Agronomy Journal Journal of Natural Resources and Life Sciences Education
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Published online 17 June 2005
Published in Agron J 97:1046-1053 (2005)
DOI: 10.2134/agronj2003.0313
© 2005 American Society of Agronomy
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Fate of Nitrogen-15 in a Long-Term Nitrogen Rate Study

II. Nitrogen Uptake Efficiency

W. B. Stevensa,*, R. G. Hoeftb and R. L. Mulvaneyc

a USDA-ARS, Northern Plains Agric. Res. Lab., 1500 N. Central Ave., Sidney, MT 59270
b Dep. of Crop Sci., 1102 S. Goodwin Ave., Univ. of Illinois, Urbana, IL 61801
c Dep. of Nat. Resour. and Environ. Sci., 1102 S. Goodwin Ave., Univ. of Illinois, Urbana, IL 61801



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  		Fig. 1. The effect of long-term N application rate on grain yield in continuous corn production at Monmouth, IL. Arrows indicate the yield-based optimum N application rate (NY) at which maximum yield (YMAX) was obtained. The equation for each line is shown, preceded by the symbol corresponding to the specific data set. Symbols indicating statistical significance of the models follow each R2 value, with * and ** indicating P < 0.05 and 0.01, respectively. NY and YMAX values are listed in Table 2.

 


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  		Fig. 2. Relationships between N fertilizer application rate and uptake of total N, fertilizer-derived (15N-labeled) N, and soil-derived (nonlabeled) N during the growing season following application of labeled N (1994–1996, Monmouth, IL). The equation for each line is shown below its corresponding curve. Symbols indicating statistical significance of the models follow each R2 value, with *, **, and *** indicating P < 0.05, 0.01, and 0.001, respectively.

 




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