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Soil and water Losses
Crusts are thin soil surface layers more compact and hard, when dry, than the material directly beneath. They hamper seedling emergence, reduce infiltration and favour runoff and erosion. Seal is generally the term given to a wet crust. Both crusts and seals are formed in the same way so no further distinction will be made in this paper. The term crust is preferred and is used from here on.
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