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Published online 11 April 2005
Published in Soil Sci Soc Am J 69:653-662 (2005)
DOI: 10.2136/sssaj2004.0232
© 2005 Soil Science Society of America
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Saturated Hydraulic Conductivity of Semiarid Soils

Combined Effects of Salinity, Sodicity, and Rate of Wetting

G. J. Levya, D. Goldsteina and A. I. Mamedovb,*

a Institute of Soil, Water and Environmental Sciences, Agricultural Research Organization (ARO), The Volcani Center, P.O. Box 6, Bet-Dagan 50-250, Israel
b USDA-ARS-MWA, National Soil Erosion Research Laboratory, West Lafayette, IN 47907



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Fig. 1. Bulk density of the dry and wet soil samples in the columns as a function of clay content.

 


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Fig. 2. Initial (HCo) and steady state (HCss) hydraulic conductivity as a function of clay content for the 60 samples subjected to fast wetting and leaching with distilled water.

 


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Fig. 3. Initial hydraulic conductivity (HCo) as a function of exchangeable sodium percentage (ESP) for the 60 samples subjected to fast wetting and leaching with distilled water. Data are presented for each soil type separately.

 


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Fig. 4. Initial hydraulic conductivity (HCo) as a function of exchangeable sodium percentage (ESP), water quality, and rate of wetting for the selected soil samples studied. Bars indicate a single confidence interval value at P = 0.05. DW = distilled water, SW = saline water.

 


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Fig. 5. Relative hydraulic conductivity at steady state (RHC) in the loamy sand as a function of exchangeable sodium percentage (ESP), water quality, and rate of wetting: (a) distilled water (DW) treatment; (b) saline water (SW) treatment. Bars indicate a single confidence interval value at P = 0.05.

 


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Fig. 6. Relative hydraulic conductivity at steady state (RHC) in the loam as a function of exchangeable sodium percentage (ESP), water quality, and rate of wetting: (a) distilled water (DW) treatment; (b) saline water (SW) treatment. Bars indicate a single confidence interval value at P = 0.05.

 


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Fig. 7. Relative hydraulic conductivity at steady state (RHC) in the sandy clay as a function of exchangeable sodium percentage (ESP), water quality and rate of wetting: (a) distilled water (DW) treatment; (b) saline water (SW) treatment. Bars indicate a single confidence interval value at P = 0.05.

 


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Fig. 8. Relative hydraulic conductivity at steady state (RHC) in the clay as a function of exchangeable sodium percentage (ESP), water quality and rate of wetting: (a) distilled water (DW) treatment; (b) saline water (SW) treatment. Bars indicate a single confidence interval value at P = 0.05.

 





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