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Illinois Fertilizer Conference Proceedings
January 25-27, 1999

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Table 1. Yield goals, NO3-N contents, optimum yields and N rates, and N rate recommendations for 19 Illinois sites.
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Location
Soil
texture
Yield
goal
 April
NO3-N
0-24"
 June
NO3-N
0-12"
Optimum
Yield
Optimum
N rate
Recommended N rate
No. County
Iowa
Mich
Ill.
Mod Mi#
bu/A
ppm x 8
ppm
bu/A
lb/A
-------lb/A------------
Central  
1 Piatt
sicl
150
15.6
0.3
177
153
180
164
140
124
10 Logan
sil
163
29.8
6.5
162
225
200
165
156
125
11
Logan
sil
163
16.8
3.2
162
162
200
178
156
138
4 Warren
sil
167
38.8
4.2
155
96
200
161
160
121
5 Warren
sil
167
74.8
5.4
161
113
200
125
200
125
9 Iroquois
sicl
140
24.0
2.9
157
105
170
144
128
104
Northern  
12 Will
cl
117
49.6
5.7
173
91
140
90
100.
50
13 LaSalle
sicl
154
45.2
10.5
126
0*
150
140
145
100
14 Kendall
sicl
154
45.6
7.9
122
0
190
139
185
139
17 Kane
sil
152
60.6
14.7
138
0
110
121
142
81
19 Stephenson
sil
123
81.8
12.5
140
0
120
66
148
66
Southern  
15 Effingham
sil
115
36.0
13.2
157
59
80
102
98
62
16 Effingham
sil
98
42.8
11.9
124
92
90
75
118
75
Sandy soil  
2 Henderson
sl
150
22.0
8.3
99
0
180
158
140
118
3 Henderson
sl
150
23.4
2.0
134
134
180
157
180
157
7 Iroquois
fsl
150
26.8
7.0
132
186
180
153
180
153
Manured soils  
18 Stephenson
sil
155
91.0
13.3
171
111
80
45
136
35
6 Iroquois
sicl
131
300.0
55.4
150
0
0
0
0
0

* No significant differences- among treatment means at P=0.2. In these locations, optimum yield equals trial average yield.
# Modified Michigan. See text for details.

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