Leaves are the factories for photosynthesis, the process responsible for manufacturing sugars essential for plant growth and development and grain yield. All the leaves on a corn plant are important for determining grain yield. The upper leaf canopy (ear leaf and above) contribute primarily to the developing kernels on the ear after pollination. The lower leaf canopy (below the ear leaf) contributes primarily to the maintenance of the health of the lower stalk and roots during the grain filling period. Leaf loss (defoliation) that occurs near the time of pollination is more detrimental to yield potential than defoliation at any other time of the growing season.

For more information on this and other topics related to corn production, contact your state extension corn specialist or your local extension educator/agent.

Following is the link to the corn extension specialists: state extension corn specialist.