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Morphology, Micromorphology and Mineralogy of a Pedon of Sara Soil Series (fluvaquentic Endoaquept)

S. M. F. Rabbi
Corresponding authority, Soil Science Discipline, Khuln a University, Khulna-9208, Bangladesh.

S. F. Elahi
Professor
Department of Soil, Water and Environment, University of Dhaka, Dhaka-1000; Bangladesh.

M. M. Ahsan
Soil Resource Development Institute, Dhaka-1215, Bangladesh

K. Q. Kibria
Corresponding authority, Soil Science Discipline, Khuln a University, Khulna-9208, Bangladesh.

M. S. Islam
Corresponding authority, Soil Science Discipline, Khuln a University, Khulna-9208, Bangladesh.

Abstract/ Executive Summary:

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 indicates the immaturity of soil. Moderately thick dark gray 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 indicate 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 dominant clay minerals identified by XRD method were illite (mica), chlorite, kaolinite and montmorillonite. 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. In the base rich environment illite was very much stable but formation of Mg-montmorillonite and chlorite was likely to occur in the soil.

Keywords: Soil, Sara soil series, Gangage river floodplain,

Location: Jessore district, Bangladesh

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Non-commodity: Land management

Objectives:

To study the soil characteristics, micromorphology and mineralogy of Sara soil series of Ganges River Floodplain.

Methodology:

Soil samples of Sara series (Fluvaquentic Endoaquept) were collected from Jessore district. The physiography of sampling area was Ganges Meander Floodplain. The relief of the landscape was slightly irregular and drainage was imperfect. For description of soil morphology a lm x lm x Im pit was excavated. Soil description was made according to Soil Survey Staff. Undisturbed soil samples for micromorphological studies were taken in 10 cm x Scm x 3.5cm Kubiena box from different horizons. The thin section was prepared and described according to Fitzpatric. Soil samples were air dried and passed through 2mm sieve prior to analysis. The particle size was determined by the method as described. For the XRD analysis the surface soil sample was pretreated as described. The clay fraction of soil was separated by siphoning as described. Soil pH (2: I) and ECe were determined electrochemically. Soil organic carbon was determined by wet oxidation method. The CEC of soil was determined by treating the soil with IN NH₄ 0AC solution (pH 7.0) followed by replacing ammonium from the exchange site by 2M KCI. The concentration of ammonium in the solution was determined. For the determination of exchangeable Na+ and K+ soil was extracted with IN NH₄ 0AC solution (pH 7.0) as described. Water soluble calcium, sodium and potassium was determined after extraction with distilled water by Flame Photometer.

Source of Information: Bangladesh J. Soil Sci. 30(1-2): 9-17, 2004, ISSN 0253-5440

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The texture was silt loam; soil was calcareous and non saline throughout the profile. Micromorphological studies indicate 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 dominant clay minerals identified by XRD method were illite (mica), chlorite, kaolinite and montmorillonite. 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. In the base rich environment illite was very much stable but formation of Mg-montmorillonite and chlorite was likely to occur in the soil.

Knowledge Management: Journal