一、概述曲靖地区小麦播种面积120余万亩, 占粮食作物面积的15.5％,年产小麦2.46亿斤,占粮食总产量的7.1％,亩产200斤上下,很不稳定。造成小麦产量低而不稳的因素较多,小麦冷冻害确系主要原因之一。北部几县小麦冷冻害更为突出,经常造成小麦大减产,甚至颗粒无收。低温对小麦造成的危害分为两类;一类为冻害(freezing injury),一类为冷害(chilling injury)。曲靖地区小麦生育季节中,冻害和霜冻(frost damage)为混合发生,本文将霜冻归入冻害一类。将冻害和冷害合称为小麦冷冻害。解放以来,我国北方冬麦区对小麦冻害 I. Overview Qujing wheat planting area of ​​more than 120 mu, accounting for 15.5% of the area of ​​food crops, with an annual output of 2.46 million pounds of wheat, accounting for 7.1% of total grain output, 200 kg per mu up and down, very unstable. As a result of low and unstable wheat yield more factors, wheat freezing injury is one of the main reasons. The freezing injury of wheat in the northern counties is even more conspicuous, often resulting in a large decrease in wheat yield and even failure of grain collection. Harm caused by low temperature on wheat is divided into two categories; one is freezing injury, one is chilling injury. In the growing season of wheat in Qujing, frost damage is a mixture of frost damage and frost damage. Frozen and cold damage collectively known as wheat freezing damage. Since the liberation, winter wheat region in northern China on wheat frost damage