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Aggregate Stability of Ganges Tidal Floodplain Soils and Its Relationship with Soil Physical and Chemical Properties

S. M. F. Rabbi
Soil Science Discipline, Khulna University, Khulna-9208, Bangladesh

K. Q. Kibria
Soil Science Discipline, Khulna University, Khulna-9208, Bangladesh

M. S. Islam
Soil Science Discipline, Khulna University, Khulna-9208, Bangladesh

M. Ahsan

A. Rahman
Soil Science Discipline, Khulna University, Khulna-9208, Bangladesh

M. R. Bhuiyan
Soil Science Discipline, Khulna University, Khulna-9208, Bangladesh

Abstract/ Executive Summary:

Water stability of Bajoa (Typic Endoaquept), Ramgati (Typic Endoaquept) and Barisal (Typic Endoaquept) soil series of Ganges Tidal Floodplain was determined. Physical and chemical properties were also determined. Mean weight diameter (MWD) and percent water stable aggregates (%WSA) were higher in Bajoa and Barisal than Ramgati series. Percentages of clay, silt and soil organic matter (SOM) were the three cardinal factors affecting aggregate stability of soils. The relative importance of silt and clay over SOM was evident. Largely the magnitude of aggregate stability was attributed by the percent of silt content of the soil

Keywords: Floodplain soil, Soil, Ganges tidal floodplain

Location: Ganges tidal floodplain, Bangladesh

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Non-commodity: Land development productivity

Objectives:

To evaluate the aggregate stability of Bajoa, Ramgati and Barisal series and factors affecting their stability

Methodology:

Bajoa (Typic Endoaquept), Ramgati (Typic Endoaquept) and Barisal (Typic Endoaquept) soil series were collected from Ganges tidal floodplain. A master (1m x lm xlm) pit was excavated to describe and collect samples from each horizon. The undisturbed soil samples were collected in 10 em x 5 cm blocks. The soil samples were then air dried and prepared for analysis. The particle size analysis of the soils was carried out by combination of sieving and hydrometer method as described. Textural classes were determined using Marshall's Triangular Coordinator system. Bulk density of soil was determined by core method as described by Blake and Hartge (1986). Particle density was determined by pycnometer as described and total porosity was calculated from bulk and particle densities. Soil structure was evaluated by microaggregate analysis of the soils following the method with the exception that a combination of sieving and hydrometer method was used to determine the particle size distribution instead of pipette method. The state of aggregation (>0.05 mm) and dispersion factor were calculated. Hydraulic conductivity of soil was determined in the laboratory by constant head method. In aggregate sieving analysis the aggregates passed through 8mm sieve but retained on 4mm sieve were used. Dry and wet sieving analyses were performed according to the methods as described. For dry and wet sieving 2mm, 1 mm, 0.5mm and 0.25mm sieves were used. Change in mean weight diameter (CMWD) = MWDdry - MWDwet. Water stable aggregates (WSA) = Total sample analyzed / Sample retained on a specific sieve x 100. %WSA= 100 x {(Total sample weight)-( weight of priman - particles)} / {(weight retained)- (weight of primary particles)}. Soil pH was determined electrochemically with the help of glass electrode pH meter as suggested by Jackson (1973). The electrical conductivity of the soil was measured at a soil: water ratio of 1:2 by EC meter. Soil organic carbon was determined by wet oxidation method. The CEC of soil was determined by extracting the soil with IN NH₄ OAc solution (pH 7.0) followed by replacing ammonium from the exchange site by 2M KCI. The concentration of ammonium in the solution was determined. Exchangeable N a+, ca2+ and K+ was extracted with IN NH₄OAc solution (pH 7.0) as described and then was analyzed by flame photometer. Water soluble sodium and potassium was determined by flame photometer after extraction with distilled water.

Source of Information: Bangladesh J. Soil Sci. 30(1-2): 61-69, 2004, ISSN 0253-5440

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

They concluded that soils with high amounts of silt and fine sand dispersed easily, while stable soils were generally related to the sum of coarse sand and clay. Schnitzer and Kodama (1992) reported that percentage of organic carbon associated with fine sand and silt particles was much lower than which associated with clay particles. This may be responsible for collapse of aggregates containing high silt percentage. Percentages of clay, silt and soil organic matter (SOM) were the three cardinal factors affecting aggregate stability of soils. The relative importance of silt and clay over SOM was evident. Largely the magnitude of aggregate stability was attributed by the percent of silt content of the soil.

Knowledge Management: Journal