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KMID : 0903620000410050459
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Journal of the Korean Society for Horticultural Science
2000 Volume.41 No. 5 p.459 ~ p.463
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Pridicting and Measuring Transpiration Based on Phytomonitoring of Tomato in Greenhouse
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우영회/Woo, Young Hoe
권영삼/조일환/남윤일/김형준/Kwon, Young Sam/Cho, Ill Hwan/Nam, Yooun Il/Kim, Hyung Jun
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Abstract
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The objective of this study was to develop model for accurate supply of water in greenhouse tomato and to carry out experimental verification. The developed transpiration model is calculated on the basis of greenhouse climate data (solar radiation, air temperature, relative humidity, vpd and lavpd) and phytomonitoring (sap flow, leaf temperature). Stomatal resistance of tomato leaves is significantly correlated to solar radiation. A simple exponential equation could be used to describe the relation between stomatal resistance and solar radiation as followed; Y=1039.25-4.34X+0.0058X² (Y: stomatal resistance sm^(-1), X: solar radiation W/㎡). Leaf boundary layer resistance was to assumed as a water temperature of evaporimeter and was parameterized by air temperature as followed; Y=8.548-1.44X+0.0557X² (Y: Leaf boundary layer resistance sm^(-1), X: air temperature ℃). The equation for stomatal resistance could explain more than 85% of solar radiation variation and the equation for leaf boundary layer resistance could explain more than 50% of air temperature variation. The calculated transpiration quantity showed good agreements with measured sap flow values in situations independent of which the continuances of the equation were estimated (R²=0.51^(**), R²=0.79^(**), R²=0.89^(**)). The present transpiration model was to predict transpiration with considerable accuracy in variable greenhouse climates.
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KEYWORD
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