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Vapour Pressure Deficit (VPD) is a metric most growers either don't know or don't care to monitor, foolishly.
Simply put, VPD is the measurement of pressure in the atmosphere, which is measured and altered by temperature and humidity.
Knowing your VPD will let you know how your plants are going to respond to the atmospheric pressure and allow you to prepare accordingly.
The VPD in the grow room will determine how your plants transpire. This directly relates to your plants ability to consume nutrients and water.
If your VPD is too high or low, your plants will be over or under transpiring, leading to massive problems nutritional problems if you are not prepared or aware of how to deal with the situation.
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