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Effect of Supplemental lighting on the Growth and Flowering of Rosa hybrida 'Nobles' in winter  

Na, Taek-Sang (Horticultural Research Division, Jeollanamdo Agricultural Research and Extension Service)
Kim, Jeung-Gun (Horticultural Research Division, Jeollanamdo Agricultural Research and Extension Service)
Choi, Kyong-Ju (Horticultural Research Division, Jeollanamdo Agricultural Research and Extension Service)
Gi, Gwang-Yeon (Horticultural Research Division, Jeollanamdo Agricultural Research and Extension Service)
Yoo, Yong-Kweon (Division of Bioscience, Mokpo Nat'l Univ.)
Publication Information
Journal of Bio-Environment Control / v.16, no.2, 2007 , pp. 130-134 More about this Journal
Abstract
This study was carry out to investigate the effect of supplemental lighting on the growth and flowering of Rosa hybrida 'Nobles' in winter. Supplemental lighting was treated during 5 hours at night with sodium lamp and fluorescent lamp, and cut flowers harvested 2 times for the experimental period. After supplemental lighting, air temperature and slab temperature in glasshouse was higher in sodium lamp treatment than control. Realtive humidity was low in sodium lamp treatment. Total nitrogen phosphate, potassium, calcium, and magnesium contents of stem in sodium lamp treatment were higher compare to the other treatment. In sodium lamp treatment, the potassium and magnesium content of leaf in control were lower than the others. Chlorophyll content was not different by source of lighting. Stem length and diameter was longer in sodium lamp treatment. In two times, the yield was highest in sodium lamp treatment. Therefore, supplemental lighting with sodium lamp in winter season was recommended for improving the yield and quality in cut rose 'Nobles'.
Keywords
fluorescent lamp; rose; sodium lamp; supplemental lighting;
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