VAPOR PRESSURE DEFICIT FOR CANNABIS GROWS

BIGGER PLANTS, HEALTHIER PLANTS

Controlling Vapor Pressure Deficit Maximizes Nutrient Uptake

Understand the Plant and VPD

Building designers can design almost any building to meet design specifications, but when you add in living plants, the building dynamics change considerably. Understanding how plants operate and interact with their environment is key to designing a high-performance facility.

Vapor Pressure Deficit (VPD) measurements are an indicator that can help identify the potential for plant transpiration and controlling the VPD can maximize transpiration, which in turn, maximizes the plants’ nutrient uptake and yields bigger, healthier plants.

VPD is a single indicator that considers the room’s environmental conditions at certain times during the growing process. Early, middle, and late-stage cultivation can have varying VPD control or set points.
Vapor Pressure Deficit

Growth Stages and Relative Humidity vs Temperature and Vapor Pressure Deficit

    • VPD identifies the potential for plant transpiration.
    • The relationship between VPD, room set-points and equipment cost is typically exponential.
    • The goal? Find a set-point where the mechanical equipment operates at the highest efficiency while maintaining the proper VPD and environmental control.