| 单词 | short-day |
| 释义 | > as lemmasshort-day short-day adj. (of a plant) not flowering until the period of light each day falls below some limit. ΘΚΠ the world > plants > by age or cycles > [adjective] > of opening or closing or activity or inactivity sleeping1757 vigilating1759 long-day1850 horologic1882 short-day1920 1920 W. W. Garner & H. A. Allard in Jrnl. Agric. Res. 18 559 It will be convenient to use the expressions ‘long day’ as meaning exposure to light for more than 12 hours and ‘short day’ as referring to an exposure of 12 hours or less. 1920 W. W. Garner & H. A. Allard in Jrnl. Agric. Res. 18 576 It [sc. Aster linearifolius] is a typical ‘short-day’ flowering perennial. 1947 Sci. News 4 129 By and large, short day plants flower if they receive 8–9 hours of light a day, and long day plants flower if they receive 14–16 hours of light a day. 1980 Sci. Amer. May 105 (caption) The cocklebier is a short-day plant and will flower only if it receives at least 8·5 hours of continuous total darkness each day. < as lemmas |
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