Difference between revisions of "Abrupt textural change (WRB)"
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==Description== | ==Description== | ||
| − | The term "Abrupt textural change" refers to | + | The term "Abrupt textural change" (from Latin ''abruptus'') refers to a very sharp increase in clay content within a limited depth range. |
==Criteria== | ==Criteria== | ||
| − | + | An abrupt textural change requires 8 percent or more clay in the underlying layer and : | |
| − | + | * doubling of the clay content within 7.5 cm if the overlying layer has less than 20 percent clay | |
| + | or : | ||
| + | * 20 percent (absolute) increase in clay content within 7.5 cm if the overlying layer has 20 percent or more clay. | ||
==RSG in which abrupt textural change can be observed== | ==RSG in which abrupt textural change can be observed== | ||
Revision as of 13:39, 26 October 2009
Abrupt textural change is one of the diagnostic properties used, in the WRB system, to discriminate some soils from others.
Description
The term "Abrupt textural change" (from Latin abruptus) refers to a very sharp increase in clay content within a limited depth range.
Criteria
An abrupt textural change requires 8 percent or more clay in the underlying layer and :
- doubling of the clay content within 7.5 cm if the overlying layer has less than 20 percent clay
or :
- 20 percent (absolute) increase in clay content within 7.5 cm if the overlying layer has 20 percent or more clay.
RSG in which abrupt textural change can be observed
See also
- The FAO reference text, (2007 version)
