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大田试验结果表明,拔节期为冬小麦水分最敏感的生育时期,其次为孕穗期和抽穗～开花期,而返青～起身期充分供水则造成冬小麦明显减产。拔节期最大调亏程度为0～50cm土层土壤含水量≥田间持水量的65％,过小则导致明显减产;孕穗～抽穗期、抽穗～灌浆前期最大调亏程度为0～80cm和0～100cm土层土壤含水量≥田间持水量的60％;灌浆后期最大调亏程度为0～100cm土层土壤含水量≥田间持水量的50％,由此建立了冬小麦调亏灌溉制度。
Field experiments showed that the jointing stage was the most sensitive period of winter wheat moisture growth, followed by booting stage and heading stage ~ flowering stage, while returning to greening ~ sufficient water supply during the starting phase resulted in significant decrease of winter wheat yield. The maximum degree of deficit reduction at jointing stage was 65% of the soil water content of 0 ~ 50cm soil layer ≥ field water holding capacity. If the soil water content was too small, the yield would be significantly reduced. The maximum degree of deficit reduction at heading ~ heading stage was 0 ~ 80cm and 0 ~ The soil water content of 100 cm soil layer was 60% of the field water content. The maximum degree of deficit reduction in the later filling stage was the soil water content of 0 ~ 100 cm soil layer, which was 50% of the field water capacity. Thus, the regulated deficit irrigation system of winter wheat was established.