POTASH (K2O) RECOMMENDATIONS FOR CORN AT VARIOUS YIELD POTENTIALS, CEC'S & SOIL TEST LEVELS.

Yield Potentials bu/acre 100 120 140 160 180
Soil Test K lb K2O per acre3
ppm (lb/acre) CEC 5 meq/100g
25 (50)1 125 130 135 140 145
50 (100) 95 100 105 110 115
75 (150) 65 70 75 80 85
88-118 (176-235)2 45 50 60 65 70
130 (260) 20 20 20 25 25
140 (280) 0 0 0 0 0
CEC 10 meq/100g
25 (50) 160 165 170 175 180
50 (100) 120 125 135 140 145
75 (150) 85 90 95 100 105
100-130 (200-260)2 45 50 60 65 70
140 (280) 25 25 30 30 35
150 (300) 0 0 0 0 0
CEC 20 meq/100g
50 (100) 300 300 300 300 300
75 (150) 280 295 300 300 300
100 (200) 230 245 260 280 295
125 (250)2 180 195 210 230 245
145 (290) 110 120 125 135 145
165 (330) 35 40 40 45 50
175 (350) 0 0 0 0 0
CEC 30 meq/100g
75 (150) 300 300 300 300 300
100 (200) 300 300 300 300 300
125 (250) 245 260 275 290 300
150 (300)2 180 195 210 230 245
170 (340) 110 120 125 135 145
190 (380) 35 40 40 45 50
200 (400) 0 0 0 0 0

1 Values in parentheses are lb/acre.
2 Maintenance recommendations are given for this soil test level.
3 Potash recommendations should not exceed 300 lb per acre.

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