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Management Practice Effects on Surface Total Carbon

Differences in Spatial Variability Patterns

^a Dep. of Crop and Soil Sciences, Michigan State Univ., East Lansing, MI 48824-1325
^b W.K. Kellogg Biological Station and Dep. of Crop and Soil Sciences, Michigan State Univ., Hickory Corners, MI 49060-9516
^c Dep. of Crop Sciences, Univ. of Illinois at Urbana-Champaign, Urbana, IL 61801

View larger version (35K): [in a new window]   Fig. 1. Locations of the experimental plots along with an example of the soil sampling scheme used within each plot and the 4 by 4 m interpolated elevation map.

View larger version (15K): [in a new window]   Fig. 2. Sample variograms and variogram models for: (a) original total C data; (b) residuals from topographical regression models; and (c) residuals from regression models with topographical variables and texture in conventional chisel-plow (CT), no-till (NT), and organic chisel-plow with cover cropping (CT-cover) management systems. Model parameters are shown in Table 2.