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VZJ New Articles
Contents: May 2008, Volume 7, Issue 2   [Index by Author]       Other Issues: Previous No next  
Down ORIGINAL RESEARCH
Down TECHNICAL NOTES

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To see an article, click its [Full Text] link. To review many abstracts, check the boxes to the left of the titles you want, and click the 'Get All Checked Abstract(s)' button. To see one abstract at a time, click its [Abstract] link.

ORIGINAL RESEARCHBack

Augustus C. Resurreccion, Per Moldrup, Ken Kawamoto, Seiko Yoshikawa, Dennis E. Rolston, and Toshiko Komatsu

The classical gas diffusivity model by Buckingham was revisited to evaluate the variation of the pore continuity factor (X) with soil moisture conditions. The Buckingham model with X varying with matric potential and coupled with a two-region water retention model described well the gas diffusivity behavior in aggregated volcanic ash soils.
Published online 1 May 2008; doi: 10.2136/vzj2007.0058
Vadose Zone J May 1 2008: 397–405 [Abstract] [Full Text] [PDF]  

G. Gargiulo, S. A. Bradford, J. Simunek, P. Ustohal, H. Vereecken, and E. Klumpp

Knowledge of factors that influence bacteria transport behavior in the vadose zone is needed to protect drinking water supplies from contamination and to develop improved bioremediation strategies. We investigate the transport and deposition of representative hydrophobic and hydrophilic bacteria strains in sand at different water saturations. The amount of bacteria retained in the sand increased with decreasing water saturation, especially for the more hydrophobic strain that formed larger cell aggregates. Straining likely accounts for these observations because it increases in magnitude with increasing cell/aggregate size, and when a greater fraction of water flows through a larger number of small pore spaces with decreasing water saturation.
Published online 1 May 2008; doi: 10.2136/vzj2007.0068
Vadose Zone J May 1 2008: 406–419 [Abstract] [Full Text] [PDF]  

Lynn M. Dudley, Alon Ben-Gal, and Uri Shani

Concern has been expressed that prolonged irrigation with poor quality water in amounts less than required to refill the soil profile and leach salt left from previous irrigations in an effort to maximize water use and minimize groundwater contamination may eventually cause crop failure and destroy the soil resource. As salt accumulates, however, transpiration and yield will decrease and a fraction of the irrigation water subsequently becomes drainage limiting due to salt storage in the root zone. Through a series of computer simulations, it was found that there was a minimum value of the leaching fraction for every level of salinity and that plant-irrigation-drainage relationships are highly self-regulating.
Published online 1 May 2008; doi: 10.2136/vzj2007.0103
Vadose Zone J May 1 2008: 420–425 [Abstract] [Full Text] [PDF]  

J. A. Huisman, C. P. Lin, L. Weihermüller, and H. Vereecken

The accuracy of bulk electrical conductivity measurements with time domain reflectometry (TDR) was determined. Uncertainty introduced by probe calibration and reproducibility of TDR measurements was considered. An analytical expression to calculate the probe constant directly was also evaluated.
Published online 1 May 2008; doi: 10.2136/vzj2007.0139
Vadose Zone J May 1 2008: 426–433 [Abstract] [Full Text] [PDF]  

TECHNICAL NOTESBack

Jan Mertens, Valentijn Tuts, Jan Diels, Jan Vanderborght, Jan Feyen, and Roel Merckx

The design of an inexpensive, easy-to-make, and reliable drop counter is presented. A linear relation between the number of drops and the applied flux was found, resulting in an average drop size of 35 microliters. The unique design of the drop counter results in small temperature and ionic strength effects of the leachate water on the drop volume.
Published online 1 May 2008; doi: 10.2136/vzj2007.0096
Vadose Zone J May 1 2008: 434–438 [Abstract] [Full Text] [PDF]  

To see an article, click its [Full Text] link. To review many abstracts, check the boxes to the left of the titles you want, and click the 'Get All Checked Abstract(s)' button. To see one abstract at a time, click its [Abstract] link.

HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
The SCI Journals Agronomy Journal Crop Science
Journal of Plant Registrations Soil Science Society of America Journal
Journal of Natural Resources
and Life Sciences Education		 Journal of
Environmental Quality
Copyright © 2008 by the Soil Science Society of America.