Cannabis responses to contrasting daily light integrals and short-term PPFD, including photosynthetic acclimation and water-use responses; supports separating DLI from instantaneous PPFD.
Visual lesson 08
PPFD, DLI & photoperiod
Separate instantaneous photon flux density, daily integrated photon dose, and daylength or nightlength signaling so a plant can receive similar daily light totals under different temporal patterns that are not biologically identical.
System study map
PPFD, DLI & photoperiod
PPFD versus DLI versus photoperiod comparison dashboardStart with the highlighted plant system as the anatomical context. Then compare the lesson observations with the evidence sources and knowledge check below so structure, process, and whole-plant consequences stay connected.- Plant system
- Environment Overlay
- Lesson focus
- PPFD versus DLI versus photoperiod comparison dashboard
- Study mode
- Whole-plant context
Knowledge check
PracticeCan you explain what the visual is showing?
Which statement correctly separates PPFD, DLI, and photoperiod?
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 leaf gas exchange under varying PPFD, temperature, and CO2; supports coupled response teaching while keeping experimental genotype and chamber conditions explicit.
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