正常生长的小麦,当春季气温上升至10℃以上时,小麦基部节间开始伸长,节间露出地面1.5-2.0厘米时称为拔节。以节间长出地面2厘米左右为拔节期的主要标志,小麦拔节期是冬小麦整个生长发育过程中的重要时期,此期是小麦生长的第二个吸肥高峰期,也是小麦需肥临界期。加强此时的麦田管理对争取冬小麦穗粒重、防止小麦后期早衰和提高小麦品质具有重 Normal growth of wheat, when the spring temperature rose to above 10 ℃, the beginning of the expansion of the basal internodes of wheat, internodes exposed ground 1.5-2.0 cm when called jointing. To grow internodes about 2 cm above ground for the main signs of jointing, jointing wheat winter wheat growth and development throughout the important period of this period is the second peak of wheat growth, but also the critical period of wheat need fertilizer . Strengthen the wheat field management at this time to win the grain weight of winter wheat spike, to prevent premature failure of wheat and improve the quality of wheat weight