我国黄、淮河流域北方冬油菜生产近几年发展很快,1977年种植面积369万亩,单产59斤,1982年达到1000万亩左右,单产100斤以上。油菜生产潜力很大,但是,这一地区冬季温度较低,一月份气温常在0℃以下,最低可达—20℃以下,加上干旱少雨,冻害死苗严重, In recent years, the production of northern winter rapeseed in the Yellow River and Huaihe River has been developing rapidly. In 1977, the planting area was 3.69 million mu with a yield of 59 kg. In 1982, it reached about 10 million mu with a yield of more than 100 pounds per mu. However, the winter temperatures in this area are relatively low. The temperature in January is often below 0 ° C and the lowest is below -20 ° C. In addition to the drought,