Jisho

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あかだまつち 赤玉土
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Noun
1. red soil aggregate; akadama; clay-like volcanic ash soil (used for bonsai, etc.)​
Wikipedia definition
2. Akadama​is a naturally occurring, granular clay like mineral that is used as soil for bonsai trees and other container-grown plants. It is surface mined, immediately sifted and bagged, and supplied in various grades: the deeper mined grade being somewhat harder and more useful in horticulture than the more shallow mined grades. Akadama may also act as one component of growing medium when combined with other elements such as sand, composted bark, peat, or crushed lava.
Read “Akadama” on English Wikipedia
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Read “Akadama” on DBpedia

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