This study investigates the water productivity of three rice genotypes in physical, economic and virtual water terms through different irrigation and fertilizer treatments. The experiment was conducted in 2017 and 2018 in split plot designs based on a randomized complete block design with three replications. The main factors include irrigation regimes: flood irrigation of I1 and alternate irrigation treatments of I2, I3 and I4 that involve alternate irrigation with irrigation intervals of 7, 14 and 21 days, respectively. The subfactors include different rice genotypes at three levels of certified local Hashemi, M5 and M12 genotypes at three levels of nitrogen fertilizer of 60, 80 and 100 kg N/ha¹. Results showed that the certified Hashemi variety with the 7-day irrigation interval and 100 kg N/ha¹; treatment showed satisfactory physical water productivity (being 1.41 and 1.01 kg/m³ in 2017 and 2018, respectively), and also the highest net benefit per drop (being 31 200 and 29 800 rials/m³ in 2017 and 2018, respectively). According to the results of this study, using alternate irrigation at the 7-day irrigation interval would save 285 million m³ of water in the Sefidroud irrigation and drainage network.

中文翻译：

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伊朗北部拉什特不同灌溉制度和氮肥处理下三种水稻基因型的水分生产力评估*

本研究通过不同的灌溉和施肥处理调查了三种水稻基因型在物理、经济和虚拟水方面的水分生产力。该实验于 2017 年和 2018 年在基于随机完整区组设计的裂区设计中进行，三个重复。主要因素包括灌溉制度：I1 的漫灌和 I2、I3 和 I4 的交替灌溉处理，涉及交替灌溉，灌溉间隔分别为 7、14 和 21 天。子因素包括三个水平的不同水稻基因型，即在60、80和100 kg N/ha ¹三个氮肥水平下认证的当地Hashemi、M5和M12基因型。结果表明，经过 7 天灌溉间隔和 100 kg N/ha ¹; 处理显示出令人满意的物理水生产率（2017 年和 2018 年分别为 1.41 和 1.01 kg/m ³），并且每滴净收益也最高（2017 年和 2018 年分别为 31 200 和 29 800 里亚尔/m ³）。根据这项研究的结果，使用交替灌溉在7天的间隔灌溉将节省2.85亿米³的水的Sefidroud灌溉和排水网络。