University of Tehran Press Iranian Journal of Soil and Water Research 2008-479X 54 8 2023 10 23 The Effect of installation depth and discharge of dripper on soil salinity distribution in subsurface drip irrigation of sugarcane The Effect of installation depth and discharge of dripper on soil salinity distribution in subsurface drip irrigation of sugarcane 1159 1177 93714 10.22059/ijswr.2023.361603.669523 FA Elham Zanganeh-Yusef Abadi Department of Irrigation and Drainage, Faculty of Water and Environment Engineering, Shahid Chamran University of Ahvaz 0000-0002-3456-5312 Abdali Naseri Professor. Department of Irrigation and Drainage, Faculty of Water and Environment Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran 0000-0002-5833-5802 Abdolrahim Hooshmand Associate Professor, Department of Irrigation and Drainage, Faculty of Water and Environment Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran 0000-0002-5722-5054 Saeed BoroomandNasab Professor. Department of Irrigation and Drainage, Faculty of Water and Environment Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran 0000-0002-4066-6240 Journal Article 2023 07 02 The purpose of this study was to investigate the effect of the depth of application and the discharge of drippers on the distribution of soil salinity in the sugarcane field under subsurface drip irrigation. This research was conducted as a split-plot experiment based on complete random blocks design in four replications. Experimental treatments including two dripper distances on the secondary pipe (including L1: 30 cm with a flow rate of 2.2 L h^-1 and L2: 50 cm with a flow rate of 3.8 L h^-1) and three dripper placement depths (Including D1: 15 cm, D2: 25 cm and D3: 35 cm). In order to investigate the effect of different treatments on salinity distribution in the soil, soil samples were collected four and six months after the start of subsurface drip irrigation, from the soil around the drippers at different intervals. The results of the salinity distribution pattern showed that under the conditions of subsurface drip irrigation, the highest salinity was observed in the bottom of the furrow and in the upper layer of the soil on the mound. Six months after the start of subsurface drip irrigation, the salinity of the soil profile in all treatments increased compared to the beggining, so that the salinity of the area around the drippers in most of the treatments reached above 3 dS m-1. The highest amount of salinity in the upper soil layers was observed in D3L2 treatment. Also, the most favorable salinity distribution pattern in the root development area was observed in D2L1 treatment. Therefore, it can be concluded that the use of drippers at a depth of 25 cm with intervals of 30 cm and a flow rate of 2.2 L h^-1 is more suitable for managing soil salinity in the subsurface drip irrigation system. The purpose of this study was to investigate the effect of the depth of application and the discharge of drippers on the distribution of soil salinity in the sugarcane field under subsurface drip irrigation. This research was conducted as a split-plot experiment based on complete random blocks design in four replications. Experimental treatments including two dripper distances on the secondary pipe (including L1: 30 cm with a flow rate of 2.2 L h^-1 and L2: 50 cm with a flow rate of 3.8 L h^-1) and three dripper placement depths (Including D1: 15 cm, D2: 25 cm and D3: 35 cm). In order to investigate the effect of different treatments on salinity distribution in the soil, soil samples were collected four and six months after the start of subsurface drip irrigation, from the soil around the drippers at different intervals. The results of the salinity distribution pattern showed that under the conditions of subsurface drip irrigation, the highest salinity was observed in the bottom of the furrow and in the upper layer of the soil on the mound. Six months after the start of subsurface drip irrigation, the salinity of the soil profile in all treatments increased compared to the beggining, so that the salinity of the area around the drippers in most of the treatments reached above 3 dS m-1. The highest amount of salinity in the upper soil layers was observed in D3L2 treatment. Also, the most favorable salinity distribution pattern in the root development area was observed in D2L1 treatment. Therefore, it can be concluded that the use of drippers at a depth of 25 cm with intervals of 30 cm and a flow rate of 2.2 L h^-1 is more suitable for managing soil salinity in the subsurface drip irrigation system. https://ijswr.ut.ac.ir/article_93714_12abb7d08e46c6e6482d040daf69e00a.pdf