Management of plant nutrition using fertilizers is an approach to deal with drought and increase water productivity in paddies. The effects of different irrigation regimes and the application of biological and chemical nitrogen fertilizers were studied on yield, yield components, and water use efficiency of rice cultivars in a field experiment at the Rice Research Institute of Iran, Rasht, in 2018–2019 crop years. The study was split-split plots based on the complete randomized block design with three replications. The main plot was assigned to irrigation interval at three levels of full flood irrigation and irrigation intervals of 10 and 15 days, the sub-plot was assigned to fertilizer type at three levels of seedling root inoculation with biofertilizer, seedling root inoculation with biofertilizer + chemical N fertilizer to meet 50% of plant N requirement, and chemical N fertilizer (as urea) to meet 100% of plant N requirement, and the sub-sub-plot was assigned to rice cultivar at two levels of 'Hashemi' and 'Gilaneh'. The results of analysis of variance showed that the grain yields in the treatments of 10-day and 15-day irrigation interval were 28% and 42% lower than that in the treatment of full flood irrigation, respectively. The number of unfilled grains per panicle was 20% higher in the treatment of 100% chemical N fertilizer than in the combined application of the biological and chemical fertilizers. The irrigation interval of 15 days with the combined application of the fertilizers consumed less water in both cultivars than the other treatments. The application of biofertilizer with chemical fertilizer significantly influenced productivity, thereby reducing chemical fertilization by 50% and alleviating environmental pollution.

使用肥料管理植物营养是应对干旱和提高稻田水生产力的一种方法。在伊朗拉什特水稻研究所的田间试验中，研究了不同灌溉制度和生物和化学氮肥施用对水稻品种产量、产量构成和水分利用效率的影响，2018-2019 作物年度. 该研究是基于具有三个重复的完全随机区组设计的分裂图。主地块在满灌和10天和15天的灌溉间隔三个级别分配灌溉间隔，子块在幼苗根部接种生物肥料的三个级别分配肥料类型，幼苗根系接种生物肥料+化学氮肥满足50%的植物氮需求，化学氮肥（如尿素）满足100%的植物氮需求，亚子小区分两个水平分配给水稻品种'Hashemi' 和 'Gilaeh'。方差分析结果表明，灌水间隔10天和15天处理的粮食产量分别比满灌处理低28%和42%。100%化学氮肥处理比生化肥配施处理每穗未饱满粒数高20%。与其他处理相比，两个品种的 15 天灌溉间隔与肥料联合施用耗水量较少。