Refers to fertile, well-structured soil rich in organic matter, often used in agriculture and gardening.
The loam in this field is suitable for growing vegetables.
soil from fine volcanic ash
Specifically denotes soil formed from fine volcanic ash, often found in volcanic regions; a more specialized geological term.
Keisōdo is soil formed from weathered volcanic ash.
腐植土 specifically means 'humus soil' or 'leaf mold', emphasizing decomposed organic matter, whereas 軽鬆土 can refer to loam in general or volcanic ash soil.
The term 軽鬆土 is composed of 軽 (light), 鬆 (porous, spongy), and 土 (soil), describing a light, porous soil. The exact historical derivation is uncertain, but it is a technical term used in soil science and agriculture.