Alternate wetting and drying irrigation (AWDI) is a water-conserving strategy in rice fields. An experiment, conducted as a split-split plot design and based on a randomized complete block design with three repetitions, investigated the effect of intermittent irrigation and nitrogen on yield and water-use efficiency during 2017 and 2018 crop years in northern Iran. The irrigation intervals (flooding (I1), 7 days (I2), 14 days (I3)) were main factors, different levels of nitrogen fertilizer (50 kg/ha (N1), 75 kg/ha (N2), 100 kg/ha (N3)) were sub-factors, and cultivars (Gilaneh (C1) and Hashemi (C2)) were sub-sub-factors. Results showed that compared to flood irrigation, intermittent irrigation led to 16 to 43% and 13 to 43% water economization in 2017 and 2018, respectively, accompanied by a significant increase in water-use efficiency. By increasing the irrigation intervals, grain yield of the Gilaneh cultivar decreased significantly in all three fertilization levels. Compared to flood irrigation, total dry matter reduced significantly by increasing the irrigation interval. Maximum grain yield, total dry matter, and harvest index were achieved for the 100 kg/ha nitrogen fertilizer treatment in I1, I2, and I3 levels. Intermittent irrigation reduced leaf relative water content and increased leaf proline content in both cultivars. Leaf relative water content (R = 0.89**) showed the highest correlation coefficient with grain yield. The Hashemi cultivar showed higher leaf relative water content and leaf proline content and, while achieving 16.61% and 13.94% water conservation in the I2 treatment in 2017 and 2018, respectively, resulted in a yield equivalent to flood irrigation.

交替的干湿灌溉（AWDI）是稻田的节水策略。一项实验（作为分割剖分图设计）并基于具有三个重复的随机完整区组设计，研究了伊朗北部2017和2018作物年度间断灌溉和氮肥对产量和水分利用效率的影响。灌溉间隔（洪水（I1），7天（I2），14天（I3））是主要因素，不同水平的氮肥水平（50千克/公顷（N1），75千克/公顷（N2），100千克/ ha（N3））是子因子，而栽培种（Gilaneh（C1）和Hashemi（C2））是子因子。结果表明，与洪水灌溉相比，间歇灌溉在2017年和2018年分别节水16％至43％和13％至43％的用水，同时用水效率显着提高。通过增加灌溉间隔，在所有三个施肥水平上，吉兰（Gilaaneh）品种的谷物产量均显着下降。与洪水灌溉相比，增加灌溉间隔可以显着减少总干物质含量。在I1，I2和I3水平下，以100 kg / ha的氮肥处理可获得最大的谷物产量，总干物质和收获指数。间歇灌溉降低了两个品种的叶片相对含水量，并增加了叶片脯氨酸的含量。叶片相对含水量（R = 0.89 **）与籽粒产量表现出最高的相关系数。Hashemi品种显示出较高的叶片相对含水量和脯氨酸含量，并且在2017年和2018年的I2处理中分别实现了16.61％和13.94％的节水率，产量相当于洪水灌溉。