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在全国13个点、19个品种多播期试验基础上,对稻米垩自形成的气象生态基础进行了分析。结果表明,水稻齐穗后15天的日均温是影响稻米垩白大小的主要气象因子。经对稻米垩白与齐穗后15天内均温关系的动态分析可知,稻米垩白随该时段温度提高而增大的拐点温度约为29℃(品种间略有差异),接近或超过该点温度,稻米垩白会突发性地增加。
Based on the experiment of 13 species and 19 varieties in China, the meteorological and ecological basis of rice self-formation was analyzed. The results showed that the average daily temperature of 15 days after heading of rice was the main meteorological factor affecting the grain size of rice. The dynamic analysis of the relationship between rice chalkiness and the average temperature within 15 days after heading showed that the inflection point of rice chalkiness increased with the increase of temperature in this period was about 29 ℃ (a slight difference among varieties) approaching or exceeding the point Temperature, rice chalky will suddenly increase.