As a plant’s water source dries out, small bubbles form in the xylem — the hollow strands that carry water from the soil to the leaves of vascular plants.
The recording was made 30 years ago by Dr Kim Ritman, using a very low-fi phone receiver with a pin soldered onto it to amplify the sound.
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“In general, our hypothesis that larger conduits produced lower frequency signals and smaller units at the ultrasonic frequencies was supported”, he writes in his study Acoustic Emissions from Plants: Ultrasonic and Audible Compared.