photosynthetically active radiation (PAR)

[12.8.7.2]

The spectral range (waveband) of radiation, from 400 to 700 nm, which be definition photosynthetic organisms are able to use in the process of photosynthesis. The measure result of PAR can be reported as photosynthetic photon flux (PPF) or photosynthetic photon flux density (PPFD).

NOTE: This definition was changed in RP-16-17 Addendum 4. 

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