MINERALOGY OF SOILS FROM DIFFERENT AGROECOLOGICAL REGIONS OF BANGLADESH : REGION 11-HIGH GANGES RIVER FLOODPLAIN

概要

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Bangladesh has been divided into 30 Agroecological Regions (AEZs) and the applied agricultural research has currently been conducted on this basis. In context of the lack of enough information on mineralogy on the AEZ basis, an attempt has been taken to study mineralogy of important soils from all AEZs of Bangladesh in order to provide basic information for applied research. As a part of this attempt, the mineralogy of soils from three representative soil series of AEZ 11, High Ganges River Floodplain, has been reported in this paper. The clay content of the surface soils ranged from 8.9 to 30.4% and the texture was mostly silt loam. The 2-20μm fraction was found to dominate over other fractions in all soils. This fraction was composed mainly of quartz, followed by mica, plagioclase and chlorite. Mica was the predominant mineral in the <2 μm clay fraction followed by smectite in seven soils and by chlorite in five soils. The soils were uniformly grouped into three types depending on the smectite content in the <2μm clay fraction. The impact of mineralogy on the inherent potentiality of soils regarding crop production has been discussed.
日本粘土学会の論文