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冬小麦返青拔节期是营养体(茎、叶)迅速生长和生殖体(穗)开始分化的时期。冬小麦在完成春化阶段后进入光照阶段不久,茎生长锥就慢慢地伸长,接着就是穗分化的开始。这个时期,晋南地区约在三月上中旬,晋中、晋东南及西山地区约在四月上中旬。从小穗原始体的第一个时期起到二稜期,如果水肥供应适时、适量,就可使茎顶端的分生组织活动的时间延长,生长锥的生长和发育加强。因而使穗子变大,小穗增加;到二稜未期每穗上的小穗数(沟数)已
Winter wheat regrowth Jointing stage is vegetative (stem, leaf) rapid growth and genital (spike) began to differentiate. Shortly after winter wheat entered the illumination stage after the vernalization stage was completed, the stem growth cone was gradually elongated, followed by the start of spike differentiation. During this period, the southern region of about mid-March, Jinzhong, southeast and Xishan area in about mid-April. From the first period of the spikelet primitive to the two-ridged stage, if the supply of water and fertilizer is timely and moderate, the time of meristem activity at the top of the stem can be prolonged and the growth and development of the growth cone can be strengthened. Thus causing the ears to grow larger and the spikelets to increase; the number of spikelets