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It seems like VPD is a calculation of a lot of things that are not related directly to the plant, but to the environment. And then another step for context, adjusting for the difference between room temp and plant leaf temp. But the variable part seems to me the charts that say "here is the...

Howdy everyone. I've been lurking here a long time, and only recently finally registered. I've read a ton of threads with differing opinions (so, my mind boggles), and along the way have come up with a few questions that weren't addressed, found in topics I liked. Anybody who might elaborate...