一收获适期华北地区一般是种大粒种花生,由于它的生育期长,而该地区无霜期又较短,往往不能看到它的真正成熟特征(茎端停止生长,基部叶变黄,部分脱落),只是在温度低的情况下,花生被迫停止生长或因霜冻而茎枯叶落。所以,花生收获过早,有些荚果得不到充分发育,形成秕果或空果,造成减产,但花生又是喜温作物,收获晚了种子易受冻害。这样,不仅使种子降低了发芽力,甚至丧失了发芽力,同时,也能降 A harvest in the North China region is generally a large grain peanut, because of its long growth period, and the frost-free period and the region is short, they often can not see its true maturity characteristics (stem to stop growth, the base leaves turn yellow, part of the fall ), But peanuts are forced to stop growing or stem frost falls due to frosts at low temperatures. Therefore, the peanut harvest too early, some pods are not fully developed, the formation of mango or empty fruit, resulting in reduced production, but the peanut is a thermophilic crop late harvest vulnerable to cold damage. In this way, not only reduces the seed germination, or even lost the germination force, but also can be reduced