In semi-arid regions, the primary factors controlling the distribution of soil water and nitrate are soil texture and field management. However, determining the distribution of water and nitrates, as well as their impacts on water and crop productivity under combined management of irrigation and nitrogen practices, considering different soil texture types, remains challenging in the semi-arid region of Iraq. To overcome these challenges, this research was conducted to identify suitable combined field practices of irrigation systems and nitrogen applications, across different soil texture types, that could reduce soil water and nitrate leaching while promoting water and barley productivity using the Root Zone Water Quality Model (RZWQM2). Field experiments and model simulations were utilized for different textural soils [Silty clay (SiC) and Sandy clay (SC)], two irrigation systems of (sprinkler and flooding), and two nitrogen application rates (100 and 200 kg N ha-1) during the 2020-2021 and 2021-2022 barley cultivation seasons, in western Baghdad, Iraq. The SC texture yielded a higher average soil water and nitrate flux toward groundwater, with increases of 6% and 32%, respectively. Combined sprinkler irrigation with a high nitrogen rate produced higher crop yield and water use efficiency, with 4% and 10% increases, respectively. The combination of a high nitrogen rate with a sprinkler irrigation system was the optimal field practice for enhancing soil water and nitrate distribution as well as water and barley productivity for both soil textures in the Iraqi semi-arid region.