International Commission on Irrigation & Drainage Commission Interationale des Irrigation et du Drainage

Multilingual Technical Dictionary (MTD)
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Term No.Term Name/Term DescriptionAction
983
Belt of soil water
The part of the zone of aeration that consists of soil and other materials that lie near enough to the surface to discharge water into the atmosphere in perceptible quantities by the transpiration of plants or by evaporation from the soil......
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1033
Interstice, or Void (in a rock, or soil)
A space in a rock or soil, that is not occupied by solid matter.
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1364
Well graded soil
A continuous distribution of grain sizes from the coarsest to the finest components in a proportions that the successively smaller size grains just fill the spaces between the larger grains......
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1584
Soil Science
The science dealing with soil as a natural resource on the surface of the earth including soil formation, classification, mapping, the mineralogical, physical, chemical, biological and fertility properties of soil; also, in relation to their management and soil conservation for crop production......
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1585
Soil
The soil is a natural body of mineral and organic constituents, differentiated into horizons, of variable depth, which differs from the material below in morphology, physical make-up, chemical properties and composition, and biological characteristics. In agricultural soil science, the term soil is applied only to the thin upper part of the mantle .....
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1592
Soil morphology
The physical constitution of soil including the texture, structure, porosity, consistency and colour of the various soil horizons, their thickness and their arrangement in the soil profile......
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1597
Mature soil
A soil with well-developed soil horizons produced by natural processes of soil formation and essentially in equilibrium with its present environment......
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1598
Immature soil
A soil with indistinct or only slightly developed horizons because of the relatively short time it has been subjected to the various soil-forming processes. A soil which has not reached equilibrium with the environment......
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1600
Skeletal soil
A soil consisting mainly of coarse fragments of partly weathered rocks.
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1601
Endodynamorphic soil
Soil influenced mainly by parent material.
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1602
Ectodynamorphic soil
Soil shaped by influences other than the parent material.
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1603
Hydromorphic soil
Soil developed in the presence of excess water, all or part of the time.
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1604
Truncated soil
Soil having lost all or part of the upper horizons.
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1605
Residual soil
A soil formed from, or resting on consolidated rock of the same kind as that from which it was formed and in the same location......
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1606
Transported soil, or Secondary soil
Soil developed through the action of weathering and other agencies on materials, originating from previously existing soil and from rock debris, which have been eroded from their former locations and redeposited by the transporting agents......
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1607
Glacial tills, or Glacial soil
Soil formed from materials deposited during the melting of an ice sheet.
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1608
Alluvial soil
A soil, relatively recently deposited, developed by water from the parent material and characterized by little or no modification of the parent material by the soil-forming process......
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1609
Aeolian soil
Soil formed from wind-transported soil material.
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1611
Colluvial soil
Soil comprising heterogeneous deposits or rock fragments and soil material accumulated at the base of comparatively steep slopes through the influence of gravity, including creep and local wash......
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1613
Mineral soil
Soil composed chiefly of mineral matter.
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1614
Organic soil
Soil containing organic matter in sufficient quantities (equal to more than 30%) to dominate soil characteristics.
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1615
Soil profile
Vertical section of soil showing a sequence of horizons from the surface to the parent material.
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1619
Soil horizon
A layer of soil, approximately parallel to the soil surface, with characteristics produced by soil-forming processes.
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1620
Soil horizon symbols
The symbols used to designate soil horizons are marked with the capital letters H, O, A, B, C, E and R.
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1629
Subsoil
Part of a soil between the layer normally used in tillage and the depth to which most plant roots grow.
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