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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/9933

Title: Comparative study between clay mineralogy and amorphous materials in different soil units of Wadi Bishah Basin
Authors: AI-Sewailem M.
A. Sh. Sallam
A. AI-Amry
Issue Date: 2002
Publisher: First Symposium of the Saudi Society of Agricultural Sciences, "Towards sustainable agricultural development
Abstract: Wadi Bisha is one of the important drainage systems in the southwestern region in Saudi Arabia. It receives water from many principal branches in the region. Characteristics of different soil units were quite variable as a result of parent materials source and other factors. This study was aimed to study clay minerals and amorphous materials formation in profiles collected along the wadi. Amorphous materials and free iron and manganese oxides were extracted and determined. Clay fraction was separated from selected soil profile samples and identified. Results indicated that the contents of Fwe2O3 and MnO2 in the flood plain soils were (1.98 – 16.73) and (0.08 – 0.77) g kg-1 soil respectively. While amorphous aluminosilicates range from 0.38 – 2.59 g kg-1. Relatively higher contents of these materials were found in southern parts compared with the northern part of the wadi. Contents of Fe2O3, MnO2 and amorphous aluminosilicates in the wadi bottom soils were (2.00 - 4.85), (0.05 – 0.26) and (1.57 – 2.59) g kg-1 respectively. On the other hand, mountainous residual soils were quite higher in the content of these materials and ranges from (3.20 – 58.11), (0.37 – 3.33) and (7.34 – 24.55) g kg-1 respectively. Clay fraction in the flood plain soils was dominated by kaolinite, smectite and interstratified minerals followed by low quantities of chlorite, illite and vermiculite. Mountainous residual soils were dominated by kaolinite while smectite minerals were present in these soils in the interstratified form, such as, smectite – chlorite, smectite - vermiculite and or chorinzite mineral. Formation and transformations of clay minerals were discissed in relation to source of parent materials and others factors.
URI: http://hdl.handle.net/123456789/9933
Appears in Collections:College of Foods And Agricultural Science

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