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Parameter Tree:
EARTH SCIENCE > BIOSPHERE > VEGETATION > PHOTOSYNTHETICALLY ACTIVE RADIATION
Definition:
Photosynthetically Active Radiation is the light in the whole wavelength
band from 400 nm (deep violet) to 700 nm (dark red) used by plants
in photosynthesis.  
Reference:
Open University. 1989. Seawater: Its Composition, Properties and Behavior.
Pergamon Press. England.
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