植物の茎頂部クチクラ抵抗測定法の開発

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  • Development for Measuring Method for Cuticle Resistance of Plant Shoot Tip.
  • ショクブツ ノ ケイチョウブ クチクラ テイコウ ソクテイホウ ノ カイハツ

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Shoot tip temperature is one of the important factors to affect morphological development of plants. Energy budget equation can be applied to estimate the shoot tip temperature and cuticle resistance of plant shoot tip is essential to calculate the energy budget. <BR>A method for measuring cuticle resistance of a plant shoot tip was newly developed. The theoretical equation to calculate the cuticle resistance was derived from the energy budget equation, which is consisted of radiation, convection and transpiration. The derived equation is the function of drybulb temperature, wetbulb temperature, glazing material temperature, air velocity, and the relation between vapor pressure deficit and difference between drybulb and shoot tip temperature. The drybulb, wetbulb, glazing material temperatures and air velocity can be directly measured, and the relation between vapor pressure deficit and difference between drybulb and shoot tip temperature is experimentally determined. <BR>The experiment was conducted to obtain the directly measured values and determine the relation mentioned above using Poinsettia crops in a greenhouse. <BR>The procedure of the experiment was that the vapor pressure deficit of the greenhouse was changed with maintaining the drybulb temperature. These values and relation were put into the developed equation and then the cuticle resistance of Poinsettia shoot tip was calculated approximately 960 s/m.

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