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Published in Agron J 97:1222-1229 (2005)
DOI: 10.2134/agronj2004.0279
© 2005 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
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Corn Response to Nitrogen Fertilization in a Soil with High Residual Nitrogen

Ardell D. Halvorsona,*, Frank C. Schweissingb, Michael E. Bartolob and Curtis A. Reulea

a USDA-ARS, 2150 Centre Ave, Bldg. D, Suite 100, Fort Collins, CO 80526
b Colorado State Univ., Arkansas Valley Res. Cent., 27901 Rd. 21, Rocky Ford, CO 81067



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  		Fig. 1. Corn grain yields averaged over N sources as a function of plant available N [soil N (0–90 cm depth) plus fertilizer N applied] for four crop years at Rocky Ford, CO.

 


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  		Fig. 2. Gross economic returns minus N fertilizer costs averaged over N sources as a function of plant available N [soil N (0–90 cm depth) plus fertilizer N applied] for four crop years at Rocky Ford, CO.

 


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  		Fig. 3. Total cumulative corn grain yield in four crop years, averaged over N sources, as a function of total N fertilizer applied.

 




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