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Worm bins compost paper products and kitchen scraps. It's a common school project. Look Here. "Compared to ordinary soil, the worm castings contain five times more nitrogen, seven times more phosphorus and 11 times more potassium. They are rich in humic acids and improve the structure of the soil." Worm castings are part of soil, but so are sand/clay/gravel...
I believe Ms Walstad once said a little bit of regular kitchen compost would be ok. So maybe a little worm castings on the bottom layer would be ok. I'd sure like to hear about your results if you try it.
 
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