Corn requires large quantities of nitrogen per bushel of grain produced. Nitrogen recommendations will vary according to potential yield goal, soil type, organic matter content in the soil and the previous crop. Corn removes approximately 1.2 pounds of nitrogen, .35 pounds of phosphorus and .25 pounds of potassium per bushel of grain. It is important to supply the corn crop with the appropriate amount of nitrogen, phosphorus and potassium to obtain potential yield goals.
To maximize corn yields, make sure a soil test indicates that your soil has an optimum level of phosphorus and potassium. Then apply the recommended amounts of nitrogen, phosphorus and potassium based on grain removal. The calculator below will help you determine the recommended amount of nitrogen, phosphorus and potassium needed based on grain removal only.