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Gypsum Effect on the Aggregate Size and Geometry of Three Sodic Soils Under Reclamation

U.S. Salinity Laboratory, Riverside, CA

View larger version (156K): [in a new window]   Fig. 1. Thin section micrograph from soil in Column 9. Multipoint chemical analysis using energy dispersive x-ray analysis (EDXA) is marked with arrows, chemical results are as follows(the percentages are noted SiO2, Al2O3, CaO, K2O, and FeO, respectively): No. 1., 56.02, 10.16, 9.43, 3.51, 20.30; No. 2., 60.70, 24.23, 2.85, 7.84, 4.19; No. 3., 60.20, 15.57, 2.03, 7.57, 14.01; and No 4., 96.62, 1.34, 0.78, 0.77, 1.19.

View larger version (12K): [in a new window]   Fig. 2. Area of the aggregates as a function of the exchangeable Na percentage (ESP).

View larger version (23K): [in a new window]   Fig. 3. Aggregate-size distribution for Hanford Soil 3 when 1 gypsum requirement (GR) was added (Column 12) and when no gypsum was added (Column 9).

View larger version (11K): [in a new window]   Fig. 4. Relationship between exchangeable Na percentage (ESP) and saturated hydraulic conductivity (Ksat) for Hanford, Las Animas, and Madera soils.

View larger version (13K): [in a new window]   Fig. 5. Relationship between aggregate size expressed as aggregate area, A, divided by aggregate perimeter, P. Both A and P were measured in the micrographs using image analysis.