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There are three problems here

1) There is no visible root flare so the tree might be too deep in the root ball; 2) the burlap and string are still on the top of the root ball; and
3) there should be no soil placed over the root ball.

You can clearly see in this photograph a light coating of soil covering the root ball. Only a light covering (about one or two inches) of mulch should be placed over the root ball-never soil. Soil cuts off oxygen and water from the roots and might encourage growth of roots over the main support roots. These roots could become stem girdling roots. See inside the root ball.

light layer of mulch should be applied to this tree