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This article in SSSAJ

  1. Vol. 32 No. 5, p. 648-652
     
    Received: Dec 5, 1967
    Published: Sept, 1968


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doi:10.2136/sssaj1968.03615995003200050021x

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

  1. J. D. Rhoades2

Abstract

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.

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