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Biochar experiment help

agalla
in Experiments

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I am tryingto set up a 6th grade science experiment on biochar. We will be growing tomatoes organically and tomatoes using biochar (ashes fro campfire or a fireplace mixed with soil. how much biochar to soil ratio? How would be the best way to set up this experiment? Help!! Any ideas?? Suggestions would be greatly appreciated...also to measure the results? should we measure to growth and production of the plants?

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