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Any idea whether this is damaging/depleting for the soil because it is so fast-growing? If so, to what extent can the soil be artificially rejuvenated through fertilizers or other tools?

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No, it's one of the only nitrogen fixing trees in the world. That's part of the reason it can grow as fast as it can.

I would also like information about this. How much does this tree deplete the soils, or do they help build them up?

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