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徐州单志超同志: 您的来信收到,你问到:所养的几十盆菊花在立秋后十天之内摘心,十月初仍不见花蕾,考虑到距养菊处7米有一250W之高压水银灯,是否由于灯光之照射(菊花为短日照植物)而延缓了花蕾之形成。依来函所谈情况,我觉你的菊花不能按时开花,可能是因为摘心太晚了。每年立秋大约都是在八月十日左右,你最后一次摘心是在“立秋后十天之内”即使折中计算,也要到八月十五日了。而菊花的花芽在八月下旬,也就是当自然光照射十三小时左右时便开始分化,九月中花蕾逐渐形成(这一点。全国各地无大差异),你正是在花芽分化之
Comrade Xu Zhizhi Zhizhao: Your letter has been received: You asked: dozens of pot chrysanthemums are raised in the ten days after the establishment of the topping in ten days, still no buds appeared in early October, taking into account that there is a high pressure of 250W Mercury lamps, whether due to the lighting of light (chrysanthemum for the short-day plants) and delay the formation of buds. According to the communication, I think your chrysanthemum can not flow on time, probably because the topping is too late. Every autumn is about August 10, and your last topping is in the “ten days after the fall of autumn,” even if it is compromised, it will reach August 15. The flower buds of chrysanthemums began to differentiate in late August, that is, when natural light shone for about 13 hours, and flower buds gradually formed in September (this is no big difference across the country)