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Waterlogging
Soaking of agricultural land caused by a rising water-table [the surface of groundwater in the soil] or excessive irrigation. [Waterlogging] compacts soil, deprives roots of oxygen and contributes to salinization.
Source: Green 4 Green Glossary
Source: British Seed Houses (sorry, no weblink available)
Salinization
GreenFacts Summary on Desertification:
Español: AnegamientoFrançais: Engorgement (des sols)