Word: podsol
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...cool, temperate region with enough rainfall to support dense forest, an entirely different type of soil develops: a podsol.† Tree roots do not bring enough lime to keep the soil from being acid, and their dead leaves form a layer of loose mold on the surface. Just below is a light-colored, often almost white layer of soil from which most of the soluble minerals have been leached by the heavy rainfall. Such a tree-formed soil is favorable for trees, but when man clears the forest and plants his grasslike wheat or corn, he gets poor crops...
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