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Illinois Fertilizer Conference Proceedings
January 27-29, 1992

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Table 4: Optimum fertilizer rate for soybean yield determined by regressionspacer

  P2O5 Rate #/Acre     Coeff. Sig.
Year
Y/T		 Yield ECON QD LN Model Prob. R. Square
63-66 2/4 117 103 .10 .10 .0001 .5611
67-72 3/6 103 95 .10 .10 .0001 .5617
73-82+ 3/7 71 55 .10 .10 .0001 .3478
73-82- 3/7 78 72 .25 .10 .0001 .3931
83-87+ 2/4 84 76 * .25 .0827 .1686
83-87- 2/4 68 64 .25 .10 .0320 .2251
  K2O Rate #/Acre     Coeff. Sig.
Year
Y/T		 Yield ECON QD LN Model Prob. R. Square
63-66 2/4 30 27 * * .4277 .0160
67-72 4/6 66 59 * * .0217 .0353
73-82 2/7 67 64 .25 .25 .0614 .1867
83-87 2/4 150 143 * * .0088 .2954

Y/T = No. Yrs. Combined/No. Yrs. in Group

* = Probability > .25

+ = @ 240 lb N/acre = @ 60 lb N#/acre

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