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榆杂２９双亲的一般始花时间，南２９（偏籼型）１０∶１０～１１∶４０、滇榆１号Ａ（偏粳型）１２∶３０～１４∶００。榆杂２９繁殖制种双亲的花时受环境条件尤其是开花期天气情况影响明显。制种中，遇气温较高（日平均温度２５℃左右）而湿度较低（空气相对湿度＜７５％）的晴天时南２９花时明显提前；日均气温升高有利于滇榆１号Ａ花时提前，但昼夜温差较大（＞１０℃）时滇榆１号Ａ花时表现推迟；天气变化导致父母本花时差加大（盛花时花时差达２．０ｈ以上）是制种急需解决的问题；喷施调花灵对调整制种父母本花时差有一定效果。繁殖中，遇气温和湿度均较高的天气时不育系会出现两段开花的现象，应采取措施调整赶粉时间和次数以提高花粉利用率和异交结实率。
Elm 29 parents generally spend time, South 29 (Indica) 10:10 ~ 11:40, Yunnan Yu 1 A (partial japonica) 12:30 ~ 14:00. Elm 29 breed breeding parents of flowers by the environmental conditions, especially the flowering weather conditions are obvious. Seed production, the case of high temperature (average daily temperature of about 25 ℃) and the humidity is low (air relative humidity <75%) when the sunny days 29 significantly ahead of time; average daily temperature is conducive to Yunnan Yu 1 A When the temperature difference between day and night is larger (> 10 ℃), the performance of flower Dian Yu 1 is delayed. The weather changes lead to the increase of the parental flowering time (when the flowering time is more than 2.0h), seed production is urgently needed The problem of sprinkling spruce has some effect on adjusting the flowering time of spawning parents. Breeding, the case of high temperature and humidity in the male sterile line will appear two flowering phenomenon, measures should be taken to adjust the time and frequency of powder to improve pollen utilization and outcrossing rate.