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3R Lighting Tutorial: Humidity and Plants





Q: In Hydroponics, how low can you make the humidity and still speed up growth to the maximum?
A: You know, there is a graduate student at a large Agricultural University somewhere in the Midwest or maybe in Cali. He's haunting the college, drinking too much beer, racking his brain for a topic on which to base his dissertation.
You can see him hanging out at the local coffee shop with his yellow pad, frustrated, furiously scribbling anything for show. If he had not alienated all his friends by being so self-absorbed, one of them would have directed him to this website by now--and then we could all know the answer.

Q: What other new research is going on?
A: The new research is on "water vapor pressure deficit"

An easy way to get a handle on this one is to look at the current temperature and to compare it to the dewpoint.
A high VPD is dry, while a low VPD is wet.































© 2002-2004 K.Kelly