水稻种子是水稻生产中最基本的生产资料,提高水稻种子质量,是保证水稻稳产高产的基础措施之一。寒地水稻生产,生育期短,霜冻来得早,冬季气温很低,给水稻种子的收获、干燥和贮藏保管增加不少困难,技术措施或管理稍有不当,即遭受冻害而坏种。自50年代以来,黑龙江省水稻严重坏种的年份已有12个,一般每3～5年就伴随低温 Rice seeds are the most basic means of production in rice production. Improving rice seed quality is one of the basic measures to ensure a stable and high yield of rice. Cold rice has short production period, early frost and low winter temperature, which makes it difficult to harvest, dry and store rice seeds. The technical measures or management are a little bit improper, which means frost damage and bad kind. Since the 1950s, there have been 12 years of serious and bad paddy rice in Heilongjiang Province, and generally every 3 to 5 years accompanied by low temperature