HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Figures Only Full Text Free Full Text (PDF) Free Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in ISI Web of Science Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via ISI Web of Science (10) Citing Articles via Google Scholar Google Scholar Articles by Nassar, I.N. Articles by Horton, R. Search for Related Content PubMed Articles by Nassar, I.N. Articles by Horton, R. GeoRef GeoRef Citation Agricola Articles by Nassar, I.N. Articles by Horton, R.

DIVISION S-1-SOIL PHYSICS

Salinity and Compaction Effects on Soil Water Evaporation and Water and Solute Distributions

^a Alexandria Univ., Faculty of Agriculture-Damanhoar, Egypt
^b Dep. of Agronomy, Iowa State Univ., Ames, IA 50011 USA

rhorton{at}iastate.edu

Water evaporation and solute transport were studied in open soil columns. The study included two different soil materials — Clarinda clay (fine, montmorillonitic, mesic, sloping Typic Argiaquoll) and Fayette silty clay loam (fine-silty, mixed, mesic Typic Hapludalf) — and three conditions. Two conditions were noncompacted solute-free and salinized noncompacted soil columns of both Clarinda and Fayette soils, and one condition was compacted salinized soil columns of Clarinda soil only. The initial soil water contents were 0.271 and 0.181 m³ m^-3 for noncompacted Clarinda and Fayette soils, respectively. The initial soil water content of compacted Clarinda was 0.393 m³ m^-3. The initial KCl concentrations were 1.11 and 0.92 mol kg^-1 of soil solution for Clarinda and Fayette soils, respectively. Measured ratios of evaporation loss from the noncompacted salinized soil columns to the amount of water evaporated from noncompacted solute-free soil columns increased with time from 0.78 to 0.89 for Clarinda and 0.90 to 0.95 for Fayette soils. Evaporation from noncompacted Clarinda soil increased with time from 0.73 to 0.77 of the evaporation from compacted Clarinda soil. A numerical model of heat, water, and solute transfer was used to predict distributions of temperature, water content, and solute concentration for a given evaporation rate. Efficiency of the model for reproducing the water content and solute concentration ranged from 94.5 to 61.1%. The predicted and observed solute concentrations increased with time in the upper 0.02 m of noncompacted soil. Also, the upper soil portion, the 0.05-m layer, dried drastically. Both observations and predictions indicate complex interactions between heat, water, and chemicals near evaporating surfaces.

This article has been cited by other articles:

				H. Fujimaki, T. Shimano, M. Inoue, and K. Nakane Effect of a Salt Crust on Evaporation from a Bare Saline Soil Vadose Zone J., November 20, 2006; 5(4): 1246 - 1256. [Abstract] [Full Text] [PDF]

				J. W. Nyhan A Seven-Year Water Balance Study of an Evapotranspiration Landfill Cover Varying in Slope for Semiarid Regions Vadose Zone J., June 9, 2005; 4(3): 466 - 480. [Abstract] [Full Text] [PDF]

				H. Fujimaki, H. Fujimaki, and M. Inoue A Transient Evaporation Method for Determining Soil Hydraulic Properties at Low Pressure Vadose Zone J., August 1, 2003; 2(3): 400 - 408. [Abstract] [Full Text] [PDF]