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长期以来我国北方粳稻扬花期低温危害的客观规律和指标还研究的不够成熟,故于1978—1979年利用长白山系的天佛指山的垂直气温梯度差异,进行这项研究工作。结果认为:1.水稻京引127品种开花时的适宜气温是22—32℃,下限温度是15.5℃;适宜相对湿度50—95%,相对湿度下限是40%。一日最高温度 Tm≥20.5℃是开花障碍日指标;平均最高温度 Tm≥26℃,随温度降低空壳率明显增加,其定量方程式为:Y=241.7-22.6T+9.8Tin 和 Y=249.4-10.9T(这两式用于日较差小的地区、季节);
For a long time, the objective laws and indicators of low temperature damage in the northern Japonica blooms in our country have not been studied yet. Therefore, this study was carried out by using the difference of vertical temperature gradient of the Tianfushi Mountain in Changbai Mountain between 1978 and 1979. The results showed that: 1. Suitable temperature for flowering of Jingyin 127 varieties was 22-32 ℃, the lower limit temperature was 15.5 ℃, the suitable relative humidity was 50-95% and the lower limit of relative humidity was 40%. The maximum daily temperature Tm≥20.5 ℃ is the daily flowering obstacle index; the average maximum temperature Tm≥26 ℃, with the temperature decreasing, the shell percentage increases obviously, the quantitative equation is Y = 241.7-22.6T + 9.8Tin and Y = 249.4- 10.9T (these two types are used for the area where the day is poor and the season).