Podsolisation is an extreme form of leaching which causes the eluviation of iron and aluminium sesquioxides. The process generally occurs in areas where precipitation is greater than evapotranspiration. The minerals are removed by a process known as leaching. When organic material is broken down nutrients are released, but at the same time organic...
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http://en.wikipedia.org/wiki/Podsolisation
The process by which soils become depleted of bases and increase in acidity, and leached surface layers are developed and the clay is removed.
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http://www.encyclo.co.uk/visitor-contributions.php
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