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Published online 1 January 2007
Published in Soil Sci Soc Am J 71:145-154 (2007)
DOI: 10.2136/sssaj2005.0231
© 2007 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Corn-Soybean Sequence and Tillage Effects on Soil Carbon Dynamics and Storage

D. R. Huggins*

USDA-ARS, Washington State University, Pullman, WA 99164

R. R. Allmaras (deceased) and C. E. Clapp

USDA-ARS, Dep. of Soil, Water and Climate, University of Minnesota, St. Paul, MN 55108

J. A. Lamb

Dep. of Soil, Water and Climate, University of Minnesota, St. Paul, MN, 55108

G. W. Randall

Southern Minnesota Res. and Ext. Center, University of Minnesota, Waseca, MN, 56093


Figure 1
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  		Fig. 1. Tillage and crop sequence effects on total soil organic C (0–45 cm), C4–derived SOC (0–45 cm), C3–derived SOC (0–45 cm) and relationship to estimated C return. Regression equations were omitted for relationships where parameters (slope) were not statistically significant from 0.

 

Figure 2
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  		Fig. 2. Thirty year simulation of tillage and crop sequence effects on total soil organic C, C4–derived SOC and C3–derived SOC. Solid lines depict 14-yr period of study while dashed lines show continued simulations from 15 to 30 yr.

 




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