Difference between revisions of "Geric properties (WRB)"
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imported>Thierry Daunois (Created page with ''''Geric properties''' is one of the diagnostic properties used, in the WRB system, to discriminate some soils from others. ==Description== The term Geric properties ==Criteria...') |
imported>Jacques Ducloy m (4 revisions imported) |
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==Description== | ==Description== | ||
| − | The term Geric properties | + | The term "Geric properties" (from Greek ''geraios'', old) refers to mineral soil material that has a very low ECEC or even acts as an anion exchanger. |
==Criteria== | ==Criteria== | ||
| − | Geric properties : | + | Geric properties require : |
| − | + | * an ECEC (sum of exchangeable bases plus exchangeable acidity in 1 ''M'' KCl) of less than 1.5 cmol<sub>c</sub> kg<sup>-1</sup> clay | |
| + | or : | ||
| + | * a delta pH (pH<sub>KCl</sub> minus pH<sub>water</sub>) of +0.1 or more. | ||
==RSG in which geric properties can be observed== | ==RSG in which geric properties can be observed== | ||
| Line 17: | Line 19: | ||
* The [http://www.fao.org/ag/agl/agll/wrb/doc/wrb2007_corr.pdf FAO reference text], (2007 version) | * The [http://www.fao.org/ag/agl/agll/wrb/doc/wrb2007_corr.pdf FAO reference text], (2007 version) | ||
| + | |||
| + | [[Category:Diagnostic properties (WRB)]] | ||
Latest revision as of 18:19, 28 June 2017
Geric properties is one of the diagnostic properties used, in the WRB system, to discriminate some soils from others.
Description
The term "Geric properties" (from Greek geraios, old) refers to mineral soil material that has a very low ECEC or even acts as an anion exchanger.
Criteria
Geric properties require :
- an ECEC (sum of exchangeable bases plus exchangeable acidity in 1 M KCl) of less than 1.5 cmolc kg-1 clay
or :
- a delta pH (pHKCl minus pHwater) of +0.1 or more.
RSG in which geric properties can be observed
See also
- The FAO reference text, (2007 version)
