These are word's examples related to topsoil. Click on any word to go to its word's detail page. Or, go to the definition of topsoil.
Pure declines in nutrient stocks, and losses of topsoil and soil-physical structures are therefore parallels to the distinction between renewable and exhaustible resources.
Seeds were then germinated in a shadecloth 'nursery' (4% full daylight), in trays 5 cm deep filled with forest topsoil.
Tubs were filled with sandy secondary forest topsoil over 5 cm of coarse gravel.
The importance of nutrient input from litterfall to nutrient availability in the topsoil was particularly evident in the case of calcium and phosphorus.
High evapotranspiration rates in these climatic zones bring salts in the soil solution to the topsoil where the salts accumulate after water is evaporated.
When topsoil depth declines to 25 cm, productivity falls by about 75 per cent.
In fields with deep topsoils, the transitional period occurs between years 25 and 30.
As the topsoil was removed, leaching increased by 40 per cent, on average, over the 30-year time horizon.
For these species, seed input by humans (sowing) should not be necessary after topsoil has been replaced.
One soil sample was collected from the topsoil and one from a depth of 2 m in each pit.
The environmental objectives of conservation crop research revolve mainly around lowering the intensity of synthetic inputs and reducing activities that instigate topsoil loss.
The soil used was a 3:1 (v/v) mixture of limestone-derived topsoil and river sand.
However, almost one third of the geophagical soil samples showed lower concentrations in sodium, calcium and magnesium compared with the mean of forest topsoil.
Figure 3 shows that for topsoil depth greater than 50 cm, inherent productivity is in the range of 4,000 kg of dry matter per ha.
The fertilizers were incorporated into the topsoil in a band 50 cm wide on both sides of the hedge.
