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Published online 6 July 2006
Published in J Environ Qual 35:1608-1619 (2006)
DOI: 10.2134/jeq2005.0259
© 2006 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Simulating Long-Term and Residual Effects of Nitrogen Fertilization on Corn Yields, Soil Carbon Sequestration, and Soil Nitrogen Dynamics

X. Hea, R. C. Izaurraldea, M. B. Vanottib, J. R. Williamsc and A. M. Thomsona,*

a Joint Global Change Research Institute, Pacific Northwest National Laboratory, University of Maryland, 8400 Baltimore Avenue, Suite 201, College Park, MD 20740
b USDA-ARS, South Atlantic Area, Coastal Plains Soil, Water, and Plant Research Center, 2611 West Lucas Street, Florence, SC 29501
c Texas A&M University, Blacklands Research Center, 808 East Blacklands Road, Temple, TX 76502


Figure 1
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  		Fig. 1. Annual means of daily temperatures and total precipitation at Arlington, WI.

 

Figure 2
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  		Fig. 2. Observed and simulated corn yields as affected by long-term N applications.

 

Figure 3
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  		Fig. 3. Annual number of water, N, and temperature stress days by treatment.

 

Figure 4
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  		Fig. 4. Simulated and measured soil organic carbon (SOC), soil organic nitrogen (SON), and C to N ratio in top 20-cm soil. Lines represent simulated values while symbols represent measured values.

 

Figure 5
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  		Fig. 5. Temporal dynamics of soil bulk density under different N treatments.

 

Figure 6
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  		Fig. 6. Observed and simulated long-term effects of N fertilization on soil organic carbon change ({Delta}SOC) under continuous corn at Arlington, WI. Upper two figures are observed and simulated {Delta}SOC for 1958–1984. Lower two are for observed and simulated {Delta}SOC for 1958–1990.

 




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