Water vapour pressure deficit for optimum transpiration
VPD measures the water vapour absorption capacity of the air in kPa. Calculated from temperature and humidity. Optimum VPD: Vegetative 0.4-0.8 kPa, flowering 0.8-1.2 kPa. Too low: Fungal risk, low transpiration. Too high: stress, nutrient problems. Use VPD-Calculator for precise environmental control.
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