An interesting program on National Public Radio said that the ancient Amazonian cultures used charcoal as a way to keep their poor jungle soils fertile. Discover Magazine also has a nice article about the same subject and Johannes Lehmann of
Cornell University has done some research on the subject and has great information online.
I'm giving it a try and would like other gardeners to participate and report their results.
Here's what I'm doing:
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I started off with a bag of Fertilome Potting Mix - note that it does not have any fertilizer. It's mainly just peatmoss and perlite.
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I created 3 different pots with identical plants.

1. Pot #1 has just the Potting Mix - nothing else. 6 quarts.
2. Pot #2 has the potting mix with 1 1/2 tsp 10-10-10 fertilizer.
3. Pot #3 has potting mix, fertilizer and 1/4 cup powdered charcoal.
Note - this is charcoal taken from the bag and pounded into a powder. I used hardwood charcoal as briquettes may have other additives.
I'm hoping to see results over the summer.
Let me know if you try the experiment and what your results are.
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