therefore improving their sales [2].…”

Section: Introductionmentioning

confidence: 99%

Physiological Responses of Tomato and Cucumber Seedlings under Different Light–Dark Cycles

et al. 2020

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Tomato and cucumber seedlings were grown in a growth chamber to evaluate the effects of different cycles of light–dark exposure conditions (T0 (control treatment) (1 cycle of 24 h distributed in 18 h of light exposure and six hours of dark), T1 (two cycles of 12 h distributed in nine hours of light exposure and three hours of dark) and T2 (three cycles of eight hours distributed in six hours of light exposure and two hours of dark) on growth, nutrient status, pigment concentration and physiological changes. Total dry weight showed different behaviors in both species, since in tomato the total dry weight remained unchanged under varying light–dark cycles, whereas in cucumber seedlings there was a clear decrease compared to the control treatment. In both species, plants grown under T2 showed the best water content. Nitrogen, P and K content—as well as partitioning in the different organs of the plants—displayed different patterns under varying cycles of light–dark conditions in both species. Chlorophyll (b and a + b) concentration decreased significantly in both species in T1 and T2 compared to the control treatment (T0). At physiological level, the concentration of total soluble sugars and proline in leaf showed the highest value in the control treatment with 18 h of light and six hours of dark.

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Comparisons of Different Lighting Systems for Horticultural Seedling Production Aimed at Energy Saving

Cited by 15 publications

References 31 publications

Supplementary Blue and Red LED Narrowband Wavelengths Improve Biomass Yield and Nutrient Uptake in Hydroponically Grown Basil

Supplementary Blue and Red LED Narrowband Wavelengths Improve Biomass Yield and Nutrient Uptake in Hydroponically Grown Basil

The Perspective of Total Lighting as a Key Factor to Increase the Sustainability of Strategic Activities

Physiological Responses of Tomato and Cucumber Seedlings under Different Light–Dark Cycles

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