topsoil

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topsoil

the surface layer of soil to plough depth.
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Subsoil sampling depth was consistent at each site but differed between sites depending on the thickness of topsoil layers.
When growing tomatoes in bags, allow one bag of topsoil per plant.
By the end of the day, Dandy's Topsoil in Sealand, Flintshire, had only 2,880 tonnes left.
This adjustment of grade should always be done on subsoils rather than by manipulating healthy topsoils.
ABSTRACT: Topsoil loss by soil erosion frequently results in crop productivity decline.
It topsoil erosion continues at post-World War II rates, feeding an exploding world population could prove extremely difficult, he says.
When this was done, the index explained ~61 and 89% of the variability in C stock in the topsoils and subsoils, respectively (Fig.
These findings, topsoil depth variation, and visual evidence of erosion after storms, suggest that erosion rates under intensive carrot production may be high.
In conclusion, 1) the productivity of the two Mollisols studied, as measured by plant yield and N-mineralization potentials, was substantially reduced by topsoil removal, and 2) additions of N or P fertilizers to eroded topsoils improved yields, but these could not reach those attained on non-eroded topsoils under the same fertilizer treatment.
Geological Survey (USGS) in Denver reports that a sporeforming bacterium, Bacillus cereus, has a particular liking for topsoils overlying deposits of gold, copper and other ores that may be buried several hundreds of feet deep.
Presumably, the only notable form of aeolian activity to have occurred in the last 640 years will have been dust deposition to topsoils, and its possible remobilisation.