Soil Salinity Removal Affected by Irrigation Quantity Under Indirect Subsurface Drip Irrigation

In order to study the transportation and distribution characteristics of soil salinity under indirect subsurface drip irrigation,a field experiment is designed to analyze the soil salinity removal affected by irrigation quantity on jujube root zone.The results show that too big or too small irrigation water quantity is not suitable for soil salt leaching,while under the appropriate irrigation water quantity,indirect subsurface drip irrigation has good salt suppression effect to 0~50cm soil layer;The leaching Ca2+,Mg2+amounts decrease with the increase of irrigation quantity under certain water-conducting device diameter(D=75mm)after singer drip irrigation;The leaching HCO-3,Cl-amounts are the highest with suitable irrigation quantity of 13 L,and the SO2-4 concentration can be decreased only under larger irrigation quantity.