SSSAJ Journal of Natural Resources and Life Sciences Education
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Figure 4


Fig. 4. Economic optimum N rate for the average fertilizer cost/corn price ratio (EONRavg) vs. the Illinois soil N test concentration (ISNTc) for 2003 and 2004 well-drained sites. Regression models are shown for 2003, 2004, and all well-drained sites in all years.





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