Soil that is naturally rich in organic matter (typically containing at least 20% organic matter by weight in a layer more than one meter in thickness).
Origin
Late 19th century; earliest use found in The Botanical Gazette.
Definition of organic soil in US English:
organic soil
noun
Soil that is naturally rich in organic matter (typically containing at least 20% organic matter by weight in a layer more than one meter in thickness).
Origin
Late 19th century; earliest use found in The Botanical Gazette.