Research of Stand-hole Drainage Salinity Technology for the Saline-alkali Soil with Clay Interlayer

According to the situation on back-salinity at clay interlayer in Gansu Shule River irrigation area,the improvement technology on drainage salinity through stand-hole was suggested to adopt in Shule River irrigation area.Based on the test of drainage salinity effect in different clay interlayer and the analsis of thickness of drainage salinity layer,the design parameter of effective drainage salinity semidiameter,amount of sand-hole and semidiameter of hole were put forword.