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Soil Water Repellency Induced By Long-Term Irrigation with Treated Sewage Effluent

^a Department of Soil and Water Sciences, Faculty of Agricultural, Food, and Environmental Quality Sciences, Hebrew University of Jerusalem, Rehovot 76100 Israel
^b Institute of Soil, Water and Environmental Sciences, The Volcani Center, Agricultural Research Organization (ARO), Bet Dagan 50250 Israel

View larger version (20K): [in a new window]   Fig. 1. The abscissa represents water drop penetration time (WDPT) in log scale, and the ordinate represents the average depth of each 1-cm slice below ground surface. Individual results are denoted by small solid markers, while the average WDPT of the layer is denoted by a large, open similar marker. The squares represent 0 to 1 cm, circles 1 to 2 cm, triangles 2 to 3 cm, inverted triangles 3 to 4 cm, and diamonds 4 to 5 cm. The vertical dotted lines indicate the boundaries between the different repellency classes as defined in the text.

View larger version (54K): [in a new window]   Fig. 2. Spatial distribution of water drop penetration time (WDPT) in seconds for two 0- to 5-cm transects from Plot 123 in (a) October 2003 and (b) March 2004.

View larger version (26K): [in a new window]   Fig. 3. Moisture content (MC) and organic matter content (OM) for Plot 123 (effluent-irrigated) transects.

View larger version (32K): [in a new window]   Fig. 4. Organic matter content (OM) versus water drop penetration time (WDPT) for the different layer slices.

View larger version (59K): [in a new window]   Fig. 5. Relative frequency of water drop penetration time (WDPT) repellency class histograms for (a) Plot 142, tap water–irrigated, November 2003, and (b) Plot 123, effluent-irrigated, October 2003.

View larger version (17K): [in a new window]   Fig. 6. Moisture content (MC) and organic matter content (OM) for tap water–irrigated Plots (a) 140 and (b) 142.

View larger version (77K): [in a new window]   Fig. 7. Volumetric moisture content across 0- to 50-cm-deep transects from Plot 123 in (a) October 2002 and (b) March 2003.

View larger version (44K): [in a new window]   Fig. 8. Organic matter content (OM) distribution in 0- to 50-cm-deep transects from Plot 123 in (a) October 2002 and (b) March 2003.

View larger version (18K): [in a new window]   Fig. 9. Bulk density versus volumetric water content for 0- to 50-cm-deep transects from Plot 123 in (a) October 2002 and (b) March 2003.