SHERP

Application of Extended Lighting Cycles to Promote Vegetative Growth of Vegetables Grown in Closed Plant Production Systems
폐쇄형 식물생산 시스템에서의 채소 생장 향상을 위한 extended lighting cycle의 적용

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Authors
구종현
Advisor
전창후
Major
농업생명과학대학 원예학과
Issue Date
2012
Publisher
서울대학교 대학원
Keywords
Extended lighting cycle
Description
학위논문 (석사)-- 서울대학교 대학원 : 원예학과, 2012. 8. 전창후.
Abstract
In the present study, extended lighting cycle (ELC), a novel lighting pattern was proposed for the production of vegetables in closed plant production systems where artificial lights were adapted as a sole lighting source. The effects of ELC including continuous lighting (CL) on growth of head lettuces, leaf lettuces, Chinese cabbages, pak-chois, hot peppers and tomatoes were examined in the first chapter of this dissertation. When they were grown under various lighting cycle conditions
CL, 16, 24, and 32-h photoperiods combined with an 8-h dark period, and 20, 30 and 40-h photoperiods combined with a 10-h dark period, plant growth and light use efficiency (LUE) increased as the ratio of photoperiod to lighting cycle increased at the earlier growth stage. After that, the greater ratio of photoperiod to lighting cycle, the earlier growth inhibition occurred except head lettuces. In tomatoes growth retardation and chlorosis occurred within 14 days after sowing (DAS) in treatment CL. Those symptoms were found in other ELC treatments and they occurred earlier and more seriously as the ratio of photoperiod to lighting cycle increased. Occurrence time and the severity of those symptoms were varied by plant species, too. Tomatoes were most susceptible to ELC-related symptoms among the six tested vegetable, followed by hot peppers, pak-chois, Chinese cabbages, leaf lettuces, and head lettuces. In head lettuces those symptoms were not found until the end of experiment (28 DAS). In the second chapter, the effect of insertion of dark period in the middle of continuous lighting to avoid growth inhibition caused by continuous lighting in tomatoes was examined. Tomato seedlings were grown under various lighting scenarios
four different insertion timings of dark period (changed from CL to 16/8-h lighting cycle at 6, 8, 10, and 12 DAS) and six different lengths of dark period inserted (8, 16, 24, 32, 40, and 48-h) after 10 days of CL. Growth inhibition caused by CL was avoided by insertion of dark period in the middle of CL. The growth of tomatoes was greatest when the lighting cycle condition was changed from CL to 16/8-h at 6 DAS, and the effectiveness of avoidance decreased as the insertion time of dark period were delayed. The effectiveness of the avoidance did not change, however, as the duration of dark periods inserted was prolonged from 8 up to 48 h. The results of this study imply that ELC or CL with insertion of dark period can be applied for rapid and efficient production of leafy and fruit vegetables and/or their transplants production in closed plant production systems using artificial lights.
Language
English
URI
http://hdl.handle.net/10371/125665
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College of Agriculture and Life Sciences (농업생명과학대학)Dept. of Plant Science (식물생산과학부)Theses (Master's Degree_식물생산과학부)
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