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Published online 6 July 2006
Published in J Environ Qual 35:1227-1236 (2006)
DOI: 10.2134/jeq2005.0413
© 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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Accuracy and Performance of Three Water Quality Models for Simulating Nitrate Nitrogen Losses under Corn

J. D. Jabroa,*, A. D. Jabrob and R. H. Foxc

a USDA-ARS, Northern Plains Agricultural Research Laboratory, 1500 North Central Avenue, Sidney, MT 59270
b Robert Morris University, Moon Township, PA 15108
c Pennsylvania State University, University Park, PA 16802


Figure 1
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  		Fig. 1. (A) Geographic location of the experimental site. (B) Layout of the experimental site shows location of lysimeters. Strips 1 and 3, tilled N fertilized corn from 1988 to 1997. Strip 2, tilled N fertilized corn from 1988 to 1990, alfalfa from 1991 to 1993, and post-alfalfa tilled corn in 1994. X indicates the plots that have zero-tension lysimeters installed (adapted from Zhu, 2002).

 

Figure 2
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  		Fig. 2. Schematic diagram of pan lysimeter and its structural support (adapted from Jemison, 1991).

 

Figure 3
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  		Fig. 3. Relationship between the overall measured and the models' simulated NO3–N masses leached below 1.2 m for all five years and 13 treatments of LEACHM.

 

Figure 4
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  		Fig. 4. Relationship between the overall measured and the models' simulated NO3–N masses leached below 1.2 m for all five years and 13 treatments of NCSWAP.

 

Figure 5
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  		Fig. 5. Relationship between the overall measured and the models' simulated NO3–N masses leached below 1.2 m for all five years and 13 treatments of SOILN.

 




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