[blam]

Don't know if you've seen this.

Rainforest Researchers Hit Pay Dirt (Farming In South America 11K Years Ago)

"What researchers find most remarkable is that instead of destroying the soil, the indigenous inhabitants improved it - something ecologists don't know how to do today."

[Renfield]

I've seen it. By the way, although "modern ecologists" might not know how to improve the soil during cultivation, modern agronomists certainly do know. No-till farming improves the soil, often dramatically (especially when winter annual cover crops are used in conjunction with no-tilling).

I did my master's thesis research in agronomy (concerning nitrogen fertilizer management in no-till corn production) at the University of Kentucky, one of the pioneering institutions in no-till research. Not much room to discuss it here, but if we ever meet, I'll talk your ear off.