One of the mysteries of the English language finally explained.
The introduction of salts or colloids into one soil horizon from another by percolating water.
- ‘The study also indicates that the illuviation of clay particles and their subsequent accumulation in the Bt horizons have occurred in sodic environment.’
- ‘Clay illuviation is the process that has been most exhaustively considered in micromorphological studies.’
Early 20th century: from il- ‘in’ + -luvial (on the pattern of alluvial) + -ation.
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