Control of Morphology by Manipulating Light Quality and Daily Light Integral Using LEDs

Craver, Joshua K.; López, Roberto G.

doi:10.1007/978-981-10-1848-0_15

Cited by 9 publications

(9 citation statements)

References 33 publications

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“…The differences in shoot dry weight could be explained by differences in needle development under inadequate light as explained before. In addition, and similar to other studies in the field of horticulture, higher light intensity promoted biomass production yielding compacter and heavier seedlings (Craver and Lopez 2016;Gerovac et al 2016).…”

Section: Discussionsupporting

confidence: 87%

“…Once restricted to experiments in laboratories (Bula et al 1994) and space research (Barta et al 1992), the use of LED lamps as light source for horticultural plant growth has rapidly increased since the 1990s and is one of the fastest growing areas of new greenhouse technology (Mitchell et al 2012;Nelson and Bugbee 2014). The LED technology has several advantages such as potential reduction in energy consumption, longer lifetime, lower radiative heat emission, high energy-conversion efficiency, adjustable light intensity, and customizable spectra (Massa et al 2008;Morrow 2008;Craver and Lopez 2016).…”

Section: Introductionmentioning

confidence: 99%

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Light quality and intensity of light-emitting diodes during pre-cultivation of Picea abies (L.) Karst. and Pinus sylvestris L. seedlings – impact on growth performance, seedling quality and energy consumption

Velasco

Mattsson

2019

Scandinavian Journal of Forest Research

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Section: Discussionsupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Light quality and intensity of light-emitting diodes during pre-cultivation of Picea abies (L.) Karst. and Pinus sylvestris L. seedlings – impact on growth performance, seedling quality and energy consumption

Velasco

Mattsson

2019

Scandinavian Journal of Forest Research

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“…Literature about the effect of light quality on leaf coloration of seedlings is rather scarce, and only a few studies address it. For example, Craver and Lopez [ 18 ] suggested that LEDs with specific light qualities can be used for a few days to manipulate leaf coloration and promote the marketability of lettuce.…”

Section: Resultsmentioning

confidence: 99%

Influence of Light Spectra from LEDs and Scion × Rootstock Genotype Combinations on the Quality of Grafted Watermelon Seedlings

Bantis

Dangitsis

Κουκουνάρας

2021

Plants

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Grafting is the main means of propagation for watermelon crops. The aim of the present study was to evaluate whether light quality during graft healing variably affects different scion × rootstock genotype combinations. Two watermelon hybrid scions (Sunny Florida F1 and Celine F1) and two interspecific squash rootstocks (Radik and TZ-148) were used, and four scion × rootstock genotype combinations derived. After grafting, we tested seven light-emitting diodes (LEDs), which provided narrow-band red (R) and blue (B); R-B with 36% (36B), 24% (24B), and 12% (12B) blue; 12B with additional far-red (12B+FR); and white (W), in a healing chamber. In three genotype combinations, shoot length, leaf area, and shoot biomass were mainly enhanced under red-blue LEDs, while stem diameter was greater under R. In contrast, dry weight of roots, Dickson’s quality index, and ratio of shoot dry weight/length were variably affected in each genotype combination. From the results, it is concluded that light treatments differentially affected each genotype combination, but some parameters involving biomass production show genotypic dependency.

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“…This spectral range is known as photosynthetically active radiation (PAR) [15,16]. Although the light quality, which is determined by the spectral distribution, has a strong influence in the plant's morphology [17][18][19][20]; it is the PAR quantity that mainly affects growth and biomass production [21][22][23][24][25]. The total amount of radiation reaching the canopy is determined by the light intensity at the surface and the duration of exposure.…”

Section: Introductionmentioning

confidence: 99%

Enabling Year-round Cultivation in the Nordics - Agrivoltaics and Adaptive LED Lighting Control of Daily Light Integral

Velasco¹

2021

Preprint

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High efficacy LED lamps combined with adaptive lighting control and greenhouse integrated photovoltaics (PV) could enable the concept of year-round cultivation and become a feasible option even in the harsh climate of the Nordic countries. Meteorological satellite data of this region was analyzed in a parametric study to evaluate the potential of these technologies. The generated maps showed monthly average temperatures fluctuating from -20°C to 20°C throughout the year. The natural photoperiod and light intensity also changed drastically, resulting in monthly average daily light integral (DLI) levels ranging from 45-50 mol·m-2·d-1 in summer and contrasting with 0-5 mol·m-2·d-1 during winter. To compensate, growth room cultivation independent from outdoor conditions could be used in winter. Depending on the efficacy of the lamps, the electricity required for sole-source lighting at 300 µmol·m-2·s-1 for 16 hours would be between 1.4 and 2.4 kWh·m-2·d-1. Greenhouses with supplementary lighting could help start the cultivation earlier in spring and extend it further into autumn. The energy required for lighting highly depends on several factors such as the natural light transmittance, the light threshold settings and the lighting control protocol, resulting in electric demands between 0.6 and 2.4 kWh·m-2·d-1. Integrating PV on the roof or wall structures of the greenhouse could offset some of this electricity, with specific energy yields ranging from 400 to 1120 kWh·kWp-2·yr-1 depending on the region and system design.

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Control of Morphology by Manipulating Light Quality and Daily Light Integral Using LEDs

Cited by 9 publications

References 33 publications

Light quality and intensity of light-emitting diodes during pre-cultivation of Picea abies (L.) Karst. and Pinus sylvestris L. seedlings – impact on growth performance, seedling quality and energy consumption

Light quality and intensity of light-emitting diodes during pre-cultivation of Picea abies (L.) Karst. and Pinus sylvestris L. seedlings – impact on growth performance, seedling quality and energy consumption

Influence of Light Spectra from LEDs and Scion × Rootstock Genotype Combinations on the Quality of Grafted Watermelon Seedlings

Enabling Year-round Cultivation in the Nordics - Agrivoltaics and Adaptive LED Lighting Control of Daily Light Integral

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