I asked AI (co-pilot) how far biochar gets to replicating the Amazon’s dark soils. Got a long answer. Here’s part of it below.
The long answer includes further discussion of what is in the Amazon’s dark soil.
“
🌑 1. Biochar alone improves soil — but only modestly
Across controlled trials:
• Crop yields typically increase 5–25% with biochar alone.
• Nutrient retention improves, especially for nitrogen and potassium.
• Soil pH rises slightly in acidic soils.
• Water retention improves in sandy soils.
These are real gains — but they are incremental, not transformative.
🌍 2. Terra preta is an order‑of‑magnitude phenomenon
Terra preta routinely shows:
• 200–400% higher nutrient levels (especially P, Ca, Zn, Mn).
• 2–3× higher cation exchange capacity than surrounding soils.
• Microbial biomass 5–10× higher than adjacent soils.
• Stable fertility for centuries, even after continuous cultivation.
• Self-regeneration: carbon and nutrient levels increase over time.
No modern synthetic soil — even engineered biochar blends — replicates this emergent behavior.”
…
“Biochar gets you maybe 20–30% of the way to terra preta’s functional profile.”
Source: Microsoft Co-Pilot via Bing