Vegetable Growth as Affected by on-Off Light Intensity Developed for Vegetable Factory

Hashimoto, Yasushi; Yi, Y.; Nyunoya, Futoshi; Anzai, Yoshinori; Yamazaki, Hiroko; Nakayama, Shigeki; Ikeda, Akira

doi:10.17660/actahortic.1988.229.26

Cited by 4 publications

(2 citation statements)

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“…Recently, plant factories that use artificial lights and nutrients for plant production have become popular and important owing to the increasing prices of crops and potential for a more stable food production system (Um et al, 2010). Plant factories generally use two types of light (sunlight and artificial light) in various combinations (Hashimoto et al, 1987).…”

Section: Introductionmentioning

confidence: 99%

Growth and Bioactive Compounds of Lettuce as Affected by Light Intensity and Photoperiod in a Plant Factory Using External Electrode Fluorescent Lamps

Cho¹,

Yoo²,

Kim³

et al. 2020

HST

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External electrode fluorescent lamps (EEFLs) are a new, efficient light source that can be used in plant factories. We examined the effects of light intensity and photoperiod combinations on growth, total phenolic content, antioxidant capacity, and light use efficiency of lettuce (Lactuca sativa 'Cheongchima') in a plant factory employing EEFLs. Two-week-old seedlings were grown for 3 weeks at a photosynthetic photon flux density of 150 (150P) or 200 (200P) μmol•m -2 •s-1 under 12, 16, 20, or 24 h photoperiods. The air temperature was maintained at 20 ± 2°C and Yamazaki nutrient solution was supplied using a deep flow technique. Fresh shoot and root weights increased as photoperiod was extended, becoming greatest under the 150P/24 h condition. The shoot/root ratio was lowest at the 24 h photoperiod under 150P and 200P conditions. Leaf length decreased at longer photoperiods, but leaf width and number was increased; therefore, leaf shape became broader under longer photoperiods. Leaf area increased at the 150P/20 h condition but decreased at the 200P/24 h condition. Specific leaf weight (thickness) increased significantly as photoperiod was extended irrespective of light intensity and became greater under 200P than 150P. Total phenolic content and antioxidant capacity increased continuously with increasing photoperiods under 150P; however, in the 200P treatment, both increased up to 20 h, then decreased under the 24 h photoperiod. Light use efficiency was generally higher under 150P, but became similar at either light intensity under the 24 h period. Considering the growth rate, leaf size, antioxidant capacity, and cropping cycle, the 150P/20 h condition was deemed to be the most efficient and economical for growth of 'Cheongchima' lettuce in a plant factory system.

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Section: Introductionmentioning

confidence: 99%

Growth and Bioactive Compounds of Lettuce as Affected by Light Intensity and Photoperiod in a Plant Factory Using External Electrode Fluorescent Lamps

Cho¹,

Yoo²,

Kim³

et al. 2020

HST

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“…While at 11 °C, the O 2 flash yield increased with T L , asymptotically approaching the same yield observed for T L = 425 ms at 25 °C. However, the improvement of yield in lettuce production was not observed using high frequency (37 kHz) fluorescent lamps compared with regular (60 Hz) florescent lamps (Hashimoto et al, 1988). Tennessen et al (1995) used a different approach in studying efficiency of continuous and intermittent light.…”

Section: Methodsmentioning

confidence: 99%

Effects of Frequency and Duty Ratio on the Growth of Potato Plantlets In Vitro Using Light-emitting Diodes

Jao¹,

Fang²

2004

HortSci

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Effects of intermittent light on photomixotrophic growth of potato plantlets in vitro and the electrical savings that could be realized by adjusting the frequency and duty ratio of light-emitting diodes (LEDs) were investigated and compared to the use of conventional tubular fluorescent lamps (TFLs). TFLs provide continuous fluctuating light at 60 Hz and LEDs provide continuous nonfluctuating or intermittent/pulse light depend on the preset frequency and duty ratio. In total, eight treatments were investigated with varying light source, frequency, duty ratio and photoperiod. Results indicated that if growth rate is the only concern, LEDs at 720 Hz [1.4 milliseconds (ms)] and 50% duty ratio with 16-h light/8-h dark photoperiod stimulated plant growth the most. However, if energy consumption is the major concern, using LEDs at 180 Hz (5.5 ms) and 50% duty ratio with 16-h light/8-h dark photoperiod would be the best choice for illuminating potato plantlets without significantly sacrificing plant growth, especially when energy for heat removal is also considered.

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Effects of Sources and Quality of LED Light on Response of <i>Lycium chinense</i> of Photosynthetic Rate, Transpiration Rate, and Water Use Efficiency in the Smart Farm

Lee¹,

Hong²,

Lee³

et al. 2019

Korean J. Ecology and Environment.

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Vegetable Growth as Affected by on-Off Light Intensity Developed for Vegetable Factory

Cited by 4 publications

References 0 publications

Growth and Bioactive Compounds of Lettuce as Affected by Light Intensity and Photoperiod in a Plant Factory Using External Electrode Fluorescent Lamps

Growth and Bioactive Compounds of Lettuce as Affected by Light Intensity and Photoperiod in a Plant Factory Using External Electrode Fluorescent Lamps

Effects of Frequency and Duty Ratio on the Growth of Potato Plantlets In Vitro Using Light-emitting Diodes

Effects of Sources and Quality of LED Light on Response of <i>Lycium chinense</i> of Photosynthetic Rate, Transpiration Rate, and Water Use Efficiency in the Smart Farm

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