What if Terra Preta is rediscovered in the early 20th century?

It's gradually becoming more and more clear that the Amazon basin was more densely inhabited than previously imagined, and that such populations were much more settled and agrarian than the scattered survivors of the post-Columbian exchange.

To be fair though, believing jungle agriculture could not support such populations was perfectly reasonable given the typical soils in those places. They're low in nutrients (and thus easily exhausted), and the rains help wash out much of what does accumulate. Slash-and-burn operations have to keep moving to new areas precisely in order to sustain productivity with new fields. Given how hard it can be even with modern technology, crops, and animals, it didn't appear possible to feed a population efficiently enough with pre-modern tools and techniques to sustain a high population density.

And all that is still absolutely true. Over time however, archeologists have managed to show that you can change the available soil into something intensely fertile that both sustains its nutrients and regenerates itself once established. This soil the pre-Columbian inhabitants created was called Terra Preta, and was an oddity given how when Europeans first discovered it, disease had already wiped out the communities that produced it, and the jungle easily swallowed those fields back up in the intervening time.

Now lets say that the technique how to make Terra Preta was recorded by some Jesuits and later ends up in their archives forgotten. Now this POD is technically happening in pre-1900, but lets say that everything else goes as OTL until 1900. Someone interested in pre-Columbian culture discovers the secret of Terra Preta while browsing trough the old documents and publishes it. People become fascinated with recreating the literal "Paradise Lost". How do things develop from here.

This question is obviously inspired by this thread:
(https://www.alternatehistory.com/discussion/showthread.php?t=249474)

But I want to explore the consequences of a late, aka. post 1900 rediscovery without butterflies to that point.
 
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