About a year ago, I was doing a little research into high-carbon soils. I have a terrible memory when it comes to details, but what I did retain is that some areas of tropical central America have a high carbon contentin the soil. In such soils, more nutrients are held due to the carbon. It was suggested that natural charcoals - that is, charcoal produced from real wood in a low-oxygen environment, NOT briquettes - could be ground fine and added to the soil to replicate this ability. I got a bag of this kind of charcoal, but was never able to efficiently powder it...
It was also mentioned somewhere that powdered natural charcoal could be saturated with fertilizer prior to being added to the soil, and that these nutrients would be available to plants over time.
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