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I looked at it and you are right. I wasn't aware of this use. I guess that the good/bad boils down to the amount involved and the soil's parameters.

Ballsy to do that in the middle of an urban environment. That could be a new market for all the junkyards :D but you can get some unwanted effects with playing with the soil chemistry. The soil is very good at buffering its PH, so it needs an huge amount of added substances to be effective. The...