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Restoration of Microbial Residues in Soils of the Conservation Reserve Program

^a Inst. of Soil Science and Soil Geography, Univ. of Bayreuth, D-95440 Bayreuth, Germany
^b Natural Resources Conservation Service, 100 Centennial Mall North, Lincoln, NE 68516
^c USDA-ARS, Soil-Plant-Nutrient Research, 301 S. Howes St., P.O. Box E, Fort Collins, CO 80522-0470

View larger version (28K): [in a new window]   Fig. 1. Average N (left black bars) and amino sugar concentration (right lined bars) in the surface soil (0–5 cm) of the prairie, Conservation Reserve Program (CRP) and cropland fields under study. Different letters (a–b, c–e) indicate significant difference among land-use systems at the P < 0.05 level of probability using ANOVA and the respective relative concentrations (normalized to N or the amino sugar content of the prairie) as input parameters.

View larger version (21K): [in a new window]   Fig. 2. Relative increase in the ratio of glucosamine to galactosamine in the surface soil (0–5 cm) after long-term cropping of the prairie.

View larger version (29K): [in a new window]   Fig. 3. Changes in the ratio of glucosamine to muramic acid with land use as related to bulk density (0–5 cm).