Our Insights | Agronomy
September 27, 2018

Fertilizer Removal Rates

A 2014-2016 research study funded by Illinois Nutrient Research and Education Council (NREC) collected and analyzed grain samples from Illinois. Based on the results, the University of Illinois lowered the removal rates of P2O5 and K2O. This is 10%-15% lower from the old U of I Agronomy Handbook values.

                                                      Nutrients Removed                                                              Fertilizer

Corn Yield P205 K2O DAP POTASH
300 111 72 241 120
275 102 66 221 110
250 93 60 201 100
225 83 54 181 90
200 74 48 161 80
175 65 42 141 70

 

                                                Nutrients Removed                                                          Fertilizer

Soybean Yield P205 K2O DAP POTASH
100 75 117 163 195
90 68 105 147 176
80 60 94 130 156
70 53 82 114 137
60 45 70 98 117
50 38 59 82 98

 

2 Crop Combined Fertilizer Maintenance

 

Corn   Soybeans   DAP POTASH
250 + 70 = 315 237