Univrsity of Tehran Press Iranian Journal of Field Crop Science 2008-4811 53 2 2022 06 22 Effect of irrigation and nitrogen fertilizer on yield, inputs use efficiency and seed quality of sesame cultivars Effect of irrigation and nitrogen fertilizer on yield, inputs use efficiency and seed quality of sesame cultivars 221 234 89665 10.22059/ijfcs.2021.319665.654807 FA Ali Saboury Ph.D student of Agronomy, Faculty of Agriculture, Firoozabad Branch, Islamic Azad University, Firoozabad, Shiraz, Iran Majid Gholamhoseini Assistant Professor, Oilseed Research Department, Seed and Plant Improvement Institute. Agricultural Research, Education and Extension Organization (AREEO), Karaj. Iran. Forrod Bazrafshan Department of Agriculture, Firoozabad Branch, Islamic Azad University, Firoozabad, Shiraz, Iran Farhad Habibzadeh Assistant Professor of Department of Plant Production and Breeding, Faculty of Agriculture and Natural Resources, Imam Khomeini International University, Qazvin, Iran Bahram Amiri Department of Agriculture, Firoozabad Branch, Islamic Azad University, Firoozabad, Shiraz, Iran. Journal Article 2021 02 24 In order to investigate the quantitative and qualitative response of three sesame cultivars <br />(<em>Sesamum indicum </em>L.) to different irrigation and fertilizer treatments, an experiment was conducted in the research farm of Seed and Plant Improvement Institute, Karaj, during 2016 and 2017. The experiment was performed as split-factorial plots in a randomized complete block design with three replications. Irrigation treatments at two levels (low and full irrigation) were the main plots and factorial plots with different amounts of nitrogen and sesame cultivars were the subplots. The results showed that in full irrigation conditions, application of 120 kg N ha^-1 increased sesame seed yield by 83% compared to non-application. In contrast, this increase in yield in response to the application of nitrogen in low irrigation treatment was 40%. The results also showed that the highest water use efficiency in full and low irrigations was obtained from Oltan and Dashtestan 2 cultivars with 120 kg N ha^-1, respectively. Dashtestan 2 cultivar had the highest (51%) and Naz single-branched cultivar had the lowest (47%) oil content. In general, the results showed that in full irrigation treatment, nitrogen fertilizer application for all three cultivars can be justified; In contrast, in low irrigation conditions and none of the cultivars, grain yield higher than 500 kg N ha^-1 was not achieved even with high amounts of nitrogen (60 and 120 kg N ha^-1). In order to investigate the quantitative and qualitative response of three sesame cultivars <br />(<em>Sesamum indicum </em>L.) to different irrigation and fertilizer treatments, an experiment was conducted in the research farm of Seed and Plant Improvement Institute, Karaj, during 2016 and 2017. The experiment was performed as split-factorial plots in a randomized complete block design with three replications. Irrigation treatments at two levels (low and full irrigation) were the main plots and factorial plots with different amounts of nitrogen and sesame cultivars were the subplots. The results showed that in full irrigation conditions, application of 120 kg N ha^-1 increased sesame seed yield by 83% compared to non-application. In contrast, this increase in yield in response to the application of nitrogen in low irrigation treatment was 40%. The results also showed that the highest water use efficiency in full and low irrigations was obtained from Oltan and Dashtestan 2 cultivars with 120 kg N ha^-1, respectively. Dashtestan 2 cultivar had the highest (51%) and Naz single-branched cultivar had the lowest (47%) oil content. In general, the results showed that in full irrigation treatment, nitrogen fertilizer application for all three cultivars can be justified; In contrast, in low irrigation conditions and none of the cultivars, grain yield higher than 500 kg N ha^-1 was not achieved even with high amounts of nitrogen (60 and 120 kg N ha^-1). https://ijfcs.ut.ac.ir/article_89665_25589756b52004b204dfe02c5e64b7d3.pdf