The objective of this review paper is to compare methods currently used to evaluate the effects of soil erosion on soil properties and crop yields on cultivated soils. The methods include (i) topsoil removal and additions, (ii) paired comparisons between eroded phases of soils within field on a similar landscape position, (iii) analyzing yield data for a soil series from many plots in numerous fields with variable management and on different landscape positions, (iv) factor analyses and geostatistics, and (v) simulation models such as Erosion Productivity Impact Calculator (EPIC) and Nitrogen-Tillage Residue Model (NTRM). Each method has inherent strength, weakness, and bias which can result in the measured soil productivity response attributed to erosion being potentially confounded with other variables such as landscape position, soil formation and management.
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Olson et al. (1994) studied this question.
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