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KMID : 0903619960370010106
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Journal of the Korean Society for Horticultural Science
1996 Volume.37 No. 1 p.106 ~ p.111
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Effects of shading and Root - cut Treatments on winter Injury and Water Relations in Rhododendron obtusum cv . Hinodegiri
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Abstract
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In order to elucidate physiological factors involved in causing the winter injuries of 2 to 3 years old evergreen Japanese rhododendron (Rhododendron obtusum cv. Hinodegiri) and possible preventive measures against the disorder, the present studies were conducted with experimental treatments of root-cut or plant-shading. While the survival rate of shoots after the winter season showed 67% as the control without any experimental treatment, more than 94% survival was found with the plant shading implemented in February. Although all of shoots died after root-cut treatment, the shading in February resulted in 33% survival. Water potential of the shoots after winter season showed about -2.8㎫ without shading but it increased to -1.8㎫ with shading. Water content of shoots was 6% more with shading in February than that of the control. The change in physiological vitality and contents of carbohydrates, chlorophyll, protein and peroxidase activity during the winter season showed that the winter injury commonly occurred in the early spring on Rhododendron obtusum cv. Hinodegiri in central Korea region, is largely caused by water deficit, and could be effectively prevented by shading them from the time of February on.
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