Lexic.us

¹ Source: wiktionary.com

Definition of Photoperiod

1. [n -S]

Medical Definition of Photoperiod

1. Recurring cycle of light and dark periods. The natural photoperiod is approximately 24 hours, and the ratio of light to dark hours slowly changes over the course of a year. In controlled experiments, the photoperiod is usually (but not necessarily) retained at 24 hours, and the light:dark ratio is typically constant. (09 Oct 1997)

Lexicographical Neighbors of Photoperiod

Literary usage of Photoperiod

Below you will find example usage of this term as found in modern and/or classical literature:

1. Molecular Markers in Plant Genome Analysis: Sponsored CRIS/ICAR Projects and by Andrew Kalinski (1995)
"Exotic cultivars will be used to develop germplasm which shows heterosis with US japonica cultivars. Cytoplasmic and photoperiod-sensitive genetic male ..."

2. Weather and Rice: Proceedings of the International Workshop on the Impact of by International Rice Research Institute (1987)
"The modeling method effectively reduces error over the temperature summation method by about 3 d for early or medium types with weak photoperiod sensitivity ..."

3. Forest and Conservation Nursery Associations: 1994 National Proceedings by Thomas D. Landis (1996)
"The mean height range between photoperiod and duration ... The general trend was for short photoperiod treatments to have greater GSD increments. ..."

4. Rice in Laos by J M Schiller, International Rice Research Institute (2006)
"Flowering of photoperiod-insensitive cultivars (into which category most improved ... However, photoperiod-sensitive cultivars that flower in mid-October ..."

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