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Profile Distribution of Nonexchangeable Mg in the <1µ Clay in Seven Loess‐Derived Soils
Author(s) -
Protz R.,
Riecken F. F.
Publication year - 1968
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1968.03615995003200060041x
Subject(s) - loess , kaolinite , montmorillonite , clay minerals , illite , clay soil , chemistry , soil water , soil science , mineralogy , geology , geomorphology , organic chemistry
The nonexchangeable Mg content of the <1µ clay in seven loess‐derived soils representing a wide range of soil development decreases with depth. A direct relationship exists between the nonexchangeable Mg content of the <1µ clay and exchangeable Mg/g of <2µ clay. An inverse relationship is present between nonexchangeable Mg in the <1µ clay and exchangeable H/g of <2µ clay. The montmorillonite/kaolinite ratio increases sharply with depth to 50 cm, below which the ratio remains constant. It is concluded that Mg has not been built into the clay fraction during soil profile development.