VPD Bioengineering Chart
Mar 17 2021
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An Introduction to Vapor Pressure Deficit

View Our Greenhouses How well do you understand temperature and relative humidity? By Harry Connor Vapor Pressure Deficit (VPD) is used by growers to assess how dry the air is at a given moment. If the air is too dry, photosynthesis will stop in order to protect the plant from exhaustion.  Photosynthesis is the process…
VPD chart- cannabis
Jul 10 2019
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The Importance of Measuring Vapor Pressure Deficit

What is Vapor Pressure Deficit? Vapor Pressure Deficit (VPD) is a pressure value that combines both temperature and relative humidity(RH). VPD allows growers to understand stress in their plants. It is a measure of the evaporation potential, or the difference in “wetness” (the amount of water vapor), of the air at the leaf versus the…