| 21. | As it signals the beginning of the breeding season, photoperiod may often signal its end.
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| 22. | However, photoperiod only predicts overwintering in areas where day length effects the maturation of milkweeds.
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| 23. | Pinyon jays are stimulated by increased photoperiod length and begin breeding in January or early February.
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| 24. | Manipulating photoperiod can alter spawning time by over four months and is cheap and straightforward to achieve.
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| 25. | These behavioral photoperiod changes in male canaries are caused by changes in the song center of the brain.
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| 26. | Photoperiod and temperature treatments after grafting, however, had considerable effect on scion activity and total growth.
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| 27. | Is it photoperiod, age, temperature, a combination of these factors, or none of these?
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| 28. | Hormones such as BAP and paclobutrazol can also be used to completely arrest vertical growth in photoperiod plants.
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| 29. | Cannabis grown is induced into flowering by decreasing its photoperiod to at least 10 hours of darkness per day.
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| 30. | The length of the dormancy appears to depend on environmental factors, with the most likely zeitgeber being photoperiod.
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