Vapour pressure-deficit, or VPD, is the difference (deficit) between the amount of moisture in the air and how much moisture the air can hold when it is saturated. Once air becomes saturated, water will condense to form clouds, dew or films of water over leaves.

Vapor Pressure Deficit is the difference between the Saturated Vapor Pressure (SVP) and Relative Humidity. Saturated Vapor Pressure is the maximum amount of moisture the atmosphere can hold according to it’s temperature. And Relative Humidity is the amount of moisture currently suspended in the air.

Dec 11, 2018 · VPD helps you identify the correct range of temperature and humidity to aim for in your grow space and plan accordingly. With VPD you can achieve the best results while avoiding pest and environmental problems.

Feb 12, 2020 · VPD helps you identify the correct range of temperature and humidity to aim for in your grow space. With VPD you can achieve the best results while avoiding pest and environmental problems. VPD also controls plant transpiration rates, stomata opening, CO2 uptake, nutrient uptake, and plant stress.

Jul 15, 2022 · So now you know what VPD is, how it impacts plants, and how you can change VPD. All that’s left is to figure out how to use this information in your own grow. Ideal VPD, as a general rule for plant growth, is around 0.8 – 1.2 kPa (kilopascals).

Nov 13, 2024 · VPD indicates the air’s moisture saturation level. Lower moisture in the air allows more plant transpiration, while higher saturation reduces it. In this post, we’ll explore how VPD works, its impact on plant functions, factors affecting VPD, and how growers can manage it.

Apr 25, 2023 · The target VPD range considered optimal for thriving cannabis cultivation typically falls between 0.8 to 1.2 kilopascals (kPa). Keeping VPD within this sweet spot helps facilitate the plant’s efficient uptake of both water and essential nutrients.

May 22, 2017 · In order to get a VPD around 0.80 we need the actual vapor pressure of the room environment (AVP) to be approximately 1.71 kPa. At 75°F that requires a relative humidity of 57%. This 75/57 combination provides a VPD value very close to the 0.80 target value.

VPD helps you identify the correct range of temperature and humidity to aim for in your grow space. With VPD you can achieve the best results while avoiding pest and environmental problems. VPD also controls plant transpiration rates, stomata opening, CO2 uptake, nutrient uptake, and plant stress.

Oct 19, 2016 · Vapor Pressure Deficit (VPD) is an indicator of the evaporation potential of water to the air. It’s a measurement that’s defined as the difference, or deficit, between pressure exerted by the moisture present in the air currently and the pressure at saturation.