Why does salt build up in highly-irrigated areas?



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    Irrigation leads to salt build up in soils largely for two reasons. The first is that the steady movement of water through the soil frees any salt that is contained in deeper layers and helps it come to the surface. The second is reason is that irrigation sometimes does not have adequate drainage, meaning that salts dissolved into the water are not carried away with the water, but instead remain in the topsoil.

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