Golf Divots: why use sand or green mix stuff?

Did you ever asked yourself the question: why do they use sand or green stuff to repair golf divots?

If you put back the divot directly, the grass will die. But if you put some sand or sand mixed with seeds, the grass will grow back.

I found some articles that is in relation to this mystery...

"All depends on the grass type used on the fairway and tee box. If the grass is Bermuda, you would not seed, just sand to level the divot. Bermuda grass "creeps" (grows horizontally) and needs a soil/sand base to grow effectively."

"In most cases the divot mix is used to fill in the divot so there will not be a depression in the fairway or tee. The divot is usually not deep enough to kill the grass. Also, the grass has stolons or rhizomes, which when the plant is damaged will start the regeneration or spreading of the grass plant."

Source: Golf Business - Divot Repair Mix

Keep Golfing!