How the Sunlight Effects Plant Growth

  • 200 – 280 nm UVC ultraviolet range which is extremely harmful to plants because it is highly toxic.
  • 280 – 315 nm Includes harmful UVB ultraviolet light which causes plants colors to fade.
  • 315 – 380 nm Range of UVA ultraviolet light which is neither harmful nor beneficial to plant growth.
  • 380 – 400 nm Start of visible light spectrum. Process of chlorophyll absorption begins. UV protected plastics ideally block out any light below this range.
  • 400 – 520 nm This range includes violet, blue, and green bands. Peak absorption by chlorophyll occurs, and a strong influence on photosynthesis. (promotes vegetative growth)
  • 520 – 610 nm This range includes the green, yellow, and orange bands and has less absorption by pigments.
  • 610 – 720 nm This is the red band. Large amount of absorption by chlorophyll occurs, and most significant influence on photosynthesis. (promotes flowering and budding)
  • 720 – 1000 nm There is little absorption by chlorophyll here. Flowering and germination is influenced. At the high end of the band is infrared, which is heat.
  • 1000+ nm

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