Vapor Pressure Deficit
Humidity vs. VPD
NO! Humidity is not the same as VPD!
Humidity is the measurement of how much moisture is currently in the air. While humidity is a part of the growing equation, VPD (vapor pressure deficit) is the measure of how much remaining moisture the air can hold. This is important to understand, as it allows for us to determine the best temperature and humidity for the grow room!
Curious how you can calculate VPD? Well, thanks to a Swedish scientist named Svante Arrhenius, we can. He created the Arrhenius equation to do so. For the sake of time and lack of mathematical understanding, I use a calculator like this online. There are also several great charts online, like this.
Now we know what VPD is and how we can calculate it. The important question now is how we measure and control it. Thanks to companies like TC Control Group, who install sensors, you can accuracy measure and store humidity/VPD trends. In fact, the software and hardware that TC Control Group provide can make any necessary changes to the environment via communication with the room's HVAC and lighting equipment. By understanding and creating the correct environment for your crops, you will end up with larger, healthier yields. Choosing to automate your grow reduces risk and ensures consistent outcomes.
So, go check out your crops ideal growing conditions and create the right environment!
If you want to learn more about creating the ideal environment, contact TC Control Group, we would be happy to talk with you.
