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Characterization of Some Representative Soils from the Ganges Floodplain of Bangladesh

M. K. Hasan
Department of Soil, Water and Environment, University of Dhaka, Dhaka‐1000, Bangladesh

A. S. M. Mohiuddin
Department of Soil, Water and Environment, University of Dhaka, Dhaka‐1000, Bangladesh

M. J. Uddin
Department of Soil, Water and Environment, University of Dhaka, Dhaka‐1000, Bangladesh

Abstract/ Executive Summary:

The present study was undertaken in examining the soil properties regarding their morphological, physical, chemical characteristics as well as their use potentials. A total of 22 soil samples were collected on natural horizon basis from four soil profiles for laboratory analyses representing the study sites. The soils were morphologically described in the field following the method of Soil Survey Manual(3). The soil samples were processed and analyzed in the laboratory. The particle size analysis of soils was carried out by combination of sieving and hydrometer methods as described by Day. Textural classes were determined by Marshell’s triangular coordinate curve as devised by USDA. The morphological, physical, chemical and physico?chemical properties of these soils clearly indicate that the soils are of alluvial origin. All the soils under investigation appear to be incompletely developed which means that these are still immature. The soils are presently used for rice cultivation during the dry season by irrigation with ground water. These soils therefore remain in waterlogged condition for most of the time of the year. The properties of the top soil are often altered by mechanical manipulation during cultivation when wet. As a result, structure formation in the surface soil has been disturbed constantly.

Keywords: Characterization, Hydromorphic soils, The Ganges Floodplain

Location: Department of Soil, Water and Environment, University of Dhaka

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Land development productivity

Objectives:

The present study was undertaken in examining the soil properties regarding their morphological, physical, chemical characteristics as well as their use potentials.

Methodology:

A total of 22 soil samples were collected on natural horizon basis from four soil profiles for laboratory analyses representing the study sites. The soils were morphologically described in the field following the method of Soil Survey Manual . The soil samples were processed and analyzed in the laboratory. The particle size analysis of soils was carried out by combination of sieving and hydrometer methods as described by Day. Textural classes were determined by Marshell’s triangular coordinate curve as devised by USDA. Hygroscopic moisture content of soils was determined by drying the air?dried soils in an oven at 105?110ºC. The pH (H₂O) of soils was determined at a soil water ratio of 1 : 25 using a glass electrode pH meter. The organic carbon content of soils was determined volumetrically by wet oxidation method as described by Jackson. Organic matter content was calculated by the Van Bemmelen factor 1.724. The total nitrogen in soils was determined by Kjeldahl’s method as described by Jackson.

Source of Information: Dhaka Univ. J. Biol. Sci. 21(2): July 2012; ISSN 1021-2484

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The morphological, physical, chemical and physico?chemical properties of these soils clearly indicate that the soils are of alluvial origin. All the soils under investigation appear to be incompletely developed which means that these are still immature. The soils are presently used for rice cultivation during the dry season by irrigation with ground water. These soils therefore remain in waterlogged condition for most of the time of the year. The properties of the top soil are often altered by mechanical manipulation during cultivation when wet. As a result, structure formation in the surface soil has been disturbed constantly.

Knowledge Management: Journal