论文部分内容阅读
京郊现有主栽小麦品种,在浇冻水的基础上,一般都能安全越冬.立春后气温回升,当地温平均上升0～2℃以后,小麦的根系和地上部开始缓慢生长.当冬前新生而停止生长的叶片伸长1厘米时,即称为小麦进入返青期.此期在京郊一般是2月底或3月上旬.返青早晚决定于春季气温回升的早晚.
The existing cultivated wheat varieties in the suburbs of Beijing are usually able to win the winter safely on the basis of the pouring of frozen water.After spring, the temperature rose and the average temperature of the local area rose 0 ~ 2 ℃, the roots and shoots of the wheat started to grow slowly. Pre-newborn and stop the growth of the leaf elongation of 1 cm, the wheat is called into the greenback period this period in the suburbs of Beijing is generally the end of February or early March. Returning sooner or later decided to spring morning temperature rise sooner or later.