1994年保定地区播种小麦556万亩,自返青开始陆续发生死苗,面积达306万亩,占麦田总面积的55％,死苗率一般为6—10％,严重的达11％以上,其中1.8万亩绝收,特点是北部多于南部。 一、主要原因 1.不利的气候条件。1993年秋小麦播种基础较好,88.6％的麦田浇了底墒水,越冬前天气正常,11月中旬前平均气温6℃以上,11月中旬末气温骤然下降到零下2—3℃,最低气温达零下6℃,高碑 In 1994, 5.56 million mu of wheat were planted in Baoding area. Dead seedlings occurred successively in the area of ​​greening, covering an area of ​​306 mu, accounting for 55% of the total area of ​​the wheat field. The rate of dead seedlings is usually 6-10% and seriously over 11% 1.8 million mu absolutely free, characterized by more than the northern part of the south. First, the main reason 1. Adverse weather conditions. In the autumn of 1993, the planting base of wheat was better. 88.6% of the wheat fields were poured with water at the end. The weather before winter was normal. The average temperature was above 6 ℃ before mid-November. At the end of November, the temperature dropped suddenly to minus 2-3 ℃ and the minimum temperature reached minus 0 6 ℃, high monument