University of Khartoum

Polymer Effects on The Hydraulic Conductivity of Saline And Sodic Soil Conditions

Polymer Effects on The Hydraulic Conductivity of Saline And Sodic Soil Conditions

Show full item record

Title: Polymer Effects on The Hydraulic Conductivity of Saline And Sodic Soil Conditions
Author: Malik,Nasr Malik
Abstract: Water used for irrigation in many sem-iarid regions of the world contains high levels of salinity and/or sodicity which affect hydraulic conductivity. Polymers mixed with the irrigation water may affect hydraulic conductivity. The hydraulic con-ductivity of a Haplic Durixeralfs soil clas-sified as Arlington sandy loam was meas-ured in disturbed laboratory columns using waters of various electrolyte concentra-tions, sodium adsorption ratios, and with or without a polymer. Cationic polysaccha-ride, guar derivative (CP-14), and very low negative charge polyacrylamide (2J) polymers were investigated. After passing several pore volumes of water through the soil, the soil was removed from the column, dried, sieved, and repacked into the col-umns. The hydraulic conductivity was then measured using city of Riverside, CA tap water. The greatest increase in hydraulic conductivity with CP-14 compared to the control occurred with SAR equal to 5 and at the two highest electrolyte concentra-tions. The 2J polymer was most effective in increasing hydraulic conductivity when it was added to the high electrolyte solu-tion. During the second run with tap water, the hydraulic conductivity for no polymer and CP-14 treatments were similar to each other and less than the 2J treatment. The polyacrylamide apparently promoted ag-gregate stability to the soil when it is dried, whereas the guar did not. This behavior may be caused by the high molecular weight of the polyacrylamide.
URI: http://hdl.handle.net/123456789/6872
Date: 1991


Files in this item

Files Size Format View

This item appears in the following Collection(s)

Show full item record

Share

Search DSpace


Browse

My Account