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Illinois Fertilizer Conference Proceedings
January 27-29, 1992

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Table 6: Percentage yield reduction from maximum when fertilizing for high P.I. yield based on regression curvesspacer

  Corn Fertility [106 Bu/A] Soybean Fertility [35 Bu/A]
Year 130 N 45 P2O5 30 K2O 130 N* 30 P2O5 45 K2O
6366 1.9 10.7 1.7 X.X 10.6 0.5
6672 1.3 7.2 3.9 0.1 13.4 0.4
7382+ 3.4 6.3 10.0 4.1 6.6 1.3
7382- - 1.7 - - 7.5 -
8387+ 1.7 6.3 2.4 0.6 6.6 11.2
8387- - 15.5 - - 6.5 -

* = N applied to previous year's corn

X.X = No useful curve generated

+ = @ 240 lb N/acre

- = @ 60 lb N/acre

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