Fig. 5 Concentration of SOM present as total amino sugars (A) and glucosamine (B) as related to the TOC content in the aggregate-size classes <53 µm (), 53 to 250 mm (), 250 to 2000 mm (), and 2000 to 8000 mm () of the conventional (CT) and no-tillage soils (NT) at Sidney, NE and Lexington, KY. Mean values with standard errors are shown, n = 3. Pairs of bars with the same letter signify no sigificant difference at P < 0.05 between the aggregate-size classes. Values of the NT treatment with * are significantly different than corresponding values of the CT plots at P < 0.05