NUTRIENT RECOMMENDATIONS FOR POTATOES
 
     
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+
            
cwt/a
lb/acre-2'
  
--------lb P2O5/acre--------
  
--------lb K2O/acre--------
200
80
  
90
63
35
10
0
  
147
102
56
10
0
250
100
  
112
78
44
10
0
  
184
127
70
13
0
300
120
  
135
94
53
12
0
  
221
152
84
16
0
350
140
  
157
110
62
14
0
  
258
178
98
18
0
400
160
  
180
125
71
16
0
  
294
203
112
21
0
450
180
  
202
141
80
18
0
  
331
229
112
23
0
Nitrogen recommendation = 0.4YG - STN - LC
Bray-1 P recommendation = (0.5 - 0.026 STP)YG
Olsen P recommendation = (0.5 - 0.034 STP)YG
Potassium recommendation = (0.85 - 0.0057 STK)YG

Potato Statements:

  1. If P2O5 and/or K2O are recommended:  The best placement of fertilizer for potatoes on very low testing soils is 2 inches below and 2 inches on each side of the seed piece.  Avoid placement of fertilizer in contact with the seed piece.
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