火か山ざん灰ばい土ど壌じょう

noun

volcanic ash soil

Technical term used in geology, agriculture, and soil science to refer to soil formed from volcanic ash deposits.

• この地ち域いきの火か山灰ざんばい土ど壌じょうは水みずはけが良よい。

  The volcanic ash soil in this area drains well.