bedrock
The layer of solid rock underlying a soil profile or other surface materials.
GardenWeb Glossary of Botanical Terms
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Bedrock-The solid rock that underlies loose material, such as soil, sand, clay, or gravel.
Bioactive-Having the ability to interact with a living tissue or system, such as a human being or other living organism.
In this region, bedrock is close to the surface, and soils are generally thin and highly acidic. The gardening season is short, except near the coast, with USDA hardiness zones ranging from 3 to 7.
A much tighter soil, known as a black cracking clay soil, has formed on hard bedrock. For gardeners, the sticky clays mean that working of the soil can be very difficult.
Calcitic lime is mined from natural, limestone bedrock deposits. The soil is bulldozed off the bedrock; holes are drilled in the limestone, then it is blasted out with dynamite charges.
Soils are formed from above (decaying organic matter) and from below (weathering bedrock). These two directions of creation create layers in the soil, known as soil horizons.
Many of the UK's most beautiful landscapes are based on thick chalk bedrock that covers much of southern, coastal England.
Soil horizons describe layers of soil material that run parallel to the surface beginning with top soil and moving downward to bedrock. You can see soil horizons in areas where several feet of dirt have been removed for construction.
It contains bigger pieces of rock than the above layers.
Horizon C: Bedrock
The bedrock is the layer of soil where rock is found, or rock that hasn't been broken up much. There is very little, if any, organic material.
Garden facts
Size: 35 x 25 metres
Orientation: southwest
Conditions: very steep slope, bedrock partially covered by 20 to 30 centimetres of added soil
Growing season: April to early October
Garden: focus waterfall and mini-terraces
Zone 4b ...
We have now moved up the hillside into our Hogan where flat areas are hard to find, and the deep bedrock of sandstone protrudes, giving no chance for cultivation.
Overwatering carries fertilizers and pesticides beyond root zones into ground water stored in alluvial or bedrock aquifers below the soil surface. Water in these aquifers can interact, sharing chemical contaminants.
Yet soil is about 45 percent minerals weathered from bedrock, 50 percent air and water, and only 5 percent organic matter.
Many soils get their character from the parent rock that was their main source. The weathering of rock involves not just breaking down the bedrock into smaller and smaller fragments, but chemical changes that occur in some of the minerals of the rock.
"I like to link a house with its surrounding landscape through its garden, and I am strongly influenced by the architecture I work with. But plants are my first love, so they take center stage. This garden’s bedrock is chalk with heavy clay ...
 See also: Plant, Water, Soil, Organic, High
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