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Aggregate Stability as Affected by Polyacrylamide Molecular Weight, Soil Texture, and Water Quality

^a USDA-ARS, National Soil Erosion Research Lab., 275 S. Russell St., Purdue Univ., West Lafayette, IN 47907-2077
^b current address: Wind Erosion Research Unit, USDA-ARS-NPA, Manhattan, KS, 66502
^c Univ. of Regensburg, Dep. of Landscape Ecology and Soil Science, Regensburg, Germany
^d Institute of Soil, Water and Environmental Sciences, ARO, The Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel

View larger version (20K): [in this window] [in a new window]   Fig. 1. (a) Moisture release and (b) specific water capacity curves for the loam and clay-Y soils (0.5–1.0 mm aggregates) for fast and slow wetting rates (WR) with deionized water. The curve for ethanol represents data for both fast and slow wetting.

View larger version (22K): [in this window] [in a new window]   Fig. 2. (a) Moisture release and (b) specific water capacity curves for loam and clay-Y soils (control and treated with high-molecular-weight polyacrylamide, PAM(H), 0.5–1.0-mm aggregates) for fast wetting with deionized water (DW) and gypsum solution (GS).

View larger version (29K): [in this window] [in a new window]   Fig. 3. Volume of drainable porosity (VDP) as a function of polyacrylamide (PAM) molecular weight for 0.5- to 1.0- and 1.0- to 2.0-mm aggregate size and either deionized water (DW) or gypsum solution (GS). For a given soil, columns labeled with same letter are not significantly different at the P < 0.05 level. PAM(H) = high-molecular-weight PAM; PAM(M) = moderate-molecular-weight PAM.

View larger version (29K): [in this window] [in a new window]   Fig. 4. Stability ratio of soils as a function of polyacrylamide (PAM) molecular weight [high molecular weight PAM(H) or moderate molecular weight PAM(M)], aggregate size (0.5- to 1.0- or 1.0- to 2.0-mm) and water quality (deionized water [DW] or gypsum solution [GS]). For a given soil, columns labeled with same letter are not significantly different at the P < 0.05 level.