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Published online 11 January 2008
Published in Soil Sci Soc Am J 72:143-150 (2008)
DOI: 10.2136/sssaj2006.0208
© 2008 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Evaluation of the Illinois Soil Nitrogen Test for Predicting Corn Nitrogen Needs

Jeffrey T. Osterhaus, Larry G. Bundy* and Todd W. Andraski

Dep. of Soil Science, 1525 Observatory Dr., Univ. of Wisconsin, Madison, WI, 53706-1299


Figure 1
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  		Fig. 1. Relationship between Illinois Soil Nitrogen Test (ISNT) values (0–30 cm) and economic optimum N rates (EONR) for corn grain production in 80 N response experiments, 1984 to 2004. Vertical dashed line indicates the critical ISNT value reported by Khan et al. (2001).

 

Figure 2
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  		Fig. 2. Relationship between soil organic matter content and Illinois Soil Nitrogen Test (ISNT) values (0–30 cm) in 80 N response experiments, 1984 to 2004.

 

Figure 3
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  		Fig. 3. Relationship between Illinois Soil Nitrogen Test (ISNT) values (0–15 cm) and soil amino sugar-N values in 13 N response experiments, 1998 to 2004.

 

Figure 4
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  		Fig. 4. Relationship between Illinois Soil Nitrogen Test (ISNT) values (0–15 cm) and soil total N in 13 N response experiments, 1998 to 2004.

 

Figure 5
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  		Fig. 5. Relationship between Illinois Soil Nitrogen Test (ISNT) values (0–15 cm) and soil total C in 13 N response experiments, 1998 to 2004.

 




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