NUTRIENT RECOMMENDATIONS FOR SUNFLOWERS
 
 
 
 
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+
 
 
 
 
 
 
lb/a
lb/acre-2'
 
--------lb P2O5/acre--------
 
--------lb K2O/acre--------
1000
50
 
20
15
10
0
0
 
36
25
14
0
0
1400
70
 
29
21
13
0
0
 
50
35
20
0
0
1800
90
 
37
27
17
10
0
 
64
45
25
10
0
2200
110
 
45
33
20
10
0
 
78
55
31
10
0
2600
130
 
53
38
24
10
0
 
93
64
36
10
0
3000 150   61 42 27 10 0   107 74 42 10 0
Nitrogen recommendation = 0.05YG - STN - LC
Bray-1 P recommendation = (0.0225 - 0.0011 STP)YG
Olsen P recommendation = (0.0225 - 0.0014 STP)YG
Potassium recommendation = (0.041 - 0.00027 STK)YG

Sunflower Statements:

  1. If fertilizer is recommended:  When planted in 30-inch rows or wider, do not apply fertilizer with the seed.  When planted in 15-inch rows, limit seed placed N + K2O to 5 lb/a but do not use urea or UAN.

  2. When no-till or strip-till is used: 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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