IEVref:845-06-27ID:
Language:enStatus: Obsolete
Term: photoperiod
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Definition: natural or artificial cycle of light and darkness alternation to which living organisms may be exposed

NOTE – For instance, for the natural cycle of light at the time of the equinoxes, the ratio of light duration (L = 12 h) to darkness duration (D = 12 h) is expressed as LD 12 :12.


Publication date:1987
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