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

Yield Potentials ton/acre 20 22 24 26 28
Soil Test K lb K2O per acre3
ppm (lb/acre) CEC 5 meq/100g
25 (50)1 260 275 290 300 300
50 (100) 225 245 260 275 290
75 (150) 195 210 230 245 260
88 (175)2 180 195 210 230 245
110 (220) 100 110 115 125 135
130 (260) 25 30 30 35 35
140 (280) 0 0 0 0 0
CEC 10 meq/100g
25 (50) 295 300 300 300 300
50 (100) 255 270 285 300 300
75 (150) 220 235 250 265 280
100 (200)2 180 195 210 230 245
120 (240) 110 120 125 135 145
140 (280) 35 40 40 45 50
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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Corn, Soybean, Wheat, and Alfalfa Field GuideBulletin 827