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Aggregate Sizes and Stability in Cultivated South Dakota Prairie Ustolls and Usterts

^a 247A NPB, South Dakota State Univ., Box 2410C, Brookings, SD 57007-2141
^b USDA-ARS, 803 Iowa Ave., Morris, MN 56267

View larger version (25K): [in a new window]   Fig. 1. Mean structural grade rating as a function of soil depth in Ustolls (N = 6) and Usterts (N = 2) of central South Dakota. Asterisk (*) indicates a significant difference between grass and cultivated soils P < 0.05. Plus (+) indicates a significant difference between no-till and till soils P < 0.05.