稻米垩白形成的气象生态基础研究

Meteoro-ecological basis of rice chalkiness formation.

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。

On the basis of field experiments with 19 rice rarities and various sowing dates in 13 places of whole country, meteoro-ecological basis of rice chalkiness formation is analysed in this paper. Results show that mean daily temperature in 15 days after rice full heading is the main factor affecting rice chalkiness. According to dynamic analysis of relationship between rice chalkiness and mean daily temperature in 15 days after full heading, it is known that rice chalkiness increases with raising temperature, the turn point being about 29℃(some difference among varities), and when the temperature closes to or exceeds 29℃, the chalkiness will be increased suddenly.