Growing Sweet corn, also corn,maize

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22 Oct 20 Mason Wong (Australia - sub-tropical climate)
I am growing corn for the 1st time & I seem to be winning, except, I have noticed the soil around the bottom of the stems is falling away as they are growing bigger, and the roots are showing a little. Is this normal? I keep covering them up but worry I may damage the corn. It is strong and healthy and they were dug in deep 45cm when planted. I just want to know if this is normal & are they air roots?
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23 Oct 20 (Australia - sub-tropical climate)
I hill the soil up around the plant when they are about 30-40cm high. This gives them soil for the roots to grow in. I also run a little fertiliser beside the plant before hilling up.
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22 Oct 20 Liz (Australia - arid climate)
Sweetcorn does look as though the roots are showing as it grows taller. They help to support the plant and are quite normal.
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