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Soil Structure and Soil Organic Matter

II. A Normalized Stability Index and the Effect of Mineralogy

Natural Resource Ecology Lab., Colorado State Univ., Fort Collins, CO 80523 USA

View larger version (26K): [in a new window]   Fig. 1 Mean weight diameter (MWD) of rewetted soils from four long-term agricultural experiment field sites with a native vegetation (NV), no-tillage (NT), and conventional tillage (CT) treatment. Values followed by a different letter within a site are significantly different. Values followed by * in 5- to 20-cm depth are significantly different from corresponding values in 0- to 5-cm depth. Statistical significance determined at P < 0.05 according to Tukey's HSD mean separation test

View larger version (17K): [in a new window]   Fig. 2 Mean weight diameter (MWD) of slaked soils from four long-term agricultural experiment field sites with a native vegetation (NV), no-tillage (NT), and conventional tillage (CT) treatment. Values followed by a different letter within a site are significantly different. Values followed by * in 5- to 20-cm depth are significantly different from corresponding values in 0- to 5-cm depth. Statistical significance determined at P < 0.05 according to Tukey's HSD mean separation test

View larger version (27K): [in a new window]   Fig. 3 Normalized stability index (NSI) of soils from four long-term agricultural experiment field sites with a native vegetation (NV), no-tillage (NT), and conventional tillage (CT) treatment. Values followed by a different letter within a site are significantly different. Values followed by * in 5- to 20-cm depth are significantly different from corresponding values in 0- to 5-cm depth. Statistical significance determined at P < 0.05 according to Tukey's HSD mean separation test