“Crumbly black topsoil” in Japanese
Short answer
Crumbly black topsoil in Japanese is “黒ぼく” (kuroboku). Full meaning: crumbly black topsoil; porous hardened lava.
Other ways to say “Crumbly black topsoil” in Japanese
黒ぼく土
kurobokudo crumbly black topsoil (esp. from weathered volcanic ash), loam soil
クロボク
kuroboku crumbly black topsoil; porous hardened lava
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