冬小麦是庆阳地区主要粮食作物,种植面积占粮作面积70％,其中60％分布于旱塬。近年来,尤其是1983、84年旱塬地小麦倒伏严重,表现在发生早、面积大、程度重。1984年全区倒伏面积70万亩,占麦田总面积的20％,主要发生在正宁、宁县及庆阳县中南部旱塬。依小麦倒伏发生的迟早和严重程度,一般减产2～4成,对小麦单产影响很大,且品质差、商品率低,是本区当前生产中需要解决的新课题。为确定旱塬小麦倒伏的原因,并提出相应的防御措施,我们对旱塬地小麦倒伏问题进行 Winter wheat is the main food crop in Qingyang. The area under cultivation accounts for 70% of the total grain area, of which 60% is distributed in the dry land. In recent years, especially in 1983,84 years of wheat in arid highland lodging serious, manifested in the early occurrence, large area, heavy degree. In 1984 the area lodging area 700000 mus, accounting for 20% of the total area of ​​wheat fields, mainly in Zhengning, Ningxian and Qingyang County in central and southern dry plateau. According to the sooner or later the severity of wheat lodging occurs, the general reduction of 2 to 4 percent, a great impact on the yield of wheat, and poor quality, low commodity rate is the current production of the area need to be addressed a new topic. In order to determine the reason of wheat lodging in dryland and to propose corresponding defensive measures, we conducted a study on the wheat lodging in dryland