Abstract
Humidity controls leaf temperature when other environmental factors are constant. Digital control of leaf temperature by manipulating air humidity, calculated from the on-line data of leaf temperature, was investigated. Leaf temperature of the sunflower (Helianthus annuus cv. Large Russian) was kept stable by manipulating a humidity of less than 10% RH. Dynamic characteristics of leaf temperature involved in the control of humidity are shown to be valid characteristics based on simulation of the plant model as reported in our previous papers. A humidity of more than 20% RH caused a distinct difference in the dynamic characteristics of leaf temperature between the experiment and simulation. Modification of the non-linear, stomatal aperture was reasonable.
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