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Soil Carbon and Nitrogen Storage in Aggregates from Different Tillage and Crop Regimes

Dep. of Soil and Crop Sciences, Texas A&M Univ., 2474 TAMU, College Station, TX 77843-2474

View larger version (42K): [in a new window]   Fig. 1. Distribution of soil aggregates in sorghum, wheat, and soybean monocultures under no-tillage (NT) and conventional tillage (CT) at 0- to 5- and 5- to 15-cm depths. Error bars represent the standard error of the mean.

View larger version (37K): [in a new window]   Fig. 2. Soil organic C and N concentrations (g kg–1) in sorghum, wheat, and soybean monocultures under no-tillage (NT) and conventional tillage (CT) at 0- to 5- and 5- to 15-cm depths. Error bars represent the standard error of the mean.

View larger version (35K): [in a new window]   Fig. 3. Soil organic C and N (Mg ha–1) in sorghum, wheat, and soybean monocultures under no-tillage (NT) and conventional tillage (CT) at 0- to 5- and 5- to 15-cm depths. Error bars represent the standard error of the mean.

View larger version (34K): [in a new window]   Fig. 4. Distribution of soil organic C (Mg C ha–1) among aggregate-size fractions in sorghum, wheat, and soybean monocultures under no-tillage (NT) and conventional tillage (CT) at 0- to 5- and 5- to 15-cm depths. Error bars represent the standard error of the mean.

View larger version (38K): [in a new window]   Fig. 5. Distribution of soil organic N (Mg N ha–1) among aggregate-size fractions in sorghum, wheat, and soybean monocultures under no-tillage (NT) and conventional tillage (CT) at 0- to 5- and 5- to 15-cm depths. Error bars represent the standard error of the mean.