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10834. Blank, R.R. and M.A. Fosberg. 1989. Cultivated and adjacent virgins soils in northcentral South Dakota: I. Chemical and physical comparisons.. Soil Sci. Soc. Amer. J. 53:1484-1490.
Both surface and subsurface horizons were examined for the effects of cultivation. When similar horizons were compared, the following chemical differences were noted: 1) organic C content was 26% less in Ap of cultivated; 2) water-soluble Si was 49, 46 and 21% greater in A, Bt, and Btk horizons of cultivated pedons respectively; 30 water soluble Mg, Na, and K were 42, 32, and 18% lower in C horizons of cultivated pedons respectively. For physical properties, bulk density was 18% greater in cultivated Ap horizons and they contained 38% more very fine sand and 10% less silt. A and Btk virgin horizons had greater wet aggregate stability, and virgin A horizons averaged 30% more water retained at 0 MPa tension.