| 21. | This sensitivity to day length is termed photoperiodism.
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| 22. | Natural molting is stimulated by shortening day lengths combined with stress ( of any kind ).
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| 23. | Lunar cycle, day length, and possibly chemical signalling.
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| 24. | When growth elongation is complete, day length is reduced to 8 hours using a blackout curtain.
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| 25. | Day length and temperature are the two triggers for color change and leaf loss, he said.
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| 26. | These onions are less fussy about day length and will reliably bulb in the North or South.
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| 27. | Spring leaf budding by the European beech is triggered by a combination of day length and temperature.
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| 28. | The winter moult is instigated not by a change in temperature but by a change in day length.
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| 29. | Breeding takes place when the water temperature falls to about and the day length is at its minimum.
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| 30. | Day length doesn't vary so much.
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