noun
Refers to soil as a natural substance, especially in agricultural, geological, or environmental contexts. More formal than 土 (つち).
この地域の土壌は稲作に適している。
The soil in this region is suitable for rice cultivation.
土壌汚染が深刻な問題になっている。
Soil contamination has become a serious problem.
noun
breeding ground; fertile ground
Metaphorical use: an environment or conditions that foster the development of something, often negative (crime, corruption) but also positive (talent, culture).
貧困は犯罪の温床となる土壌だ。
Poverty is a breeding ground for crime.
自由な校風が創造性を育む土壌となった。
The liberal school culture became fertile ground for nurturing creativity.