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Illinois Fertilizer Conference Proceedings
January 25-27, 1999

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Table 2. Dollar losses per acre that would have resulted from using four different N rate recommendation systems. Losses are calculated as the value of the yield loss due to nonoptimum N rates, plus the cost of the N in cases where N was over-applied.
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County
No.
Recommendation system
Iowa
Mich.
Mod. Mich.
Ill.
Central  
Piatt
1
6.91
1.13
8.32*
1.71*
Logan
10
1.46*
8.86*
24.25*
11.48*
Logan
11
5.54
2.90
3.10*
0.26*
Warren
4
35.86
32.04
4.67
31.06
Warren
5
16.54
0.34
0.34
16.54
Iroquois
9
7.58
4.46
0.00
2.54
Northern
 
Will
12
5.47
0.00
12.44*
0.66
LaSalle
13
18.00
16.80
12.00
17.40
Kendall
14
22.80
16.68
16.68
22.20
Kane
17
29.38
33.67
19.26
42.53
Stephenson
19
14.40
7.92
7.92
17.76
Southern
 
Effingham
15
5.23
18.26
0.12
17.78
Effingham
16
0.00
0.49*
0.50*
1.15
Sandy soil
 
Henderson
2
21.60
18.96
14.16
16.80
Henderson
3
14.32
3.62
3.62
14.32
Iroquois
7
0.06*
1.83*
1.83*
0.06*
Manured soils
 
Stephenson
18
0.00
0.49*
8.38*
1.18
Iroquois
6
0.00
0.00
0.00
0.00
Avg. loss:
 
11.40
9.36
7.64
11.97

* Recommended N rate less than optimum. In all other cases, the recommended N rate was higher than the optimum.

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