Phosphorus and potassium fertilization tips
If you are planning to make a long-term commitment to more corn, note that, overall, corn can remove more P and less K than soybean. Your fertilization plans should be adjusted accordingly. As an example, a corn crop of 180 bushels an acre removes about 77 pounds of P2O5 and 50 pounds of K2O per acre, while a soybean crop of 50 bushels an acre removes about 42 pounds of P2O5 and 65 pounds of K2O per acre. Assuming constant yields, over two years a corn-corn rotation will remove 35 pounds of P2O5 per acre more than a corn-soybean rotation but 15 pounds of K2O per acre less. (This of course assumes nutrient removal only in grain. If stover is removed as well, additional nutrients will be removed. For details on nutrient removal in stover see "Removing Crop Residue Removes Nutrients from the Field.")
The single most important thing to know before deciding placement method and when and how much phosphorus and potassium to apply is the test levels of the soil. To find these out, there is no substitute for a regular (every four years) soil sampling program.--
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