Difference between revisions of "Reducing conditions (WRB)"
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Revision as of 12:15, 27 October 2009
Reducing conditions is one of the diagnostic properties used, in the WRB system, to discriminate some soils from others.
Contents
Description
The term "Reducing conditions" (from Latin reducere) refers to...
Criteria
Reducing conditions show one or more of the following :
- a negative logarithm of the hydrogen partial pressure (rH) of less than 20
or :
- the presence of free Fe2+, as shown on a freshly broken and smoothed surface of a field-wet soil by the appearance of a strong red colour after wetting it with a 0.2-percent α,α, dipyridyl solution in 10-percent acetic acid[1]
or :
- the presence of iron sulphide
or :
- the presence of methane
RSG in which reducing conditions can be observed
See also
- The FAO reference text, (2007 version)
Notes
- ↑ This test may not give the strong red colour in soil materials with a neutral or alkaline soil reaction
