无定河流域位于伊克昭盟西南部的乌审旗境内。果树生产是从五十年代末期开始发展起来的,由于起步晚,又是处于毛乌素沙漠的腹地,主要分布在无定河和纳林河的一、二级阶地和沙质丘陵地,土壤大多数为沙土和沙质壤土。根据三个主要产区的土样分析,其土壤特点是质地粗,底状差,养分低。由于本地区水热条件较好,栽培的果树以大苹果,梨为主,但这些树种要求土壤 Wudinghe basin is located in Wushenqi in the southwest of Iqqiu League. Fruit tree production was developed from the late 1950s. Because of the late start, the fruit trees are located in the hinterland of the Mu Us Desert, mainly in the first and second order terraces and sandy hilly areas of the Wuding River and the Nalin River. Most of the soil is sandy soil And sandy loam. According to the analysis of soil samples in the three main producing areas, the soil characteristics are coarse texture, poor bottom shape and low nutrient content. Due to better hydrothermal conditions in the region, the cultivated fruit trees are dominated by large apples and pears, but these species require soil