NUTRIENT RECOMMENDATIONS FOR CORN SILAGE
 
 
 
 
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+
 
 
 
 
 
 
ton/a
lb/acre-2'
 
---------lb P2O5/acre--------- 
 
--------------lb K2O/acre-------------
6
62
 
31
22
14
0
0
 
50
35
21
10
0
10
104
 
51
37
23
10
0
 
83
59
35
11
0
14
146
 
71
52
32
13
0
 
116
83
49
15
0
18 
187
 
92
67
41
16
0
 
149
106
63
20
0
22 
229
 
112
81
50
20
0
 
183
130
77
24
0
26 
270
 
132
96
60
23
0
 
216
153
91
29
0
Nitrogen recommendation = 10.4YG - STN - LC
Bray-1 P recommendation = ( 5.62 - 0.28 STP)YG
Olsen P recommendation = (5.62 - 0.35 STP)YG
Potassium recommendation = ( 9.50 - 0.06 STK)YG (60-lb minimum when K is recommended)

Corn Silage 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. When very reduced or no-till is used and deep nitrate is used and nitrogen is recommended: 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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