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水稻在通常自然条件下,即使给予10小时短日照处理,植株光照阶段发育亦需在夜温达到20℃以上时才能顺利进行。水稻需要达到一定叶龄期(叶数)以后才能接受短日照而进行光照阶段发育,对同一品种来说,这种适当的叶龄期是较稳定的,但不同的播种期、栽培条件下达到此叶龄期的苗龄(播种后天数)则有明显差別。水稻达到一定叶龄期以后,分蘖存在与否,叶片多少均不明显影响进行光照阶段的速度;叶鞘亦有接受短日照完成光照阶段的作用,但抽穗很迟。本文还讨论了秈、稉稻光照阶段发育特性的不同问题。
Under normal natural conditions, even if 10-day short-day treatment is given to rice, the development of the light stage of the plants needs to be carried out smoothly when the night temperature reaches 20 ° C or above. Rice needs to reach a certain leaf age (leaf number) to accept the short-day light and light stage development, for the same species, the appropriate leaf age is more stable, but at different sowing dates, cultivation conditions This leaf age seedling age (days after sowing) there are significant differences. Rice reached a certain leaf age, the presence or absence of tillers, the number of leaves did not significantly affect the speed of the light stage; leaf sheath also accept the short sunshine stage to complete the role of illumination, but heading is late. This article also discussed the different developmental characteristics of indica and japonica rice at different stages.