My Account: Log In | Join | Renew
Search
Author
Title
Vol.
Issue
Year
1st Page

Abstract

 

This article in SSSAJ

  1. Vol. 43 No. 3, p. 444-447
     
    Received: Oct 13, 1978
    Published: May, 1979


 View
 Download
 Alerts
 Permissions
 Share

doi:10.2136/sssaj1979.03615995004300030004x

Infiltration as Influenced by Irrigation Water Quality1

  1. J. D. Oster and
  2. Fred W. Schroer2

Abstract

Abstract

After 19 months of irrigation with waters of different quality, columns of Heimdal loam cropped to alfalfa had infiltration rates that were correlated better with irrigation water sodicity and salinity than with soil surface (0–76 mm) or column average (0–530 mm) exchangeable sodium and soil salinity. Two sets of irrigation water parameters were tested: (i) total cation concentration (Cc) in molc m-a (meq liter−1) and sodium adsorption ratio (SARc) of the irrigation water in equilibrium with solid phase CaCO3 at a PCO2 of 0.07% based on ion activities corrected for ion pairing; and, (ii) total cation concentration of the irrigation water as prepared and the adjusted sodium adsorption ratio based on the calculated pH of the water in equilibrium with CaCO3. On the basis of multiple linear regression analyses, the best correlation was obtained with the lime-equilibrated water parameters (R2 = 0.87). The corresponding relationship between infiltration rate (I) in mm hour−1 and the chemical parameters was I = 6.80 − 1.10 SARc + 0.79 Cc. Cation concentration greatly affected infiltration rates even at low SAR levels (2<SAR<5). Apparently, the mechanical action of the applied water greatly enhances the effects of exchangeable sodium and soil solution concentration on swelling and dispersion at the soil surface which, in turn, has a large effect on infiltration rates.

  Please view the pdf by using the Full Text (PDF) link under 'View' to the left.

Copyright © . Soil Science Society of America