EFFECT OF PHYSIOGRAPHIC POSITION ON SOME PROPERTIES OF  ALLUVIAL SOILS  AND CLAY PANS IN PROVINCE  OF BASRAH - SOILS TAXONOMY -

A. Kadhim, M.; H . Dheyab, A.; R. Nedawi, D.

	EFFECT OF PHYSIOGRAPHIC POSITION ON SOME PROPERTIES OF ALLUVIAL SOILS AND CLAY PANS IN PROVINCE OF BASRAH - SOILS TAXONOMY -
The Iraqi Journal of Agricultural Science
Article 1, Volume 43, Issue 0, 2013, Pages 48-57
Authors
M. A. Kadhim; A. H . Dheyab; D. R. Nedawi
Abstract
This study was conducted to determine the effect of physiographic position on some properties alluvial soils at Mesopotamia plain in Basrah, focusing on the clay pans at three locations and classification of these soils. The study area was chosen in west of shatt Al-arab river which including the following physiographic positions: river levees, flood plain and marsh land. Foure strips were indentified and the first strip was included three representing pedons for the physiographic position as Abou mohammer, Aldeir, Al–khmauge and Talha regions. The study showed that there was a variation soil particles content in both vertical and horizontal directions with dominance of clay and silt particles, this is because of the sedimentation of these particles rate according to distance from the source (river). This variation of soil particles affected on soil bulk density and soil compactability. Some horizons of these soils were similar to clay pans. Morphological, physical and chemical properties of the studied pedons indicated that all pedons belong to Entisols order and Fluvents suborder,Torrifluvents great group, Typic Torrifluvents as sub group. Seven series were identified in study area including (TM465, MM12, DF127, MF9, DM97, TW565, and DM116) and 2 new series were found (TM1274, TM1165).

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