晋北高寒区历年种植胡麻100万亩左右。传统播期在立夏,并有“立夏种胡麻,七股八个叉”的说法。但生产上往往由于晚播春旱,缺苗断垄严重或种子待雨出苗延迟成熟,且苗期处于较高温度下,根系不发述,易形成弱苗或旺苗待长,后期发生枯黄旱死或贪青倒伏,造成大幅度减产。个别地方过早播种,在低温条件下种子霉烂,出苗率低,且易受晚霜的危 Northern Shanxi alpine planted 100 million mu of flax over the years. The traditional sowing in the beginning of summer, and “set up summer flax, seven stocks eight forks ” argument. However, the production often due to late sowing spring drought, lack of severed seedlings severely delayed seedling or seedling emergence and maturity, and the seedling at higher temperatures, the root does not say, easy to form weak seedlings or Wang Miao long, the late yellow Drought or greed lodging, resulting in a substantial cut. Sowed prematurely in some places, under the conditions of low temperature mildew seeds, the emergence rate is low, and vulnerable to night cream