Difference between revisions of "Organic material (WRB)"
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imported>Thierry Daunois (Created page with ''''Organic material''' is one of the diagnostic materials used, in the WRB system, to discriminate some soils from others. ==Description== Organic material : ==RSG in which org...') |
imported>Jacques Ducloy m (3 revisions imported) |
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==Description== | ==Description== | ||
| − | Organic material : | + | Organic material (from Greek ''organon'', tool) consists of a large amount of organic debris that accumulates at the surface under either wet or dry conditions and in which the mineral component does not significantly influence the soil properties. |
| + | |||
| + | ==Diagnostic criteria== | ||
| + | Organic material has one or both of the following : | ||
| + | * 20 percent or more organic carbon in the fine earth (by mass) | ||
| + | or : | ||
| + | * if saturated with water for 30 consecutive days or more in most years (unless drained), one or both of the following : | ||
| + | ** (12 + [clay percentage of the mineral fraction × 0.1]) percent or more organic carbon in the fine earth (by mass) | ||
| + | ** 18 percent or more organic carbon in the fine earth (by mass) | ||
==RSG in which organic material can be observed== | ==RSG in which organic material can be observed== | ||
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* 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) | ||
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| + | [[Category:Diagnostic materials (WRB)]] | ||
Latest revision as of 19:24, 28 June 2017
Organic material is one of the diagnostic materials used, in the WRB system, to discriminate some soils from others.
Contents
Description
Organic material (from Greek organon, tool) consists of a large amount of organic debris that accumulates at the surface under either wet or dry conditions and in which the mineral component does not significantly influence the soil properties.
Diagnostic criteria
Organic material has one or both of the following :
- 20 percent or more organic carbon in the fine earth (by mass)
or :
- if saturated with water for 30 consecutive days or more in most years (unless drained), one or both of the following :
- (12 + [clay percentage of the mineral fraction × 0.1]) percent or more organic carbon in the fine earth (by mass)
- 18 percent or more organic carbon in the fine earth (by mass)
RSG in which organic material can be observed
See also
- The FAO reference text, (2007 version)
