The limited factors of the north-distribution are colder absolute minumum temperature in winter in inland and not enough active accumulated temperature in seashore.
分布北界的限制因子，在内陆为冬季绝对低温过低，在海滨为夏季活动积温不足。
Using the main varieties in the production as samples, the relationship between the active accumulated temperature and chalkiness of rice was analyzed.
以生产上大面积推广应用的水稻主栽品种为样本，分析了东北全区域活动积温与水稻垩白率、垩白面积、垩白度的关系。
Using the main varieties in the production as samples, the relationship between the active accumulated temperature and chalkiness of rice was analyzed.
以生产上大面积推广应用的水稻主栽品种为样本，分析了东北全区域活动积温与水稻垩白率、垩白面积、垩白度的关系。
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