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ProCrop |
Fertility Requirements for Corn Grain
| Yield Goal | Broadcast Suggestions | |||||||||
| Olson | ||||||||||
| Corn Grain (BU/A) | Soil N Plus Fertilizer N suggested (lb/A-2') | P Soil Test Level (lb/A) | K Soil Test Level (lb/A) | |||||||
| VL | L | M | H | VH | VL | L | M | H | ||
| 0-6 | 7-14 | 15-22 | 23-30 | 31+ | 0-80 | 81-160 | 161-240 | 241 | ||
| -------------P2O5, lb/A--------- | ------K2O, lb/A-------- | |||||||||
| 80 | 100 | 50 | 35 | 20 | 0 | 80 | 60 | 35 | 15 | |
| 100 | 125 | 65 | 45 | 25 | 10 | 100 | 75 | 45 | 15 | |
| 120 | 150 | 80 | 55 | 30 | 10 | 120 | 90 | 55 | 20 | |
| 140 | 175 | 90 | 65 | 35 | 15 | 140 | 105 | 65 | 20 | |
| 160 | 200 | 100 | 75 | 40 | 15 | 160 | 120 | 75 | 25 | |
| 180 | 225 | 115 | 85 | 45 | 20 | 180 | 135 | 25 | 0 | |
Nitrogen= 1.25 YG-NST
Phosphorus = (0.5790-0.193PST)YG
Potassium= (1.3750-0.0046KST)YG
NOTE: Broadcast recommendation can be reduced by 1/3 when applying phosphorus or potash in a band if the soil test levels are low or very low only. For soil test levels of M or H, no reduction of P is recommended.
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