Most states across the Midwest and Northeast recommend about 30 to 40 lbs more N/acre for corn following corn comparing corn following soybean. However, the extra N does not make up for the expected yield penalty of corn following corn compared with corn following soybeans.
In the Mid-South, the N requirement for corn following corn is the same as corn following soybean. Again, the yield penalty of corn following corn is observed.
For more information on this or other topics related to corn production, contact your state extension corn specialist or your local extension educator/agent.
The following is the link to the corn extension specialists: state extension corn specialist