SSSAJ Journal of Natural Resources and Life Sciences Education
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

Published in Soil Sci Soc Am J 55:923-927 (1991)
© 1991 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
This Article
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Similar articles in this journal
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Ross, P. J.
Right arrow Articles by Bristow, K. L.
Right arrow Search for Related Content
PubMed
Right arrow Articles by Ross, P. J.
Right arrow Articles by Bristow, K. L.
Agricola
Right arrow Articles by Ross, P. J.
Right arrow Articles by Bristow, K. L.

Equation for Extending Water-Retention Curves to Dryness

P. J. Ross*, J. Williams and K. L. Bristow

Division of Soils, CSIRO, Davies Laboratory, Townsville, Qld 4814

*Corresponding author.

ABSTRACT

Simple water-retention functions in current use do not predict zero water content at oven dryness. Using the Campbell equation {theta} = a {psi}-c = {theta}s ({psi}-c – {psi}-c0) relating volumetric water content, {theta}, to matric suction, {psi}, as an example, we examined a modification to ensure that the curve terminates in a suction {psi}0 = 1000 MPa, approximating oven dryness. The new equation is {theta} = a({psi}-c – {psi}-c0) = {theta}s ({psi}-c – {psi}-c0)/({psi}-cc – {psi}-c0. It was compared with the unmodified equation by fitting to water-retention data from Australia, the UK, and the USA. Results showed not only that the new equation fit the data slightly better than the original equation, with a mean standard deviation of 0.014 m3 m–3 about the regression, but also that its parameters could be calculated from those of the unmodified equation if original water-content data were unavailable for fitting. Although lack of data hampered assessment of its predictions of water content in dry soils, its use appears preferable to extrapolating the unmodified equation.

Received for publication October 30, 1990.


This article has been cited by other articles:


Home page
 Soil Sci.Home page
S. Lu, T. Ren, Y. Gong, and R. Horton
Evaluation of Three Models that Describe Soil Water Retention Curves from Saturation to Oven Dryness
Soil Sci. Soc. Am. J., September 30, 2008; 72(6): 1542 - 1546.
[Abstract] [Full Text] [PDF]

Home page
 Vadose Zone JHome page
M. Khlosi, W. M. Cornelis, A. Douaik, M. Th. van Genuchten, and D. Gabriels
Performance Evaluation of Models That Describe the Soil Water Retention Curve between Saturation and Oven Dryness
Vadose Zone J., February 1, 2008; 7(1): 87 - 96.
[Abstract] [Full Text] [PDF]

Home page
 Vadose Zone JHome page
K. A. Winfield, J. R. Nimmo, J. A. Izbicki, and P. M. Martin
Resolving Structural Influences on Water-Retention Properties of Alluvial Deposits
Vadose Zone J., May 26, 2006; 5(2): 706 - 719.
[Abstract] [Full Text] [PDF]

Home page
 Soil Sci.Home page
R. Haverkamp, F. J. Leij, C. Fuentes, A. Sciortino, and P. J. Ross
Soil Water Retention: I. Introduction of a Shape Index
Soil Sci. Soc. Am. J., October 27, 2005; 69(6): 1881 - 1890.
[Abstract] [Full Text] [PDF]

Home page
 Soil Sci.Home page
W. M. Cornelis, M. Khlosi, R. Hartmann, M. Van Meirvenne, and B. De Vos
Comparison of Unimodal Analytical Expressions for the Soil-Water Retention Curve
Soil Sci. Soc. Am. J., October 27, 2005; 69(6): 1902 - 1911.
[Abstract] [Full Text] [PDF]

Home page
 Agron. J.Home page
T. P. Leao, A. P. da Silva, E. Perfect, and C. A. Tormena
An Algorithm for Calculating the Least Limiting Water Range of Soils
Agron. J., July 13, 2005; 97(4): 1210 - 1215.
[Abstract] [Full Text] [PDF]

Home page
 Agron. J.Home page
M. Diaz-Zorita, J. H. Grove, L. Murdock, J. Herbeck, and E. Perfect
Soil Structural Disturbance Effects on Crop Yields and Soil Properties in a No-Till Production System
Agron. J., November 1, 2004; 96(6): 1651 - 1659.
[Abstract] [Full Text] [PDF]

Home page
 Soil Sci.Home page
W. M. Cornelis, D. Gabriels, and R. Hartmann
A Conceptual Model to Predict the Deflation Threshold Shear Velocity as Affected by Near-Surface Soil Water: I. Theory
Soil Sci. Soc. Am. J., July 1, 2004; 68(4): 1154 - 1161.
[Abstract] [Full Text] [PDF]

Home page
 Soil Sci.Home page
E. Perfect, A. B. Kenst, M. Diaz-Zorita, and J. H. Grove
Fractal Analysis of Soil Water Desorption Data Collected on Disturbed Samples with Water Activity Meters
Soil Sci. Soc. Am. J., July 1, 2004; 68(4): 1177 - 1184.
[Abstract] [Full Text] [PDF]

Home page
 Vadose Zone JHome page
L. Prunty and F. X. M. Casey
Soil Water Retention Curve Description Using a Flexible Smooth Function
Vadose Zone J., August 1, 2002; 1(1): 179 - 185.
[Abstract] [Full Text] [PDF]

Home page
 Soil Sci.Home page
A. H. Weerts, D. Kandhai, W. Bouten, and P. M. A. Sloot
Tortuosity of an Unsaturated Sandy Soil Estimated using Gas Diffusion and Bulk Soil Electrical Conductivity: Comparing Analogy-based Models and Lattice-Boltzmann Simulations
Soil Sci. Soc. Am. J., November 1, 2001; 65(6): 1577 - 1584.
[Abstract] [Full Text] [PDF]

Home page
 Soil Sci.Home page
A. H. Weerts, J. I. Freijer, and W. Bouten
Modeling the Gas Diffusion Coefficient in Analogy to Electrical Conductivity Using a Capillary Model
Soil Sci. Soc. Am. J., March 1, 2000; 64(2): 527 - 532.
[Abstract] [Full Text]


HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
The SCI Journals Agronomy Journal Crop Science
Journal of Natural Resources
and Life Sciences Education		 Vadose Zone Journal
Journal of Plant Registrations Journal of
Environmental Quality		 The Plant Genome
Copyright © 1991 by the Soil Science Society of America.