NUTRIENT RECOMMENDATIONS FOR SORGHUM
 
 
 
 
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--------
60
66
 
36
26
17
10
0
 
46
32
18
0
0
80
88
 
48
35
22
10
0
 
61
42
24
0
0
100
110
 
60
44
28
11
0
 
76
53
30
10
0
120
132
 
73
53
33
14
0
 
91
63
35
10
0
140
154
 
85
62
39
16
0
 
106
74
41
10
0
160
176
 
97
70
44
18
0
 
121
84
47
10
0
Nitrogen recommendation = 1.1YG - STN - LC
Bray-1 P recommendation = (0.666 - 0.033 STP)YG
Olsen P recommendation = (0.666 - 0.041 STP)YG
Potassium recommendation = (0.875 - 0.0058 STK)YG

Grain Sorghum 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 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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