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KMID : 1098420200280020111
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Korean Journal of Medicinal Crop Science
2020 Volume.28 No. 2 p.111 ~ p.118
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Effect of Shading Types and Duration on Alleviation of High Temperature Stress in Cnidium officinale Makino
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Nam Hyo-Hoon
Seo Young-Jin
Jang Won-Cheol
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Abstract
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Background: Cnidium officinale is a medicinal crop sensitive to high temperature. It is necessary to develop environment control technology that can reduce environmental stresses such as high temperature. This study was conducted to develop technology for stable production of Cnidium officinale by reducing damage owing to high temperature by applying shading treatment of varying duration, and structure.
Methods and Results: Black shading nets were used from May to September or November; shading structures such as pillar, flat roof, and tunnel type structures were installed. Environmental changes, rate of photosynthesis, and growth characteristics were investigated. The shading treatment reduced temperature by 3℃. The rate of photosynthesis and yield with shading treatment were higher by 134% and 127%, respectively, than those with full sunlight. The ratio of shading area ranged from 50% to 71% according to the type of shading structure. The effect of environmental control on growth varied depending on the type of shading structure.
Conclusions: The shading treatment reduced damage owing to high temperature, shading rate of 55% - 75% was recorded between the period May - September, and the flat roof type shading structure was considered the most suitable among shading methods.
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KEYWORD
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Cnidium officinale, Heat Stress, Photosynthesis, Shading
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