Consistency of soil and environmental conditions within each replication is vital for the problem with very large plots is the inability to control soil and environment so they are identical between plots. If large plots can be used, then valid tests can be run. If the soil is variable, large plots would be poor options for research.
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
