AN ESTIMATION OF GAPON SELECTIVITY COEFFICIENT FOR NA/CA+MG EXCHANGE IN SOME SALT-AFFECTED SOILS OF TABRIZ PLAIN

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FARAHMAND A.; OUSTAN SH.; JAFARZADEH A.A.; ALIASGHARZAD N.

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Journal: Iranian Journal of Soil and Water Research Year:2009 | Volume:40 | Issue:1 Page(s): 17-26

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Title

AN ESTIMATION OF GAPON SELECTIVITY COEFFICIENT FOR NA/CA+MG EXCHANGE IN SOME SALT-AFFECTED SOILS OF TABRIZ PLAIN

Author(s)

FARAHMAND A. | OUSTAN SH. | JAFARZADEH A.A. | ALIASGHARZAD N. | Issue Writer Certificate

Keywords

EXCHANGE EQUATIONQ3

SODICITYQ2

ANION EXCLUSIONQ3

ESPQ3

SARQ1

ESRQ3

Abstract

Studies by the US Salinity Laboratory, using Gapon rule, led to the value of 0.01475 (mmol L-1)-0.5 for the modified Gapon selectivity coefficient (K'G). Nevertheless, the results of subsequent research reveled that K'G isn't constant and could take on a wide range of values depending on soil properties. The aim of this study was to determine the relationship between Exchangeable Sodium Ratio (ESR) and Sodium Adsorption Ratio (SAR) in some salt-affected soils of Tabriz plain. To follow this, thirty composite soil samples were taken from the area. For the soils in the study area with SAR<100 (mmol L-1)0.5 the ESR-SAR relationship was of the form: ESR=0.011+0.0072 SAR (r2=0.86) which didn't follow the traditional USSL equation. After correction of the data for ANION EXCLUSION, this relationship was modified: ESR=-0.041+0.0120 SAR (r2=0.90). As a result, taking into account the ANION EXCLUSION increased the K'G value considerably. However, K'G value was still lower than 0.01475 (mmol L-1)-0.5.This may be attributed to the high salinity level of the investigated soils which can lead to an increase in the affinity of clay minerals for calcium and magnesium through other mechanisms (compression of DDL and/or the formation of quasi crystals) in addition to the ANION EXCLUSION mechanism. In a multiple regression procedure, ECe was negatively while ESP positively associated with K'G (r2=0.73). After correction of the data for ANION EXCLUSION the association was merely with ESP (r2=0.49).

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APA: Copy

FARAHMAND, A., OUSTAN, SH., JAFARZADEH, A.A., & ALIASGHARZAD, N.. (2009). AN ESTIMATION OF GAPON SELECTIVITY COEFFICIENT FOR NA/CA+MG EXCHANGE IN SOME SALT-AFFECTED SOILS OF TABRIZ PLAIN. IRANIAN JOURNAL OF SOIL AND WATER RESEARCH, 40(1), 17-26. SID. https://sid.ir/paper/225982/en

Vancouver: Copy

FARAHMAND A., OUSTAN SH., JAFARZADEH A.A., ALIASGHARZAD N.. AN ESTIMATION OF GAPON SELECTIVITY COEFFICIENT FOR NA/CA+MG EXCHANGE IN SOME SALT-AFFECTED SOILS OF TABRIZ PLAIN. IRANIAN JOURNAL OF SOIL AND WATER RESEARCH[Internet]. 2009;40(1):17-26. Available from: https://sid.ir/paper/225982/en

IEEE: Copy

A. FARAHMAND, SH. OUSTAN, A.A. JAFARZADEH, and N. ALIASGHARZAD, “AN ESTIMATION OF GAPON SELECTIVITY COEFFICIENT FOR NA/CA+MG EXCHANGE IN SOME SALT-AFFECTED SOILS OF TABRIZ PLAIN,” IRANIAN JOURNAL OF SOIL AND WATER RESEARCH, vol. 40, no. 1, pp. 17–26, 2009, [Online]. Available: https://sid.ir/paper/225982/en

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