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 ?
Under pasture, there has been an increase in the number of sites not meeting topsoil bulk density and organic carbon targets.
You can make new garden beds quickly with no digging or tilling by using bags of topsoil as shown here.
Because vegetative matter will decompose over time, ground covers such as sod should be removed separately and either disposed of, composted, or stockpiled separately from topsoil for use in noncritical areas.
Sparling G, Dragten R, Aislabie J, Fraser R (1998) Atrazine mineralisation in New Zealand topsoils and subsoils: influence of edaphic factors and numbers of atrazine-degrading microbes.
An often used method to evaluate the effects of topsoil loss on productivity is the artificial removal or 'scalping' of surface soil.
You see villages that used to be inhabited but no longer are because the topsoil has washed away.
However these values of C stock in the topsoils (0-30cm) under SFT were lower than the corresponding value (95 Mg/ha) reported by Anikwe (2010) for a soil of finer texture than the present ones, and also occurring in a slightly more humid location in south-eastern Nigeria.
There was no obvious topsoil accumulation on the footslope or toeslopes at the base of the field.
For both soils, the depths of topsoil removal reduced the epipedon thickness of ca.
Additional high-resolution analyses of particle populations in the size range 250-2 [micro]m of the ND, TL, MG, and RB topsoils were conducted using a Coulter Multisizer (McTainsh at al.
Instead of "dumping" the food waste, cutlery and garbage bags at the local landfills, the project will use Biocorp products to recycle everything through local compost facilities to produce new, clean topsoil for area uses.