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VPD

Pronounced / vee·pee·DEE /

Vapor pressure deficit: the difference between how much moisture the air holds and how much it could hold when saturated, which affects how fast plants transpire.

Example in a sentence

“She raised the temperature slightly to bring VPD into range.”

Also called vapor pressure deficit, vapour pressure deficit

Grow guide Temperature, humidity and VPD made simple Aim for warm, steady temperatures, higher humidity for seedlings, and lower humidity as buds fill out. VPD combines temperature and humidity into…