丹寨县位于云贵高原东斜坡上,境内海拔900米左右。冬小麦产量历来不高,原因是多方面的。从农业气候方面看,主要有两个不利条件。一是播期天气恶劣的年份较多,有些年份阴雨连绵,湿害严重;有些年份雨水过少,秋旱严重。因而秋播质量低,播期也掌握不好,不易获全苗、壮苗。二是春季阴雨天多,不利于开花授粉和灌浆成熟。用农业气候分析法确定冬小麦的适宜播种期,能减轻前一个不利气候条件的影响,是冬小麦增产的一项措 Danzhai County is located on the east slope of Yunnan-Guizhou Plateau, with an elevation of about 900 meters. Winter wheat production has always been high, for many reasons. In terms of agricultural climate, there are mainly two disadvantages. First, sowing the weather is bad in many years, some years of heavy rain, severe wet damage; in some years, too little rain, autumn drought serious. Autumn sowing thus low quality, sowing is also not good, not easy to be full seedlings, strong seedlings. Second, more rainy days in spring is not conducive to flowering pollination and filling mature. Determining the appropriate sowing date of winter wheat with agro-climatic analysis can mitigate the effects of the previous unfavorable climatic conditions and is a measure to increase winter wheat production