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菊花是典型的短日照植物。在日照时间超过13个小时的长日照环境下,绝大多数品系只能进行营养生长而不能分化花芽。因此,许多优良的大菊系品种都是从10月下旬至11月上旬才陆续开花的。在南方,要想让它提前开花,应进行短日照处理。方法是利用暗室或双层黑布罩子每天给菊花遮光14小时,见光10小时。至于应当提前多少天来进行短日照处理,则因品种不同而不同。专家们就此问题曾做过反复实验,现将有关数据分述如下,其它品种可参照进行。
Chrysanthemum is a typical short-day plant. Under the long-day sunshine duration of more than 13 hours, the vast majority of lines can only grow vegetatively and can not differentiate flower buds. Therefore, many fine varieties of big daisy are blooming from late October to early November. In the south, if it is to bloom in advance, short-day treatment should be carried out. Method is to use darkroom or double black cloth cover daisy every day for 14 hours, see light for 10 hours. As for how many days in advance should be short-day treatment, then the different varieties. Experts have done repeated experiments on this issue, the relevant data are as follows, other varieties can be referred to.