Cannabis gas exchange, photosynthesis, transpiration, stomatal conductance, PPFD, temperature, and carbon-dioxide response under measured conditions.
Visual lesson 03
VPD & transpiration
Connect vapor pressure deficit to stomatal behavior, leaf temperature, water movement, and changing plant demand.
Interactive academic visual
VPD & transpiration
Temperature and vapor pressure shape atmospheric demand on the leafLeaf vapor pressure
Water vapor inside healthy leaf air spaces is typically near saturation at leaf temperature.
Knowledge check
PracticeCan you explain what the visual is showing?
What does VPD help describe?
Track this lesson
Mark the lesson complete when you are comfortable with the visual, observations, and system context.
Evidence & further reading
Sources connected to this lesson
These references support specific biological, diagnostic, environmental, or process concepts used in this lesson. They are not a substitute for crop-specific testing or local regulatory guidance.Vapor-pressure-deficit sensing and stomatal response mechanisms in vascular plants, including hydraulic and ABA-mediated regulation.
Cannabis photosynthetic and stomatal responses to water deficit, genotype-dependent drought response, biomass partitioning, and physiological interpretation under measured conditions.
System context