Regulated deficit irrigation (RDI) is an important means by which the water use efficiency (WUE) of peanut can be improved and facilitates the sustainable development of the peanut industry. However, most studies of RDI have only focused on single growth periods, which the water-saving potential. In this study, continuous regulated deficit irrigation (CRDI) was used to significantly improve the WUE of peanut through an experiment employing a split-plot design. Three levels of water deficit treatment, severe (H1/J1, 45% field capacity), moderate (H2/J2, 55% field capacity), and mild (H3/J3, 65% field capacity), were applied in the flower pegging stage (H) and the pod setting stage (J). Moderate CRDI (H2J2) stably improved the instantaneous water use efficiency of peanut leaves. Yield was not significantly decreased under the H2J2 treatment, and was only 4.47% lower than that of the H3J2 treatment, in which the yield was the highest. The highest WUE was observed in the H2J2 treatment (1.87 kg·m⁻³). The first time that the soil water content reached the lower limit in the pod setting stage, the proline content in the H1J1 treatment was 13.57 times higher than that in the H3J3, indicating that peanuts in the H1J1 treatment experienced substantial drought stress. The second time that the lower limit of soil water content was reached, the proline content in the H1J1 treatment was 7.14 times higher than that in the H3J3 treatment, indicating that the peanut drought resistance was improved by the drought-rehydration exercise at the flower pegging stage and drought stress was alleviated in the pod setting stage. We conclude that moderate CRDI is beneficial to peanut drought resistance for arid and semi-arid areas, and significantly promoted higher WUE.

调节亏缺灌溉(RDI)是提高花生水分利用效率(WUE)、促进花生产业可持续发展的重要手段。然而，大多数RDI的研究只集中在单一生育期，即节水潜力。在这项研究中，通过采用裂区设计的实验，使用连续调节亏缺灌溉 (CRDI) 显着提高了花生的 WUE。挂花采用严重（H1/J1，45%田间持水量）、中度（H2/J2，55%田间持水量）和轻度（H3/J3，65%田间持水量）三种缺水处理水平阶段 (H) 和吊舱设置阶段 (J)。中等CRDI（H2J2）稳定提高花生叶片瞬时水分利用效率。H2J2处理下产量没有显着降低，仅比产量最高的 H3J2 处理低 4.47%。在 H2J2 处理中观察到最高的 WUE（1.87 kg·m^-3 )。在结荚期土壤含水量首次达到下限时，H1J1处理的脯氨酸含量是H3J3处理的13.57倍，说明H1J1处理花生经历了显着的干旱胁迫。第二次达到土壤含水量下限时，H1J1处理脯氨酸含量比H3J3处理高7.14倍，表明插花处进行旱复水运动提高了花生的抗旱性结荚期减轻了干旱胁迫。我们得出结论，适度的CRDI有利于干旱和半干旱地区花生的抗旱性，并显着促进更高的WUE。