Equations to predict measures of structural stability at minimum strength
1994
The objective of this study was to develop a procedure to predict the maximum potential amount of clay dispersible from soils during wetting. Information in the literature on the relationship between soil water content at sampling (Θ) and dispersible clay (DC) and that between Θ and wet aggregate stability for 10 different soils was used to develop extrapolation equations. The Θ at which DC became maximum (defined Θmax) ranged from 0.34 to 0.54 kg kg, and it increased with increasing clay and organic matter contents (R = 0.56). The DCmax, defined as the amount of clay that will disperse at Θmax, ranged from 3.22 to 20.05 g clay 100 g soil. The DCmax increased with increasing clay and decreasing organic matter contents (R = 0.92). Decreases in organic matter content brought about larger increases in DCmax in a clay soil than in a loam
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