Vapour Pressure Deficit (VPD): A Key Indicator of Air Dryness and Its Impact on Crop Water Stress

The vapour pressure deficit (VPD) is a measure of air dryness that reflects the amount of moisture present in the air and its capacity to hold moisture when saturated. Extreme temperatures can have a direct impact on crop tissue, resulting in reduced yield potential. Furthermore, they can also lead to moisture stress by increasing the VPD.