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KMID : 0903619790200010066
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Journal of the Korean Society for Horticultural Science
1979 Volume.20 No. 1 p.66 ~ p.71
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Effects of Different Moisture Content of Cutting Medium in the Closed Moist Room on the Rooting of Rhododendron catawbiense ´ Bosursault , and Cupressocyparis leylandii
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Lee Chung-Sik
Perkwin, F.W.
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Abstract
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In order to know the most suitable water content condition of a cutting medium of the closed moist room using the polyethlene covered for Rhododendron catawbiense ´Bosursault´ and for Cupressocyparis leylandii the present experiments were carried out. The results obtained are summarized as follows.
a. The disease occurrence.
With 100% moisture content in the medium (field capacity) the fungus infection was severe at most and accordingly decreasing this water level in the medium caused occurrence of disease to diminish. This tendency was similar for both plants.
b. The callus formation.
The less water in the medium the more callus was formed the cuttings. The water level of 20% in the medium of Cupressocyparis leylandii was nearly lethal for the cuttings; no callus formation or rooting was obtained.
c. The rooting percentages.
For Rhododendron catawbiense ´Bosursault´, in a medium of only brown peat the amount of 100 water in the medium was the best. Considering the disease occurrence, the 60 and 80% water content might be better. For Cupressocyparis leylandii cuttings when placed on a mixed medium of four parts of peat and one part of sand by volume the 40% amount of water content was best. The suitable condition of the level in the medium might be in the range from 40 to 60%.
d. The changes in the mixed medium of water content.
The 100% amount of water in this medium had decreased to 49.3% 32 days after the cutting date. The amount gradually decreased during longer periods of time as described table 5. This seems to be caused not only by the temperatures in the greenhouse, but also the physiological stage of the cuttings development. In the case of many newly formed roots the decrease of the water content is very important.
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