Salinity and sodicity can cause hysteresis in soil hydraulic conductivity

Taiwo Adeyemo, Isaac Kramer, Guy J. Levy, Yair Mau*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

Soil salinization and sodification can cause severe damage to soil structure, with important implications for irrigated agriculture. Knowledge of the extent to which degradation in soil structure due to salinization and sodification is reversible, however, is still lacking. The objective of our study is to examine how the history of solute composition affects the degree of reversibility in saturated hydraulic conductivity (Ksat). We systematically investigate the effects of salinity (electrolyte concentration) and sodicity (sodium adsorption ratio) on Ksat, for three soils of varying clay content. The soil column experiments yielded hysteresis graphs, in which Ksat does not go back to its original value after initial decay. We developed indices to quantify the degree of Ksat degradation and reversibility, and found that contrary to our expectations, high susceptibility to degradation does not always correlate with low capability to rehabilitate. Measurements of soil swelling helped us discern when degradation was mainly caused by swelling or clay dispersion. Our findings underscore the need for understanding hysteresis caused by salinity and sodicity, aiming at better management of agricultural soils for sustainable long-term use.

Original languageAmerican English
Article number115765
JournalGeoderma
Volume413
DOIs
StatePublished - 1 May 2022

Bibliographical note

Publisher Copyright:
© 2022

Keywords

  • Hysteresis
  • Salinity
  • Saturated hydraulic conductivity
  • Sodicity
  • Soil degradation
  • Soil structure

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