忻县地区一九七六年秋播种冬小麦47万亩,一九七七年春发生了百年罕见的死苗现象,因死苗严重而改种的面积达26.8％,未改种麦田死苗也在15—75％。 为了弄清冬小麦越冬死苗原因,我们做了一些调查,并进行了分析,现整理如下。 In the autumn of 1976, Xinxian Prefecture sowed 470000 hectares of winter wheat. In the spring of 1977, a rare phenomenon of dead seedling occurred in the past 100 years. The area of ​​the seedling was 26.8% due to the serious dead seedling, and the dead seedling of the unmodified wheat field was also 15 -75%. In order to understand the reasons for winter wheat winter dead, we did some research and conducted an analysis, are now organized as follows.