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适期播种的地膜覆盖小麦,揭膜的适宜温度为日平均气温稳定在3-5℃,穗分化处在二棱期(不能超过二棱后期),在惠民地区的时间约为3月5日前后,正值大田小麦的返青期。大田小麦开始返青时(惠民地区常年在二月下旬),膜下小麦的主茎叶龄超过了6叶1心以及早播晚盖麦田,揭膜时间宁早勿晚,日平均气温稳定在1-3℃时即可揭膜,以延长穗分化时间,争取更多的穗籽粒数;当膜下小麦的主茎叶龄在5叶1心以下,生长锥未进入伸长期时,应适当推迟揭膜时间,以促进穗分化,加速生育进程。
Appropriate seeding mulching wheat, uncovering the appropriate temperature for the average daily temperature was stable at 3-5 ℃, spike differentiation in the two-edge period (can not exceed the late two-edge), in the Huimin area is about March 5 Day after day, coincided with the return of green wheat fields. Field wheat began to turn green (Huimin perennial in late February), the main stem of wheat under the film leaf age more than 6 leaves and 1 heart and early sowing later wheat fields, uncovering the film sooner rather late, the average daily temperature was stable at 1-3 ℃ when you can uncover the membrane in order to extend the ear differentiation time for more spike grain number; when the main stem of wheat under the film leaves in the heart of 5 leaves 1, the growth cone did not enter the elongation period should be appropriate Postpone the opening time to promote spike differentiation and accelerate the process of reproduction.