Salt I knew what you were doing from the get go.
Your wording is just fine.
This is what is going to happen the corn will take the nitrogen from the good soil on top not the bad clay.
Corn roots are shallow for the most part as far as I know.
If it is really heavy clay some plants cant even take up the nutrients due to the structure of it.
The nutrients are locked up in microscopic platelets in the soil.
Worth
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