In sunny and wet places where the soil is soft
Probably.
It needs a fast good draining soil
Yes - You are suffocating the tree. Take the excess soil away from the tree. A tree should be planted no deeper than the root flare.
soft
By watering it daily planting it with good soil and have it in a good growing conditon.
Nutrients from the soil, sunlight & water
Tree is put in soil. Soil helps sustain tree's life.
Yes lemon tree wood is soft
Yes, it does because if a tree is planted it holds the soil and prevents soil erosion.
Depends on what you determine as "hard" or "soft". The general answer is that the inside of a tree is "soft". This general answer is derived from the comparison of the bark on the outside of a tree and the soft fleshy tissue on the inside of tree.
It can if you use it to, but the soil and stones around the roots will ruin the chain.