PAR(κ΄ν©μ± μ ν¨ λ³΅μ¬)μ μλ¬Όμ΄ κ΄ν©μ±μ μ¬μ©ν μ μλ λΉμ νμ₯ λ²μ(400 nm(보λΌμ) ~ 700 nm(λΉ¨κ°μ))μ λλ€. PARμ μΈ‘μ λ¨μκ° μλλΌ μ μλ μ€ννΈλΌ λ²μμ λλ€. νλ©΄μμμ PAR λΉμ κ°λλ PPFD(Β΅mol/mΒ²/s)λ‘ μΈ‘μ λ©λλ€. PARμ μ΄ν΄νλ κ²μ μλ¬Ό μμ₯λ±μ νκ°νλ λ° κΈ°λ³Έμ μ λλ€. PAR λ²μ λ°μ λΉ(UV, μμ μΈμ , μ μΈμ )μ κ΄ν©μ±μ κ°μ λ°©μμΌλ‘ μ¬μ©λμ§ μκΈ° λλ¬Έμ λλ€.
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- PAR range: 400β700 nm β visible light that drives photosynthesis
- Blue light (400β500 nm): promotes compact vegetative growth and chlorophyll synthesis
- Red light (600β700 nm): drives photosynthesis most efficiently; promotes flowering
- Green light (500β600 nm): partially absorbed by plants; penetrates deeper into canopy
- Far-red (700β800 nm): not classic PAR, but triggers shade avoidance and the Emerson effect
- Lux and lumens measure light as perceived by the human eye β irrelevant for plant growth