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A Study on Some Black Terai Soils of Bangladesh

M. J. UDDIN
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

A. HAKIM
Department of Soil Science, University of Chittagong, Chittagong Bangladesh.

M. K. HASAN
Institute of Disaster Management and Vulnerability Studies,University of Dhaka, Dhaka-1000, Bangladesh

Abstract/ Executive Summary:

Three pedons studied representing the Bhajanpur, Panchagarh and Ruhea of the Black Terai soils (Humic Dystrudepts) indicated that maximum genetic color development has taken in the upper zone due to significant contribution of organic matter. Sand was the dominant fraction with higher sand: silt ratio. The soils were acidic in nature with low C and N content and CEC. Ca2+ was the dominant cation where as Mg2+ was very scanty. Bulk mineralogical analysis showed that soils were enriched with quartz, muscovite or potash mica, orthoclase, illite and zeolite.

Keywords: Black Terai Soils, Soil properties

Location: Bhajanpur, Panchagarh and Ruhea of the Black Terai soils (Humic Dystrudepts)

Start Date: 01-02-2010

End Date: 28-02-2010

Program Area: Crop-Soil-Water Management

Commodity: Land degradation

Objectives:

1. To assess the physicochemical properties of the Black Terai soils of the Himalayan piedmont floodplain.

Methodology:

Three pedons representing the major series of the Black Terai soils comprising of Bhajanpur (Humic Endoaquepts), Ruhea (Humic Dystrudepts), and Panchagarh (Humic Dystrudepts) belonging to Panchagarh district were taken into consideration. A total of 20 soil samples were collected in the month of February 2010. The morphological description of the pedons was made according to USDA. Soil organic carbon, total nitrogen and soil pH was determined with a pH meter at a soil- solution ratio of 1:2.5. The particle size analysis was determined by hydrometer method and that of textural classes by Soil Survey Staff. Ammonium acetate extractable Ca and Mg were determined by Atomic Absorption Spectrophotometer, while K+ and Na+ were determined by Flame photometer. Identification of bulk minerals of surface soils of Bhajanpur and Panchagarh was made on the basis of their characteristic basal reflections.

Source of Information: J. Asiat. Soc. Bangladesh, Sci. 40(1): 61-65, June 2014

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

In Bhajanpur soil, the bulk minerals identified were quartz, muscovite (potash mica), zeolite and illite whereas those in the Panchagarh soil, were quartz, muscovite (potash mica), orthoclase and bytownite. The occurrence of minerals in Bhajanpur and Panchagarh soils followed the order Quartz>Muscovite or potash mica>Zeolite>Illite, and Quartz>bytownite>Orthoclase>Muscovite or potash mica respectively. In the Black Terai soils, the main magnesium bearing mineral appears to be mica (Huizing 1970), which during transformation to expanding lattice minerals may not release appreciable amount of magnesium.

Knowledge Management: Journal