podzolization

pedology

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In Heilongjiang: Soils
…the cold, wet soils are podzolized; i.e., the soluble salts and organic matter are leached out of the topsoil and deposited in an underlying subsoil. Such soils are of low fertility, and their cultivation causes erosion. The humus-rich, highly fertile black soils that cover one-fourth of the province are found…
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