Influence of Interlayer Soil on the Water Infiltration Characteristics of Heavy Saline–Alkali Soil in Southern Xinjiang

Interlayer soil is common in southern Xinjiang, because interlayer can reduce the infiltration rate of water. To simulate heavy saline–alkali cotton fields, this paper adopted a vertical one-dimensional test. T1 (315 mm), T2 (270 and T3 (225 mm) different positions (T5, 315 thicknesses (T6, with same irrigation volume, as well one perforation sand filling treatment (T4, were set. The influence amounts, locations, injection on water was analyzed. analysis results showed that increase amount, migration distance wet front increased, but did not penetrate to bottom (90 cm). Under thickness (T6) compared position (T5), change moisture content upper lower layers greater, advance time wetting cumulative slightly higher. After tunneling (T4), reduced, profile each layer improved. Kostiakov model could better characteristics configurations heavily land. all treatments, only reached 100 cm T4 treatment, maximum 87.8 other indicating too little or upward movement thickening conducive infiltration. For area land appropriate should be more than mm. drilling first then used simple effective measure soil, thus applied layered structure 60–80 cm.