本文通过春小麦不同前茬土壤水分动态变化及利用效率的研究,初步认为合理轮作倒茬不仅是培肥地力,解决旱农生产地区肥料不足的有效途径,而且是充分发挥自然降水,协调肥水关系,提高土壤水分利用效率增产粮食的有效措施。根据旱农生产区的自然特点和生产条件,从理论和实践上阐述了合理轮作倒茬对发展旱农生产的重要意义. Based on the study on dynamic changes of soil moisture and utilization efficiency of different previous cropping of spring wheat, this paper believes that rational rotation of cropping is not only an effective way to fertilize the land in drought-agro-producing areas, but also give full play to the relationship between natural precipitation, Effective Measures of Increasing Grain Yield by Using Soil Water Use Efficiency. According to the natural characteristics and production conditions of the dry farming areas, the importance of rational rotation of wheat on the development of dry farming is expounded theoretically and practically.