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Saturated Hydraulic Conductivity of Semiarid Soils

Combined Effects of Salinity, Sodicity, and Rate of Wetting

^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

View larger version (27K): [in a new window]   Fig. 1. Bulk density of the dry and wet soil samples in the columns as a function of clay content.

View larger version (22K): [in a new window]   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.

View larger version (21K): [in a new window]   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.

View larger version (45K): [in a new window]   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.

View larger version (14K): [in a new window]   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.

View larger version (13K): [in a new window]   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.

View larger version (13K): [in a new window]   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.

View larger version (15K): [in a new window]   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.