Reusing drainage water for leaching of saline and sodic soils in the Khuzestan province, Iran

Abstract

This study investigates the feasibility of utilizing drainage water for reclamation of saline and sodic soils in the Dosalagh plain of Khuzestan province, Iran. With significant drainage water generated in the region's irrigation networks, repurposing it for soil reclamation emerges is a low-risk strategy. Leaching, a practical technique for soil desalination, was examined using the double ring method at depths up to 150 cm. Four water qualities (electrical conductivities of 2.12, 7, 25 and 40 dS m−1) and depths (0, 25, 50 and 75 cm) were tested, with intermittent leaching over three cycles. Results indicate a substantial reduction in electrical conductivity (117.7 to 29 dS m−1) and sodium content (1415.9 to 39.83 mEq L−1) at the 0-25 cm depth with drainage water incorporation. The study highlights the beneficial impact on soil quality, emphasizing decreased sodium content, sodium adsorption ratio, and electrical conductivity. Overall, reusing drainage water proves advantageous for soils with high salinity levels, showcasing its potential for sustainable soil management in saline regions. This research underscores the importance of effective drainage water management for soil reclamation and agricultural sustainability in arid regions like Khuzestan province. HIGHLIGHTS Soil electrical conductivity (EC) decreased by increasing the depth of leaching water.; By increasing the depth of water in the leaching process, the amount of soil sodium and chloride decreased.; The combination of saline drainage water and non-saline river water is suitable for irrigation and reducing soil salinity.; The amount of EC reduction was more than exchangeable sodium percentage reduction.;

Keywords

• desalinization
• electrical conductivity
• reclamation
• sodium adsorption ratio