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由于复种指数的逐年增加,油菜育苗移栽的面积逐年减少,直播油菜几乎占领了整个油菜大田。但由于种种原因,直播油菜往往不能适期播种,因而达不到壮苗越冬的丰产长相。纤弱的油菜苗,经不起严冬冰雪,大部分油菜田不同程度地受到冻害,有的甚至全部冻死而绝收。为此,应根据天气变化,因地制宜,采取防冻措施,以保油菜安全越冬。
As the multiple crop index increased year by year, the transplanted area of rapeseed seedlings decreased year by year, live rapeseed almost occupied the entire rapeseed field. However, due to various reasons, live rapeseed is often not suitable for sowing, and thus fail to strong seedling winter harvest of long-lived appearance. Slender rape seedlings, can not stand the winter snow, most of the rape fields are subject to frost damage to varying degrees, and some even all frozen to death. To this end, should be based on changes in the weather, according to local conditions, to take antifreeze measures to protect the safety of peppers wintering.