POTASH
(K2O) RECOMMENDATIONS FOR SOYBEANS AT VARIOUS YIELD POTENTIALS, CEC'S
& SOIL TEST LEVELS.
| Yield
bu/acre Potentials |
|
30 |
40 |
50 |
60 |
70 |
| Soil
Test K |
|
lb K2O per acre |
| ppm
(lb/acre) |
CEC
5 meq/100g |
| 25
(50)1 |
|
140 |
155 |
170 |
180 |
195 |
| 50
(100) |
|
110 |
125 |
135 |
150 |
165 |
| 75
(150) |
|
80 |
90 |
105 |
120 |
135 |
| 88-118
(176-235)2 |
60 |
75 |
90 |
105 |
120 |
| 130
(260) |
|
25 |
30 |
35 |
40 |
45 |
| 140
(280) |
|
0 |
0 |
0 |
0 |
0 |
|
|
|
|
|
|
|
|
CEC
10 meq/100g |
| 25
(50) |
|
175 |
190 |
205 |
215 |
230 |
| 50
(100) |
|
135 |
150 |
165 |
180 |
195 |
| 75
(150) |
|
100 |
115 |
130 |
140 |
155 |
| 100-130
(200-260)2 |
60 |
75 |
90 |
105 |
120 |
| 140
(280) |
|
30 |
40 |
45 |
50 |
60 |
| 150
(300) |
|
0 |
0 |
0 |
0 |
0 |
|
|
|
|
|
|
|
|
CEC
20 meq/100g |
| 50
(100) |
|
210 |
225 |
240 |
255 |
270 |
| 75
(150) |
|
160 |
175 |
190 |
205 |
220 |
| 100
(200) |
|
110 |
125 |
140 |
155 |
170 |
| 125-155
(250-310)2 |
60 |
75 |
90 |
105 |
120 |
| 165
(330) |
|
30 |
40 |
45 |
50 |
60 |
| 175
(350) |
|
0 |
0 |
0 |
0 |
0 |
|
|
|
|
|
|
|
|
CEC
30 meq/100g |
| 75
(150) |
|
250 |
265 |
280 |
290 |
300 |
| 100
(200) |
|
185 |
200 |
215 |
230 |
245 |
| 125
(250) |
|
125 |
140 |
155 |
165 |
180 |
| 150-180
(300-360)2 |
60 |
75 |
90 |
105 |
120 |
| 190
(380) |
|
30 |
40 |
45 |
50 |
60 |
| 200
(400) |
|
0 |
0 |
0 |
0 |
0 |
1 Values in parentheses
are lb/acre.
2 Maintenance recommendations are given for this soil test range.
Corn,
Soybean, Wheat, and Alfalfa Field GuideBulletin 827