You would have to mix in some humus, but not that much.
Typical jungle soil isn't that rich.
And the Sahara is not all sand. Some parts are very fertile, it just lacks water.
Someone (?) once proposed to pump the discharge from the Amazon river to the Sahara.
That would be as much as 200,000 tonnes of (muddy) fresh water per second.
So there people thinking about such technologies.
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