In a sown field, wheat plants growing in the middle of the field have lower stems and higher

In a sown field, wheat plants growing in the middle of the field have lower stems and higher stems at the edge. how can you explain this?

If wheat plants are planted in a sown field, then in the middle of the field the stems of wheat plants have a shorter length, and at the edges the stems of wheat are much longer. This is due to the fact that in the middle of the sown field it is much warmer and lighter, but at the edges of the forest and the light does not go, but only comes from the field.