1979年秋我区播种油菜4.4万亩,其中纯播3.1万亩,间作1.3万亩.越冬期间油菜死苗率85%以上的2.6万亩,占实播面积的60%,其余一般死苗率20—60%,给油菜生产造成很大损失.为总结经验教训,初步分析油菜死苗原因主要有以下几点: In the autumn of 1979, 44,000 mu of rapeseed were sown in our district, of which 31,000 mu were purely sowed and 13,000 mu were intercropped. During the wintering period, 2.6 million mu of rapeseed seedlings were 85% or more, accounting for 60% of the actual sowing area, and the remaining 20% -60%, causing great losses to rapeseed production.In order to sum up the experience and lessons, the primary reason for rapeseed death mainly includes the following points: