油菜从移栽到现蕾,历期约90—100天,这阶段的气温特点是由高到低,再由低到高。太仓地区,从11月下旬的10℃左右降到1月中旬的2℃左右,然后逐步回升到3月上旬的7℃左右。油菜的生长速度也随着温度的高——低——高而发生快——慢——快的变化。据报道,越冬期以放射性同位素磷(P~(32))涂在主茎的第十片叶上,观察磷素向什么器官运输和各个器官吸收量。结果表明,根系吸收最多,占56.82％;叶片次之,占22.48％。由此可以看出,越冬期油菜的生育中心是根系和叶片。为此,油菜越冬阶段的主攻方向是长根和茎粗叶多,冬苗健壮争春发,为增枝 Rape from transplanting to budding, the duration of about 90-100 days, the temperature characteristics of this stage is from high to low, then low to high. Taicang region, from late November to about 10 ℃ in mid-January about 2 ℃, and then gradually rose to around 7 ℃ in early March. The growth rate of rape also changes fast, slow, and fast with the high-low-high temperature. It is reported that during the winter, radioactive isotope phosphorus (P 32) was applied to the tenth leaf of the main stem to observe the transport of phosphorus to various organs and the absorption amount of each organ. The results showed that the root system uptake, accounting for 56.82%; leaf followed, accounting for 22.48%. It can be seen that the breeding center of winter rape is the root system and leaves. To this end, the main direction of the rape overwintering stage is the long roots and stems more leafy, winter seedling robust spring competition for the increase branch