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上海地区,一月上旬平均气温通常下降至3℃左右,直至二月上旬才逐渐回升到3℃以上。因此,一般把“小寒”～“立春”这段时间称为油菜的越冬期,又把“小寒”时的苗势称为越冬苗势。但本人认为,从严格的时间概念来说,“小寒”处于冬前与越冬的交界期,所以把“小寒”时的苗势称为“临冬”苗势,似乎更确切些。油菜临冬时的苗势,对油菜的越冬、春发,直至终期的农艺、经济性状都有十分密切的关系。临冬苗势,是这一时期油菜外部形态变化和内部生理活动的综合反映。历年来我们主要是通过测定油菜绿叶数、叶面积、
In Shanghai, the average temperature generally dropped to about 3 ℃ in early January and gradually rose to above 3 ℃ until early February. Therefore, the general “Osamu” to “beginning of spring” this period of time called rape overwintering, again “Osamu” when the seedling called overwintering seedling strength. However, I think that from the strict concept of time, “Osamu” is in the pre-winter and overwintering boundaries, so the “Osamu” seedlings when called “Pro winter” seedling, it seems more accurate. Rape Linlin when the seedlings, overwintering rape, Chunfa, until the end of the agronomic, economic traits have a very close relationship. Pro-winter seedling, rape this period is the external shape changes and internal physiological activities of a comprehensive reflection. Over the years we mainly through the determination of the number of rape leaves, leaf area,