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
94
Percentage frequency
A frequency expressed as a percentage of the total number of members.
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97
Percentage distribution
A frequency distribution with the total frequency equated to 100 and the individual class frequencies in proportion to that figure......
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1768
Exchangeable
Describes ions capable of replacement in the exchange (absorbing complex).
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1783
Sodium-adsorption ratio (SAR)
A ratio for soil extracts and irrigation waters used to express the relative activity of sodium ions in exchange reactions with soil :.....
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1786
Exchangeable-sodium percentage (ESP)
The degree of saturation of the soil exchange complex with sodium. It may be calculated by the formula :
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1789
Exchangeable acidity or Potential acidity
H+ ions held in reserve
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1795
Moisture content, Water content or Moisture percentage
The percentage of water in soil usually expressed on a dry-weight basis. If otherwise expressed, it should be stated.
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1804
Saturation percentage
The moisture contents of saturated soil paste.
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1818
Permanent wilting percentage, Wilting percentage, Wilting coefficient, or Permanent wilting point
The moisture content of the soil, expressed as a percentage of the dry mass when the leaves of a plant growing in the soil first undergo a permanent reduction in their moisture content. The soil water content at which plants will permanently wilt......
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1819
One-third atmosphere percentage
The moisture retained in an air-dried sample of soil that has been wetted and then brought to equilibrium on a permeable membrane. It closely approximates the moisture equivalent and field capacity for many soils......
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1820
Fifteen atmosphere percentage
The moisture percentage in a soil sample that has been wetted and then brought to equilibrium in the pressure-membrane apparatus at a pressure of 15 bar. It is expressed in terms of moisture percentage on a dry-weight basis, and lies in the wilting range for many soils......
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1984
Critical percentage
The point (percentage of the limiting element in the plant) above which there is luxury consumption and below which there is poverty adjustment......
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2155
Sodium complex
Colloidal matter of typical alkali soils more or less saturated with sodium.
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4821
Wetted soil percentage
The ratio, expressed as a percentage, between the volume of wetted soil for a micro-irrigation system and the total volume of soil in the root zone of a given crop. The calculation can be done on the entire field, for the field area served by a single nozzle-line or in an orchard, for the area occupied by a single tree......
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5100
Exchangeable sodium percentage (ESP)
The degree of saturation of the soil exchange complex with sodium. It may be calculated by the formula:
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5275
Sodium adsorption ratio or SAR
An expression for the relative activity of the sodium ions in exchange reaction with soil, calculated as a ratio for soil extracts and irrigation water. .....
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7668
Sodium adsorption ratio (SAR)
The proportion of soluble sodium ions in relation to the soluble calcium and magnesium ions in the soil water extract.
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7819
Percentage frequency of a given flood
The percentage of observed floods that were equal to or larger than a given flood within the period of observation or the per cent of floods that will be equal to or larger than a given flood......
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9026
Cost plus percentage contract
A contract in which the contractor is paid profit on the basis of a fixed percentage of the actual cost of the work.
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