Topsoil


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topsoil

[′täp‚sȯil]
(geology)
Soil presumed to be fertile and used to cover areas of special planting.
Surface soil, usually corresponding with the A horizon, as distinguished from subsoil.

Topsoil

 

the surface layer of soil that is regularly worked by tillage equipment. Topsoil 20–22 cm deep is considered normal. If it is less than 20 cm deep, it is considered shallow; if it is 22–35 cm or greater in depth it is considered deep. Between 80 and 90 percent of the roots of cultivated plants is concentrated in the topsoil. Therefore, the soil must be fertile, containing adequate amounts of the nutrients, moisture, and oxygen needed for both the roots and the soil microorganisms that break down organic remains into compounds assimilable by the plants. Organic and inorganic fertilizers are applied to the topsoil to enrich it with nutrients. The soil is loosened to increase its absorption of precipitation and its oxygen content.

topsoil

1. The surface of upper layer of soil, as distinct from the subsoil; usually contains organic matter.
2.See loam.
References in periodicals archive ?
Increases in topsoil and subsoil pH under cropping supports the general observation that many Tasmanian cropping soils are not suffering from acidification.
Avoid purchasing topsoil from a mountainous pile that might look fine and workable but is likely to be inert and infertile.
Remedying topsoil damage can be relatively easy once the depth of the compaction has been assessed.
However, the assessment and prediction of topsoil moisture at catchment scale is quite difficult to perform due to the large number of variables that control [[theta].
To get rid of that you're looking for a large topsoil supplier in South Wales.
If your soil is sandy, you are likely to find only a thin layer of dark, rich-appearing topsoil.
Available in a one square metre tote bag, Rolawn Beds and Borders Topsoil is a fertile, organic rich, light and friable topsoil, analysed to BS3882:2007, that contains a controlled release fertiliser and a water retentive polymer.
The only problem with topsoil is that the water that drains through it stains the surface underneath.
If you have hollows in your lawn, provided they aren't too deep you can top-dress them a few times between spring and autumn with a mixture of topsoil, compost and sand or ready-made turf dressing to rejuvenate the area.
According to the United Nations Convention to Combat Desertification, during the Dust Bowl years, "At least five inches of topsoil were lost from nearly 10 million acres.
Then, near the bottom of the hill, the steepness decreases and the land becomes relatively flat or forms a depression, where topsoil accumulates.
At the landfill, workers moved topsoil from an area that previously housed a barn; at the bridge, workers observed bat guano on bridge beams.