top-soil
Definition
- Noun:
- The upper layer of soil: "top-soil" refers to the outermost layer of earth, typically rich in organic matter and nutrients, where plants grow roots and most biological activity occurs. It is distinct from subsoil and bedrock below.
Usage Examples
- Noun:
- Farmers must protect the top-soil from erosion to ensure good crop yields. (The fertile upper layer of soil is essential for agriculture.)
- He dug a small hole and found the top-soil was dark and crumbly, perfect for planting vegetables. (The surface soil was rich and suitable for gardening.)
- The construction project removed all the top-soil, leaving only clay and gravel underneath. (The fertile surface layer was stripped away.)
Advanced Usage
"to lose top-soil": to have the upper layer of soil removed or degraded, often due to wind, water, or farming practices.
- Deforestation caused the region to lose valuable top-soil within a few years. (The fertile surface layer was washed or blown away.)
"top-soil depth": the thickness of the upper soil layer, which affects plant growth.
- The garden has a top-soil depth of only six inches, limiting what can be grown. (The surface layer is shallow.)
Variants and Related Words
Topsoil (n): an alternative spelling of "top-soil", meaning the same thing.
- The nursery sells bags of topsoil for home gardens. (A commercial product of the upper soil layer.)
Subsoil (n): the layer of soil beneath the topsoil, typically less fertile and containing more rock or clay.
- Below the top-soil, the subsoil was hard and compacted. (The deeper, less rich layer.)
Synonyms
- Surface soil: the uppermost part of the ground where plants grow.
- Loam: a specific type of fertile topsoil composed of sand, silt, and clay.
No Phrasal Verbs or Idioms
- "Top-soil" is primarily a technical noun and does not commonly appear in phrasal verbs or idioms.
Related Idioms (None)
- There are no common idioms using "top-soil" in English.