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本文通过不同熟期类型粳稻品种的播期研究,发现粳稻品种的感温性强,中粳中晚熟品种的感温级别达8—9级;但不同品种对适温的要求不同,表现为不同温度条件下的抽穗促进率有差异,中粳中熟品种要求的适温较高,早粳早熟、中粳中、晚熟品种要求的适温较低,受低温的影响小。通过分析温室内8个不同播期的抽穗日数与各温度因子间的关系,表明提高日均气温,降低有效积温是缩短抽穗日数的有效途径,但日均温不能过大或过小,日最高温的天数不应大少。
In this paper, the sowing date of japonica rice varieties with different maturity dates showed that the sensible temperature of japonica rice varieties is strong, and the middle-late japonica rice varieties have the grade of 8-9. However, the different varieties have different requirements on suitable temperature, There was a difference in heading promotion rate among middle Japonica cultivars. The moderate temperature required by middle-maturing Chinese cultivars was higher, and the early maturity of early japonica was lower. The moderate temperature required by middle and late Japonica cultivars was lower and affected by low temperature. By analyzing the relationship between heading date and temperature factors in 8 different sowing dates in greenhouse, it shows that increasing daily temperature and decreasing effective accumulated temperature are effective ways to shorten the heading days, but daily average temperature can not be too large or too small. The number of days of high temperature should not be large or small.