Pedosphere 22(5): 681--688, 2012
ISSN 1002-0160/CN 32-1315/P
©2012 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Soil Erosion as A ffected by Polyacrylamide Application Under Simulated Furrow Irrigation with Saline Water
DOU Chao-Yin1, LI Fa-Hu1,2, L. S. WU3
1.College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China2.State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Yangling 712100, China3.Department of Environmental Sciences, University of California, Riverside 92521, USA
ABSTRACT
      The reduction of soil and water losses under furrow irrigation with saline water is important to environmental protection and agricultural production.The objective of this study was to determine the effect of polyacrylamide(PAM)application on soil infiltration and erosion under simulated furrow irrigation with saline water.Polyacrylamide was applied by dissolving it in irrigation water at the rates of 1.5,7.5,and 15.0 mg L-1 or spreading it as a powder on soil surface at the rates of 0.3,1.5,3.0,and 6.0 g m-2,respectively.The effectrolyte concentration of tested irrigation water was 10 and 30 mmolc L-1 and its sodium adsorption ratio(SAR)was 0.5,10.0,and 20.0(mmolc L-1)0.5.Distilled water was used as a control for irrigation water quality.Results indicated that the effectrolyte concentration and SAR generally did not significantly affect soil and water losses after PAM application.Infiltration rate and total infiltration volume decreased with the increase of PAM application rate.Polyacrylamide application in both methods significantly reduced soil erosion,but PAM application rate did not significantly affect it.The solution PAM application was more effective in controlling soil erosion than the powdered PAM application,but the former exerted a greater adverse influence on soil infiltration than the latter.Under the same total amounts,the powdered PAM application resulted in a 38.2%-139.6% greater infiltration volume but a soil mass loss of 1.3-3.4 times greater than the solution PAM application.
Key Words:  effectrolyte concentration,sodium adsorption rati,soil infiltration,soil loss,water loss
Citation: Dou, C. Y., Li, F. H. and Wu, L. S. 2012. Soil Erosion as A ffected by Polyacrylamide Application Under Simulated Furrow Irrigation with Saline Water. Pedosphere. 22(5): 681-688.
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