Evaluation of conjunctive water use impacts on soil hydraulic properties and root water uptake using HYDRUS-3D model

摘要

The impacts of using different water qualities conjunctively on soil hydraulic properties and root water uptake are vital for proper water management at the field level. Different scenarios were used to simulate water and solute transport in the root zone (within 100 cm) below ground surface in two farm field in Diyala governorate namely Al-Khuyls and Al-Hashmyat farm fields. The following scenarios were used: freshwater all season long, groundwater all season long, freshwater-groundwater all season long, and freshwater-freshwater-groundwater all season long. It has been found that the hydraulic properties between (pressure head-water content, and pressure head-hydraulic conductivity) have no significant change throughout the course of the irrigation season. A significant change has been found in root water uptake, water content and pressure head in two fields.