Talk:Water retention curve

From Wikipedia, the free encyclopedia

WikiProject Physics This article is within the scope of WikiProject Physics, which collaborates on articles related to physics.
??? This article has not yet received a rating on the assessment scale. [FAQ]
??? This article has not yet received an importance rating within physics.

Help with this template Please rate this article, and then leave comments to explain the ratings and/or to identify its strengths and weaknesses.
This article is part of WikiProject Soil, a project to improve Wikipedia's articles related to Soil. For guidelines see the project page and Wikipedia:Contributing FAQ.

[edit] Hysteresis

There is no unique relationship between Ψ and θ because moisture relations exhibit hysteresis. Diurnal hysteresis presents a huge challenge in measuring soil moisture content with intruments that measure potenntial.

Hysteresis arises from differences in (soil) wetting behaviour causing dry soil to re-wet. Hysteretic behaviour means that, for example, at a tension of 5kPa (0.05 bar) the water content of a field fine sand sample could be anything between 0.08 vwc to 0.25 vwc.(This is a worst scenario but has been recorded).[1]

See [2], [3], [4]

Paleorthid 21:25, 5 April 2006 (UTC)

[edit] Graph incorrect

The graph shown is incorrect. Matric potential should be negative kPa, not positive. Atrian 16:36, 27 December 2006 (UTC)