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Illinois Fertilizer Conference Proceedings
January 27-29, 1992

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Table 5: Optimum P and K soil test valuesspacer

Optimum Soil Test for Corn With no Added Fertility

  P1 Soil Test     Coeff. Sig.
Year
Y/T		 Yield ECON QD LN Model Prob. R. Square
83-87+ 3/5 74 - .10 .10 .0003 .2499
83-87- 2/5 53 - .25 .25 .5491 .0434
  K Test     Coeff. Sig.
Year
Y/T		 Yield ECON QD LN Model Prob. R. Square
83-87 3/4 115 - * * .3896 .0325

Optimum Soil Test for Soybean With no Added Fertility

  P1 Soil Test     Coeff. Sig.
Year
Y/T		 Yield ECON QD LN Model Prob. R. Square
83-87+ 2/4 77 - .10 .10 .0015 .2791
83-87- 2/4 95 - * * .0368 .1455
  K Test     Coeff. Sig.
Year
Y/T		 Yield ECON QD LN Model Prob. R. Square
83-87 2/4 221 - * * .0731 .1762

 

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