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1994～1995年度在气温稳定通过0℃以后，用冷冻返青法对北京地区冬小麦主栽品种京-411的5个播期的植株进行抗寒力鉴定，结果是10月14日播种、冬前积温436.1度日、3．9个叶龄的小麦植株抗寒能力最强。
From 1994 to 1995, after the temperature was stable at 0 ℃, the cold-resistance of five sowing-date plants from Beijing -411, the main winter wheat cultivar in Beijing, was identified by the method of freezing and rejuvenation. The result was October 14th sowing, On the 436.1th day, the plant with 3.9 leaf age had the strongest cold resistance.