온실재배 케일의 생장에 미치는 보광효과
Effect of Supplementary Radiation on Growth of Greenhouse-Grown Kales
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참고문헌
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초록
BACKGROUND: For commercial production ofgreenhouse crops under shorter day length condition,supplementary radiation has been usually achieved by theartificial light source with higher electric consumption suchas high-pressure sodium, metal halide, or incandescentlamps. Light-Emitting Diodes (LEDs) with severalcharacteristics, however, have been considered as a novellight source for plant production. Effects of supplementarylighting provided by the artificial light sources on growth ofKale seedlings during shorter day length were discussed inthis experiment. METHODS AND RESULTS: Kale seedlings were grownunder greenhouse under the three wave lamps (3 W),sodium lamps (Na), and red LEDs (peak at 630 nm) duringsix months, and leaf growth was observed at intervals ofabout 30 days after light exposure for 6 hours per day atsunrise and sunset. Photosynthetic photon flux (PPF) ofsupplementary red LEDs on the plant canopy wasmaintained at 0.1 (RL), 0.6 (RM), and 1.2 (RH) μmol/m2/sPPF. PPF in 3 W and Na treatments was measured at 12 μmol/m2/s. Natural light (NL) was considered as a control. Leaf fresh weight of the seedlings was more than 100%increased under the 3 W, Na and RH treatment compared tonatural light considering as a conventional condition. Sugarsynthesis in Kale leaves was significantly promoted by theRM or RH treatment. Leaf yield per 3.3 m2 exposed by redLEDs of 1.2 μmol/m2/s PPF was 9% and 16% greater thanin 3W or Na with a higher PPF, respectively. CONCLUSION: Growth of the leafy Kale seedlings weresignificantly affected by the supplementary radiationprovided by three wave lamp, sodium lamp, and red LEDswith different light intensities during the shorter day lengthunder greenhouse conditions. From this study, it wassuggested that the leaf growth and secondary metabolismof Kale seedlings can be controlled by supplementaryradiation using red LEDs of 1.2 μmol/m2/s PPF as well asthree wave or sodium lamps in the experiment.
Abstract
BACKGROUND: For commercial production ofgreenhouse crops under shorter day length condition,supplementary radiation has been usually achieved by theartificial light source with higher electric consumption suchas high-pressure sodium, metal halide, or incandescentlamps. Light-Emitting Diodes (LEDs) with severalcharacteristics, however, have been considered as a novellight source for plant production. Effects of supplementarylighting provided by the artificial light sources on growth ofKale seedlings during shorter day length were discussed inthis experiment. METHODS AND RESULTS: Kale seedlings were grownunder greenhouse under the three wave lamps (3 W),sodium lamps (Na), and red LEDs (peak at 630 nm) duringsix months, and leaf growth was observed at intervals ofabout 30 days after light exposure for 6 hours per day atsunrise and sunset. Photosynthetic photon flux (PPF) ofsupplementary red LEDs on the plant canopy wasmaintained at 0.1 (RL), 0.6 (RM), and 1.2 (RH) μmol/m2/sPPF. PPF in 3 W and Na treatments was measured at 12 μmol/m2/s. Natural light (NL) was considered as a control. Leaf fresh weight of the seedlings was more than 100%increased under the 3 W, Na and RH treatment compared tonatural light considering as a conventional condition. Sugarsynthesis in Kale leaves was significantly promoted by theRM or RH treatment. Leaf yield per 3.3 m2 exposed by redLEDs of 1.2 μmol/m2/s PPF was 9% and 16% greater thanin 3W or Na with a higher PPF, respectively. CONCLUSION: Growth of the leafy Kale seedlings weresignificantly affected by the supplementary radiationprovided by three wave lamp, sodium lamp, and red LEDswith different light intensities during the shorter day lengthunder greenhouse conditions. From this study, it wassuggested that the leaf growth and secondary metabolismof Kale seedlings can be controlled by supplementaryradiation using red LEDs of 1.2 μmol/m2/s PPF as well asthree wave or sodium lamps in the experiment.
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