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本文研究了处理时间、株龄、日长递减率、光照和夜温对一些难开花和不开花亲本（Ｂａｄｉｌａ、粤糖５７／４２３、粤糖５９／６５、Ｃｏ４１９、华南５６／１２和华南５６／２１）的抽穗率和抽穗期的影响。结果表明：（１）提前处理对粤糖５９／６５有负作用；（２）较慢的日长递减率（１５秒／天）可提高粤糖５７／４２３、粤糖５９／６５和Ｂａｄｉｌａ的抽穗率；（３）充足的自然光照可提高所有参试６个品种的抽穗率；（４）在暗期初始阶段，过高的夜温可能会对整个暗期产生非常有害的影响。
In this paper, we studied the effects of treatment time, plant age, decreasing rate of day length, light and night temperature on some difficult to flowering and non-flowering parents (Badila, Guangdong sugar 57/423, Guangdong sugar 59/65, Co419, South China 56/12 and South China 56 / 21) of the heading rate and heading time. The results showed that: (1) pretreatment had a negative effect on Yueshi 59/65; (2) the slower decline rate of YEN (15 seconds / day) increased YUE 57/423, YUE 59/65 and Badila (3) Adequate natural lighting can increase the heading rate of all 6 cultivars tested; (4) In the early dark phase, excessive night temperature may have a detrimental effect on the whole dark period.