NUTRIENT RECOMMENDATIONS FOR CORN
 
 
 
  
 Soil Test Phosphorus, ppm
 
Soil Test Potassium, ppm
 Yield  
goal
Soil N plus fertilizer N required 
    VL
L
M
H
VH
   
 
  VL
L
M
H
VH
    Bray-1 0-5 6-10 11-15 16-20 21+   0-40 41-80 81-120 121-160 161+
    Olsen 0-3 4-7 8-11 12-15 16+          
 
bu/a
lb/acre-2'
 
--------lb P2O5/acre--------
 
--------lb K2O/acre--------
80
96
 
51
37
23
10
0
 
82
60
60
60
0
100
120
 
63
46
28
11
0
 
102
73
60
60
0
 120
144
  
76
55
34
13
0
 
122
87
60
60
0
140
168
 
89
64
39
15
0
 
143
102
61
 60
0
160
192
 
101
73
45
17
0
 
163
116
70
60
0
180
216
 
114
82
51
19
0
 
184
131
78
60
0
200
240
 
127
92
56
21
0
 
204
146
87
60
0
Nitrogen recommendation = 1.2YG - STN - LC
Bray-1 P recommendation = (0.700 - 0.035 STP)YG
Olsen P recommendation = (0.700 - 0.044 STP)YG
Potassium recommendation = (1.1660 - 0.0073 STK)YG (60-lb minimum when K is recommended)

Corn Statements:

  1. If fertilizer is recommended: Nitrogen plus K2O application in contact with the seed should be limited to 10 lb/a for 30 inch rows.  Nitrogen as urea, UAN and ammonium thiosulfate (12-0-0-26) should not be in contact with the seed.  Reduce seed placed fertilizer rate by 50% when soil conditions are dry or sandy.

  2. Because of your very reduced or no tillage system, 30 lb/a of additional nitrogen has been considered in the above N recommendation.

  3. When the previous "crop" was fallow or potatoes: The growth of corn after fallow or potatoes is sometimes not satisfactory.  To correct this, apply 20-30 lb/a of P2O5 as a starter.
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