Saturday, 15 July 2006

Morphology, Micromorphology and Genesis of an Endoaquept in Bangladesh.

Sheikh M. F. Rabbi, Khulna Univ, Soil Science Discipline, Khulna, 9208, Bangladesh and Syed Elahi, Dhaka Univ, Dept of Soil, Water and Environment, Dhaka, 1000, Bangladesh.

Bangladesh is characterized by tropical monsoon climate. Detailed description of soil genesis and micromorphological features of soils of Bangladesh is rather scanty. Soil samples of Fluvaquentic Endoaquept were collected from Ganges meander floodplain. The cambic horizon B was present at 15-38 cm depth and the soil structure was weak to moderate coarse prismatic, which indicated the immaturity of soil. Moderately thick dark grey cutans was present along the horizontal and vertical ped surfaces. The texture was silt loam; soil was calcareous and non saline throughout the profile. Micromorphological studies indicated that no definite type of structure was developed. Mineral particles were mainly anisotropic. The identifiable primary particles were quartz, plagioclase feldspar, hornblende, muscovite and biotite. The ratio of fine silt to total silt was inconsistent and indicated the possibility of neo-genesis of clay. The primary minerals such as muscovite, microcline, albite and calcite were stable in the soil but anorthite was unstable.

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