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Research ArticleRESEARCH SECTION

Influence of exchangeable sodium and clay mineralogy on soil water retention and hydraulic conductivity

H.W. Klopp, F. Arriaga and W. Bleam
Journal of Soil and Water Conservation November 2020, 75 (6) 755-764; DOI: https://doi.org/10.2489/jswc.2020.00182
H.W. Klopp
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F. Arriaga
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W. Bleam
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Abstract

Soil hydraulic properties are important for water management in salt and sodium (Na) affected soils. The soil saturated hydraulic conductivity (Ksat) has been found to decrease when high soil solution Na adsorption ratio (SAR) is coupled with low solution electrical conductivity (EC). Soil clay type plays an important role in changes to soil Ksat when the soil solution composition has a high SAR and low EC. Little is known about how soil water retention changes from solution EC and SAR. The objective of this study was to determine the impact of a range of solution EC and SAR values on soil Ksat, and water retention for soils containing swelling and nonswelling clay minerals. The soil Ksat and water retention were measured on four smectitic soils, a kaolinitic soil, and an illitic soil. Smectite swelling caused large changes in soil hydraulic properties in smectitic soils at high exchangeable Na percentage (ESP) and low EC levels, whereas there was a reduced effect on soils with little smectite clay. Increasing soil solution ESP and decreasing EC level caused the Ksat to decrease and the water content at a given pressure head to increase on soils that contained smectite. A narrower range of EC and SAR of waters suitable for use on smectitic soils are required to prevent changes in soil water flow rates and soil water retention.

    Key words
  • irrigation water quality
  • soil salinity
  • soil saturated hydraulic conductivity
  • soil sodicity
  • soil water management
  • soil water retention curve
  • © 2020 by the Soil and Water Conservation Society
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Journal of Soil and Water Conservation: 75 (6)
Journal of Soil and Water Conservation
Vol. 75, Issue 6
November/December 2020
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Influence of exchangeable sodium and clay mineralogy on soil water retention and hydraulic conductivity
H.W. Klopp, F. Arriaga, W. Bleam
Journal of Soil and Water Conservation Nov 2020, 75 (6) 755-764; DOI: 10.2489/jswc.2020.00182

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Influence of exchangeable sodium and clay mineralogy on soil water retention and hydraulic conductivity
H.W. Klopp, F. Arriaga, W. Bleam
Journal of Soil and Water Conservation Nov 2020, 75 (6) 755-764; DOI: 10.2489/jswc.2020.00182
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Keywords

  • irrigation water quality
  • soil salinity
  • soil saturated hydraulic conductivity
  • soil sodicity
  • soil water management
  • soil water retention curve

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