冬小麦一般在日平均温度连续几天达3℃以上时开始返青,这时小麦次生根大量生长,叶片长得快,并且能继续增加新的分蘖,穗原始体开始分化。冬小麦在返青时期生长的好坏,直接关系到春季分蘖和成穗数的多少以及秆壮和穗大的问题,因此必须切实抓好冬小麦的返青管理。 Winter wheat generally begins to rejuvenate when the daily average temperature reaches above 3 ° C for several days in a row. At this moment, the secondary root of wheat grows in large numbers, the leaves grow fast, and new tillers can continue to be added, and the spike primitive body begins to differentiate. The growth of winter wheat during turning green period is directly related to the number of tillers and spikes in spring, as well as the problems of stalks and spikes. Therefore, it is necessary to earnestly manage the rejuvenation of winter wheat.