The phrase "a layer of topsoil" is correct and usable in written English.
It can be used when discussing soil composition, gardening, agriculture, or environmental science.
Example: "The farmer decided to enrich the field by adding a layer of topsoil to improve crop yield."
Alternatives: "a stratum of topsoil" or "a coating of topsoil."
You can add a layer of topsoil over the fill".
A layer of topsoil and various forms of vegetation are placed as a final cover.
The final cap for a completed landfill may also be covered with a layer of topsoil that can support vegetative growth.
In a cost-saving element, several hundred thousand cubic yards of earth dug up for the salt creek is to be used for the berm and as a layer of topsoil to cap lightly contaminated areas.
The floodplains of many gravel-bed streams have a general stratigraphy that consists of a layer of topsoil covering gravel-dominated subsoil.
The so-called capping of the landfill, which involves placing a moisture barrier over the garbage mounds and a layer of topsoil onto that, is but the first step toward what politicians and the Sanitation Department say is a long-term plan to bring at least parts of the 3,000-acre 3,000-acrento propertyse as parkland.
The cultivation of a "dust mulch", a layer of tilled topsoil that seals in moisture to prevent it evaporating from around the plant's roots, is one example.
Over dinner in Kigali with a handful of longtime political aides and deep-pocketed donors, he recited the price of soy ("It never exceeded $8, and now it's $16") and extolled its virtues as a miracle crop ("You can grow it with just a thin layer of topsoil").
A week later, no smell could be detected as the workers tamped down a final layer of topsoil.
At first we didn't know what it was". A week later, no smell could be detected as the workers tamped down a final layer of topsoil.
The soil consists of a shallow layer of topsoil perched on top of sloping shale beds.
