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Well just in case this ends up being a solution to some mystery I've not come across, here's a genuine (albeit seemingly pointless) finding from a research project I did a while back:
When saltwater is poured into the soil around the roots of a tomato plant, the plant's internal electrochemical response oscillates with a 0.1hz frequency.
I'm not sure what mystery that will solve but now nobody can accuse me of not reporting/recording it!
So this is related to hydration in the plants. I read this paper about tomato plants being stressed and emitting ultrasonic chirps
https://www.nhm.ac.uk/discover/news/2023/april/plants-emit-ultrasonic-popping-sounds-when-stressed.html
Ooh, interesting. That's a different angle from what we were working on but a similar idea of being able to understand what stresses plants are under.
Here's an article talking about the project I contributed to: https://www.engineering.com/story/xzezv