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

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Rhoades, J. D. Search for Related Content PubMed Articles by Rhoades, J. D. Agricola Articles by Rhoades, J. D.

Mineral-Weathering Correction for Estimating the Sodium Hazard of Irrigation Waters¹

ABSTRACT

An equation previously proposed by Bower (2, 4) for evaluating the Na hazard of irrigation waters has been modified to include the effect of soil-mineral weathering on the changes that occur in the SAR values of waters applied to soils. The modification involves the incorporation of a coefficient which reduces the predicted soil drainage-water SAR values by various amounts, depending upon the mineral properties of the soil and the leaching regime used. The value of the coefficient required in the equation can be determined by simple laboratory procedures. The modified equation was tested on a calcareous soil by comparing the SAR values predicted from the equation with values actually obtained in a controlled lysimeter experiment. The applicability of the equation is supported by the excellent correspondence obtained between the calculated and observed SAR values.

¹ Contribution from the US Salinity Laboratory, Soil & Water Conservation Research Division, ARS, USDA, Riverside, Calif. This research was presented, in part, at the Western Soil Science Society meetings in Los Angeles, Calif., June 21, 1967.

² Soil Chemist, US Salinity Laboratory, Riverside, Calif.

Received for publication December 5, 1967. Accepted for publication April 23, 1968.