Process Identification and Optimal Control of Plant Growth. (III):Dynamic Characteristics of Leaf Temperature as Affected by Step Input of Environmental Elements

概要

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Leaf temperature measured by infrared thermometer was studied. Identification of water content in plants by step input of environmental elements was performed by using the information of leaf temperature in addition to the information of electric capacitance. In the condition of low humidity (for example 50% RH), oscillation in leaf temperature occurred by light input in tobacco plant unlike cucumber. The cycling pattern of tobacco leaf temperature was the second order lag of S (Laplace transform) and the equivalent time constant was faster in lower relative humidity and in higher temperature. On the other hand, the response of cucumber leaf temperature was the first order lag of S. Information of leaf temperature as well as information of water content in plants by means of electric capacitance method could be utilized for monitoring control of plant growth and be indispensable for the optimal control of plant growth.
日本生物環境工学会の論文