Abstract
Smectites separated from three soils of Ganges Floodplain, Bangladesh, were characterized. The smectites content in the fine clay fractions was in a range of 62 and 88%. Expansion to 1.8 nm by the Greene-Kelly test and the (060) spacing around 0.150 nm suggested that the smectites were mainly beidellite-type. Elemental composition calculated from total chemical analysis showed that the smectites had layer-charge of tetrahedral-origin and were rich in Fe. The structural formula for the smectites of Silty Ganges Alluvium, which is hardly subjected to decalcification, was estimated as (Si 6.90 Al 1.10 ) (Al 2.46 Fe 0.99 Mg 0.76 )P 20 (OH) 4 X 1.25 . The impact of iron-rich beidellite on the soil fertility potential was discussed.
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