|Marsh, M - U.C. RIVERSIDE|
|Tseng, P - U.C. RIVERSIDE|
Submitted to: Agronomy Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: September 19, 1995
Publication Date: N/A
Technical Abstract: The Pachappa soil is one of the most studied soils in soil physics, and the hydraulic properties have been measured numerous times by numerous investigators over the past 50 years. This history gives us a unique opportunity to compare measurements over a long time sequence. The purpose of our study was to compare and contrast measurements of soil water retention and hydraulic conductivity measured on the Pachappa soil. A number of methods have been used over the years, ranging from disturbed laboratory samples, to repacked cores, to in situ instantaneous profile methods. Where ever possible data were used to estimate the parameters of the van Genuchten equations, giving us a basis for comparison. Results indicate that parameters based on in situ measurements of transient drainage are comparable, those based on small cores or disturbed soil samples were not.