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Water Retention and Hydraulic Conductivity of Cross-Linked Polyacrylamides in Sandy Soils

Institute of Soil, Water and Environmental Sciences, Agricultural Research Organization (ARO), The Volcani Center, P.O. Box 6, Bet Dagan 50-250, Israel

View larger version (36K): [in this window] [in a new window]   Fig. 1. Water retention characteristics of polymers under free swelling conditions for suction ranging between 0 and 50 cm water potential head. Numbers in parentheses indicate size range of polymer granules.

View larger version (29K): [in this window] [in a new window]   Fig. 2. Water retention or absorption characteristics of the polymers (per unit polymer) for three application rates (0.5, 2.5, and 5.0 g kg–1).

View larger version (33K): [in this window] [in a new window]   Fig. 3. Water retention or absorption characteristics of the polymers (per unit polymer) for three application rates (0.5, 2.5, and 5.0 g kg–1)

View larger version (24K): [in this window] [in a new window]   Fig. 4. Changes in the height (dx) of a saturated mixture of soil with 5 g kg–1 Stockosorb 500 Micro during leaching with tap water and subsequently with distilled water for the two wetting rates. Bars indicate ± one standard deviation.

View larger version (35K): [in this window] [in a new window]   Fig. 5. Relative hydraulic conductivity of soil–polymer mixtures with tap water for the two wetting rates (WR) as a function of leachate volume for the different polymers. Bars indicate ± one standard deviation.

View larger version (25K): [in this window] [in a new window]   Fig. 6. Relative hydraulic conductivity of soil–polymer mixtures with distilled water and three application rates as a function of leachate volume for the different polymers. Bars indicate ± one standard deviation.