为了摸索气温与杂交水稻结实率关系,以确定晚稻的适宜播种期,争取高产,我所于一九七六、一九七七两年以南优组合为材料进行了试验观察。其结果是:杂交水稻结实率随着气温变化而波动,温度高结实率高,温度低结实率低(见表)。看来,在我们地区杂交水稻安全抽穗的气温指标下限定为25℃是较为适宜的。 In order to explore the relationship between the temperature and the seed setting rate of hybrid rice, in order to determine the appropriate sowing date of late rice and strive for high yield, I was in 1976, 1972 with Nan You combination as a test material. As a result, the seed setting rate of the hybrid rice fluctuated with the change of the temperature, the high seedling temperature was high, and the low seedling temperature was low (see the table). It seems that it is more appropriate to limit the temperature to 25 ℃ under the safe heading of hybrid rice in our region.