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KMID : 0903619950360050641
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Journal of the Korean Society for Horticultural Science
1995 Volume.36 No. 5 p.641 ~ p.648
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Effect of Shade and Forcing Date on Growth and Flowering of Potted rhododendron obtusum
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송천영/Song, Cheon Young
송남현/신동기/유봉식/Song, Nam Hyun/Shin, Dong Gi/Yoo, Bong Sik
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Abstract
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Flower and growth responses of Rhododendron obtusum ´Red-1´, ´Purple-1´ and ´White-1´ as influenced by light shade and forcing date were investigated. The first flower initiation was observed in late June in three varieties. It took to form carpels for 28 days in ´Purple-1´, 35 days in ´Red-1´ and 46 days in ´White-1´ from flower initiation. According to decreasing shade level untill 60% of natural light, there were increased in growth, chlorophyll and stomatal aperture whereas the flower bud initiation was delayed two or three days. The buds of flowering of ´White-1´ were decreased about 70 % at 30% light shade, and 12% at 60% light shade, however, all the buds of ´Red-1´ and ´Purple-1´ were opened regaredless of light shade. The flowering forced on Nov. 30 was acclerated about 20 days in ´Red-1´, 14 days in ´Purple-1´ and 25 days in ´White-1´ as compared to forcing on Oct. 30. As light shade was increased, flowering was accelerated 3 or 5 days.
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