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Evaluating stresses within a cannabis plant using VPD (Vapor Pressure Deficit)

Submitted by Marijuana News on Thu, 10/27/2016 - 08:05

What is VPD?

Vapor Pressure Deficit (VPD) is the difference, or deficit, between the vapor pressure of water in the air versus vapor pressure of water in the leaf of a plant. Thus, VPD is a means of measuring potential water stress within a plant. It is a more accurate measurement than relative humidity (RH) because it accounts for the relationship of temperature and humidity. RH and VPD are typically inversely related, such that a low RH will mean a high VPD. That high VPD value means that a plant will feel a strong pressure to transpire significantly more water.

Why should I care about VPD?

While VPD is not a direct measurement of water flow or water loss, it’s an indicator of stress in the plant. The VPD value tells you how strongly a plant will feel the need to transpire.

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