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Published online 12 March 2007
Published in Soil Sci Soc Am J 71:406-412 (2007)
DOI: 10.2136/sssaj2006.0138
© 2007 Soil Science Society of America
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Water Retention and Hydraulic Conductivity of Cross-Linked Polyacrylamides in Sandy Soils

A. K. Bhardwaj, I. Shainberg, D. Goldstein, D. N. Warrington and G. J.Levy*

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


Figure 1
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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.

 

Figure 2
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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).

 

Figure 3
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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)

 

Figure 4
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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.

 

Figure 5
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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.

 

Figure 6
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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.

 





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