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Hydrophobicity of Soil

  • Reference work entry
  • First Online:
Encyclopedia of Agrophysics

Synonyms

Localized dry spot; Soil water repellency

Definition

Hydrophobic – meaning “water fearing” in Greek.

Hydrophobic soils – repel water, generally resulting in water beaded on the surface.

Hydrophobicity – sometimes refers to a soil–water contact angle >0°. These soils absorb less water and more slowly than hydrophilic soils.

Introduction

Hydrophobicity impedes the rate and extent of wetting in many soils. It is caused primarily by organic compounds that either coat soil particles or accumulate as particulate organic matter not associated with soil minerals. Sandy textured soils are more prone to hydrophobicity because their smaller surface area is coated more extensively than soils containing appreciable amounts of clay and silt. The most important effect of hydrophobicity is changes to soil water dynamics. Hydrophobicity causes negative effects through reduced infiltration and water retention, leading to enhanced run-off across the soil surface, preferential flow pathways in...

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Correspondence to Paul D. Hallett .

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Hallett, P.D., Bachmann, J., Czachor, H., Urbanek, E., Zhang, B. (2011). Hydrophobicity of Soil. In: Gliński, J., Horabik, J., Lipiec, J. (eds) Encyclopedia of Agrophysics. Encyclopedia of Earth Sciences Series. Springer, Dordrecht. https://doi.org/10.1007/978-90-481-3585-1_195

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