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冬去春来,气温回升。当气温稳定在3℃以上时,叶片转绿,半数以上的植株心叶长出0.5—1厘米时,即返青,小麦开始由休眠状态逐渐恢复生长。从返青到起身这段时间为返青期,常年约需一个月时间。返青期的生长中心是生根、长叶、继续分蘖,同时幼穗开始分化至二棱末期。返青期是影响麦苗升级和群体消长的关键时刻,是决定穗数和每穗小穗数的关键时期。该期田间管理的主要任务是促进小麦早返青,调节群体力求合理,为提高分蘖成穗率和争取大穗打
Winter to spring, the temperature rose. When the temperature was stable at 3 ℃ above, the leaves turn green, more than half of the plant heart leaves grow 0.5-1 cm, the green, wheat began to gradually resume from hibernation growth. From returning to youth to get up this time for the return of youth, perennial about a month’s time. Green growth center is the rooting, long leaves, continue tillering, while the panicle began to differentiate to the late two-edge. Rejuvenation is the key moment that affects the upgrading of wheat seedlings and the population growth and decline. It is the key period for determining the number of spikes and the number of spikelets per spike. The main task of field management in this period is to promote the early greening of wheat and regulate the group to seek reasonable rates. In order to increase the rate of tillering into spike and fight for big spike