Abstract
These studies were carried out for the development of non-invasive and continuous measurements of the variations of water content in the living plant tissue. The purposes are to measure plant physiological informations, to apply the methods to the estimation of physiological effects of water to the plant growth in agriculture and to analyze the effects of air pollutants to the plants.
The following measurements were developed as the results of these studies.
(1) Measurement of variations of stem diameter
(2) Measurement of variations electrostatic capacity of plant stem
(3) Measurement of variations of leaf thickness
The feasibility studies were done mainly in the growth chamber and the greenhouse, and these measurements were found useful. Especially, the measurement of stem diameter variation was useful even in the field.
