Relationship between plant Bioelectrical Potential and Water consumption environment

The objective of this study is clarification of the relationship between plant bioelectrical potential and water consumption environment, including transpiration, irrigation, and water stress. Experiments are conducted to clarify the relationship; to extract the plant bioelectrical potential, spectral analysis is introduced. The result indicates that when the transpiration rate is high, the power spectrum is broader. The experimental result indicates that plant bioelectrical potential fluctuates after several seconds of irrigation. To clarify the difference between the plant bioelectrical potential before and after irrigation, the power spectra before and after irrigation are estimated. The results indicate that power after irrigation is higher than power before irrigation. After irrigation, the power spectrum from 0.01 Hz to 0.2 Hz is predominant. To extract the plant bioelectrical potential under water stress and non-stress conditions, the power spectrum analysis is conducted. The results indicate that the power spectrum under the non-stress condition is relatively stable and amplitude is small. On the other hand, the amplitude of the power spectrum is relatively large, and the power spectrum from 0.05 Hz to 0.15 Hz is predominant under water stress condition. The power spectrum analysis clarified the difference. The plant reaction to the change of the water consumption environment can be evaluated using the plant bioelectrical potential.