ISHS Acta Horticulturae 106: Symposium on Computers in Greenhouse Climate Control
COMPUTER CONTROL OF SHORT TERM PLANT GROWTH BY MONITORING LEAF TEMPERATURE |
| Author: | Y. Hashimoto |
| Abstract:
For the fundamental approach of computer control of greenhouse culture, controllability of short term plant growth is investigated in a computer controlled growth cabinet. Following the "speaking plant" approach, the possibilities are examined to use water content in the stem, which is identified by the electrical capacitance of the stem, and leaf temperature as indicators of short term plant growth. Air humidity controls water content in the stem and also leaf temperature when other environmental factors are constant. Digital control is investigated of water content in the stem and leaf temperature, by manipulating air humidity calculated from the on-line measurements of electrical capacitance and leaf temperature. It was found that the "speaking" plants were controlled stably by manipulating air humidity. It is noted that transpiration from stomata can be controlled by air humidity because of the relationship between leaf temperature and stomatal transpiration. | |
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