作物调亏灌溉是建立在作物与水分关系基础上的一种节水高产灌溉技术。根据陕西长武、甘肃民勤等地的田间试验资料分析了适度缺水对作物产量的有益效应 ,表明调亏灌溉的适宜时段应该在作物的早期生长阶段。陕西长武和甘肃民勤小麦和棉花的试验结果表明 ,其水分亏缺程度可达到田间持水量的 45 %～ 5 0 % ,而对作物的产量没有不利影响 ,但可明显提高作物水分利用效率。并且讨论了调亏灌溉目前存在的一些问题。 Crop Regulated Deficit Irrigation is a water-saving and high-yield irrigation technology based on the relationship between crop and water. According to the field experiment data of Changwu of Shaanxi and Minqin of Gansu, the beneficial effects of moderate water deficit on crop yield were analyzed, indicating that the suitable period of regulated deficit irrigation should be at the early stage of crop growth. The test results of wheat and cotton in Minqin, Changwu, Gansu Province and Shaanxi Province show that the degree of water deficit can reach 45% ~ 50% of the field water holding capacity without adversely affecting the crop yield, but can significantly improve the water use efficiency . And some problems existing in regulated deficit irrigation are discussed.