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各种植物评花时光照时间K短的反应是不向的，这种现象称为周期现象，它是植物在长期的系统没有过程巾形成的一种特性。、按照作物好花对光峪长短的不同要求，可将作物分为短日照、长日照和中性作物。短日照作物是指只有在白昼较短、日照时间少于某一时数（一般为12～14小时）以
A variety of plant assessment of light time K light short reaction is not, this phenomenon is called the periodic phenomenon, it is the plant in the long-term system is not a feature of the process of towel formation. , According to the different requirements of the crop good flowers on the length of the valley, can be divided into short-day crops, long sunshine and neutral crops. Short-day crop refers only to the shorter day, sunshine time less than a certain number of hours (usually 12 to 14 hours) to