For what purpose with progressive planting of trees on poor soils, the soil is infected with special types of mushrooms?

1) These mushrooms braid the roots of trees with their mushrooms – mycorrhiza occurs, due to which the tree receives water and salt from a huge surface of the soil.
2) The tree does not need to spend a lot of time, substance and energy to create a powerful root system.
3) When transplanting this tree to a new place, it is easier to take root.

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