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Re:"Amazonian dark earth" was the work of ancient humans by saalweachter on Wednesday January 17, 2024 @06:58AM (#39026561)
Note the step of adding it to your compost, not to your soil directly.

The charcoal acts like a sponge for water soluble nutrients in the soil; if you add it to the soil directly, it will suck them out of the soil first, temporarily depleting it. Long term it acts as a reservoir, but you want it to go into your garden full.

Re:"Amazonian dark earth" was the work of ancient humans by euroderf on Thursday January 18, 2024 @03:39AM (#39039435)
Okay, so "fully loaded" biochar sounds like a time-release nutrient source.