Pair calibrated air temperature/RH with representative leaf-temperature measurements, PPFD, airflow, and plant-water context.
Visual lesson 06
Leaf temperature vs air temperature
Compare measured leaf and air temperatures and connect their difference to radiation, airflow, transpiration, humidity, and the vapor-pressure gradient at the leaf surface.
Plant-level vapor pressure
Interactive concept mapLeaf temperature changes the vapor-pressure gradient at the surface
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Measure room air
Air temperature and relative humidity describe the surrounding atmospheric condition.
Do not assume leaf temperature equals air temperature when using vapor-pressure concepts to interpret plant demand.
Knowledge check
PracticeCan you explain what the visual is showing?
When estimating plant-level vapor-pressure conditions, why is measured leaf temperature often more informative than assuming it equals air temperature?
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.Cannabis gas exchange, photosynthesis, transpiration, stomatal conductance, PPFD, temperature, and carbon-dioxide response under measured conditions.
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