渭北油菜越冬死苗是个突出问题。1982年我们在乾县大墙公社调查,全社播种油菜1100亩,死苗达70％以上的有384.0亩,占总面积的34.9％。小寨、东升等队的油菜几乎全部受冻致死。但是,在同一气候条件下,死苗何以有轻有重,是值得深思的问题。根据我们调查和试验,认为油菜越冬死苗是受多种因素作用 Weebei rape overwintering seedlings is a prominent issue. In 1982, we conducted a survey on the Great Wall Commune in Qianxian County. The whole society sowed 1,100 mu of rapeseed and 384.0 mu of dead scarf reached 70%, accounting for 34.9% of the total area. Xiaozhai, Dongsheng and other team rape almost died of all being frozen. However, under the same climatic conditions, it is a question worth pondering why dead seedlings have both light and heavy weight. According to our survey and experiment, we think that the more winter cold rapeseed is affected by many factors