Hydro-physical processes and soil properties correlated with origin of soil hydrophobicity

• Main Authors: Eduardo Saldanha Vogelmann, José Miguel Reichert, Juliana Prevedello, Gabriel Oladele Awe
• Format: Article
• Language: English
• Published: Universidade Federal de Santa Maria 2013-09-01
• Series: Ciência Rural
• Subjects: hidrofóbico; hidrofílico; material orgânico; repelência à água; umidade do solo
• Online Access: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782013000900008&lng=en&tlng=en

Hydrophobicity is the phenomenon where the soil has reduced wettability, usually associated with coating of soil particles by hydrophobic organic substances. This study aimed to provide a description of the hydrophobicity occurrence, highlight recent discoveries about the origin of phenomenon and discuss the main hydro-physical properties and chemical processes linked to the development of hydrophobic behavior in soils. Hydrophobicity is associated with other factors such as soil moisture, presence of some fungi species, particle size, soil pH and occurrence of burnings. The causative substances may be provided by local vegetation, through deposition or decomposition. The dependence and combination of different factors that influence hydrophobicity in soils lead to a spatial and temporal variability of the phenomenon, with negative consequences in the processes of infiltration and water percolation, affecting the three-dimensional distribution and dynamics of soil moisture. Thus, the occurrence of a hydrophobic character requires special attention, especially regarding soil use and management.