Abstract

The inherent erodibility of twenty soils was indexed using Middleton's dispersion ratio and Anderson's surface-aggregation ratio. These indices were then used as dependent variables for several regression analyses. The milliequivalents per 100 grams of oven-dried soil for the four most plentiful soil cations (Ca, Mg, K, and Na) were determined and then used as independent variables in the regressions. The best fit to the data was found to be an equation of the type: Both the linear and the curvilinear terms were significant at the arbitrarily selected 5 per cent level.

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