Hydraulic conductivity characteristics of rootzones at different ratios of sand to soil

Hydraulic conductivity characteristics of rootzones and influencing rules of different ratios of sand to soil were studied by stable water suction under saturated condition.The results were analyzed synthetically according to the recommended standard of sports turf and difference level.The main results are as follows:with sand content increasing,saturated hydraulic conductivity was increased exponentially,not only at undisturbed rootzones but also at disturbed rootzones.When sand/soil ratio exceeded 7∶3(sand content more than 80%),saturated hydraulic conductivity was increased evidently.Before being turfed and after two month,steady infiltration rate shows the same trend with saturated hydraulic conductivity and both have a distinct linear relationship.According to the difference level,11 treatments were divided three groups.First group was the sand/soil ratio of less than 3∶7(sand content lower than 60%),second group was the sand/soil ratio from 3∶7 to 7∶3(sand content between 60% and 80%) and third group was the sand/soil ratio of more than 7∶3(sand content more than 80%).