TL;DR: New research shows that biochar made from phosphate-poor feedstock encourages much more symbiosis with mycorrhizal fungi, compared to biochar made from phosphate-rich feedstock, which encourages very little mycorrhizal symbiosis.
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I recall reading that someone discovered that a primary reason the amazon forest is so fertile now is that it has a huge stock of biochar left by the mayan civilization.
Either they knew what they were doing, or it is a happy effect of all the cooking fires they made, from the char they left in the area.
