Hello? I am an ordinary farmer, I do not understand the deep theoretical knowledge to say a few words for your reference: please look at the picture

Corn grows to 8 leaves into the nodulation period.

The top picture of the corn grows to 11 leaves.

The above picture corn growth to 14 leaves

The above picture with a variety for example 16 leaves has entered the male pulling stage.

I hope my answer was helpful

Thanks for your question