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Characteristics of Some Bangladesh Soils I. Physical Characteristics

Md. Idris
Department of Soil Science Bangladesh Agricutural University, Myrnensingh.

Abul Hossain
Department of Soil Science Bangladesh Agricutural University, Myrnensingh.

Abstract/ Executive Summary:

Five different types of Bangladesh soils were analyzed for their physical characteristics. They are 'silty clay loams' and 'silt loams' in texture; low in bulk density ( 1.25 to 1.38 gjcm3 ) values; the total pore space is medium and varies from 43.75 to 48.13 %, the micro pores from 21.65 to 26.31, macro pores from 17.44 to 26.38 %. They have moderate water retaining capacity; the field capacity varies from 16.40 to 19.49%. The conductivity of the soils are moderate to moderately slow (0.84 to 5.51 ern /hr ). The plasticity index of the soils are very low and varies from 0.5 to 2.5.

Keywords: Soils, Physical characteristics

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Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Soil fertility

Objectives:

This paper presents the data on the physical properties of five different types of soils of this country.

Methodology:

The pulverized airdry soils, passed through a 10 mesh sieve, were used for the following physical analyses: a) Mechanical analysis, b) bulk density, c) particle density, d) soil porosity, e) water holding capacity, f) hydraulic conductivity,and h) soil consistency of the soils shown in the next page. Mechanical analysis was carried out by pipette sampling method as outlined by Piper (1950). Textural class was deter- mined by plotting the results on triangular diagram designed by Marshall (1947).

Source of Information: Bangladesh J. Agril. Sci. 3(2) : 120-129 : 1976

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Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The soils fall under two textural groups., The Texture of the Brahmaputra flood plain soil, the Madhupur soil and the Middle Meghna flood plain soil is 'silt loam', while the calcareous dark grey flood plain soil and the Saline tidal flood plain soil are 'silty clay / loams'. Silt loams are good for agricultural view points. They can easily be kept in a state of god tilth which is conducive to a rapid germination of seeds and to easy penetration by roots. Water drains through the soil with ample free- dom and yet considerable water is retained by the soil for plant use. Silty clay loam soil are more cohesive and water moves through it slowly. These soilc, however, are highly productive when skillfully tilled. Weir (1949) observed that fine textured soils like silt loam and clay loam have higher agricultural value being less susceptible to become loose and open.

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