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Soils become saline when salts accumulate in  the soil. In areas with heavy annual rainfall, the salts are washed away to the nearby river or sea, so the soil does not usually become saline in tropical areas.

However, soils may become saline in the following areas

1. Salt is used to clear ice and snow . When the ice melts the salty water accumulates in low lying areas

2. In farming areas, excess fertilizers or fertilizers with a high salt content may be used causing salinity. Fresh animal manure may also increase salt levels

3. If plants are irrigated with water containing dissolved salts and adequate drainage is not provided, the salts accumulate and soil becomes saline.

4. Along the sea coast, the spray from the waves during high tide, may increase the salt levels as the water evaporates. Similarly,  for brackish rivers and estuaries, flooding can result in deposits of salt in surrounding areas.



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