An oxide in which oxygen is present in the ratio of three atoms to two of another element.
- An E horizon, which usually underlies an O, H, or A horizon, is an ‘eluvial’ horizon, having lost compounds of iron and aluminium (sesquioxides) and silicate clay by leaching and translocation.
- Tea soils of south India contain large amount of free sequioxides, which results in strong P fixation.
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