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Soil Aggregation and Carbon and Nitrogen Storage under Soybean Cropping Sequences

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

View larger version (43K): [in a new window]   Fig. 1. Soil organic carbon (SOC) and organic nitrogen (SON) concentrations at the 0- to 5-cm and 5- to 15-cm soil depths. CT and NT refer to conventional and no-tillage management. SWS, WS, and soybean denote sorghum/wheat/soybean, wheat/soybean, and continuous soybean sequences, respectively. Error bars represent the standard error of the mean.

View larger version (61K): [in a new window]   Fig. 2. The percentages of aggregate-size fractions of whole soil as influenced by tillage and cropping sequences at the 0- to 5-cm and 5- to 15-cm soil depths. CT and NT refer to conventional and no-tillage management. SWS, WS, and soybean denote sorghum/wheat/soybean, wheat/soybean, and continuous soybean sequences, respectively. Error bars represent the standard error of the mean.

View larger version (62K): [in a new window]   Fig. 3. Sand-free soil organic carbon (SOC) concentrations of four aggregate-size fractions at the 0- to 5-cm and 5- to 15-cm soil depths. CT and NT refer to conventional and no-tillage management. SWS, WS, and soybean denote sorghum/wheat/soybean, wheat/soybean, and continuous soybean sequences, respectively. Error bars represent the standard error of the mean.

View larger version (59K): [in a new window]   Fig. 4. Sand-free soil organic nitrogen (SON) concentrations of four aggregate-size fractions at the 0- to 5-cm and 5- to 15-cm soil depths. CT and NT refer to conventional and no-tillage management. SWS, WS, and soybean denote sorghum/wheat/soybean, wheat/soybean, and continuous soybean sequences, respectively. Error bars represent the standard error of the mean.

View larger version (52K): [in a new window]   Fig. 5. Soil organic carbon (SOC) and organic nitrogen (SON) storage at the 0- to 5-cm and 5- to 15-cm soil depths. CT and NT refer to conventional and no-tillage management. SWS, WS, and soybean denote sorghum/wheat/soybean, wheat/soybean, and continuous soybean sequences, respectively. Error bars represent the standard error of the mean.

View larger version (51K): [in a new window]   Fig. 6. Partitioning of soil organic carbon (SOC) storage among aggregate-size fractions at the 0- to 5-cm and 5- to 15-cm soil depths. CT and NT refer to conventional and no-tillage management. SWS, WS, and soybean denote sorghum/wheat/soybean, wheat/soybean, and continuous soybean sequences, respectively. Error bars represent the standard error of the mean.

View larger version (41K): [in a new window]   Fig. 7. Partitioning of soil organic nitrogen (SON) storage among aggregate-size fractions at the 0- to 5-cm and 5- to 15-cm soil depths. CT and NT refer to conventional and no-tillage management. SWS, WS, and soybean denote sorghum/wheat/soybean, wheat/soybean, and continuous soybean sequences, respectively. Error bars represent the standard error of the mean.