Sodic Soils in the United States

561 WordsJan 31, 20182 Pages
In North America, sodic soils are mostly found in the northern Great Plains of the United States. Sodic soils develops on glacial deposits and till of saline shales (Heck and Mermut, 1992). The presence of a fluctuating water table, landscape position, topography, parent material permeability elevate the sodicity on glacial deposits (Wilding et al., 1963; Lewis and drew, 1973; Munn and Boehm, 1983; Seelig et al., 190; Richardson et al, 1992). The total area of North Dakota in the United States is about 18.4 million hectares and of these 1.9 million hectare area are considered as sodic and distributed across several parent materials (Web Soil Survey, 2013). Sodic soils are characterized by high sodium (Na) concentration in cation exchange complex. Which is about greater than 15% and defined as the soil with high sodium as compared to calcium and magnesium (Salcon, 1997, Soil Taxonomy, 1999). Sodic soil is one of the problematic soils which weaken the soil structure of the soils (Rengasamy and walters, 1994). So it is important to study these soil in detail by physical, chemical and micro morphological method and in relation to environment. The typical morphological or physical features of the area with sodic soils were study in the field. The vertical section from the surface were dig up to the parent material and designate them into different horizon on the basis of soils color, texture, structure etc. Sodic soils develop a dense prismatic or columnar structure below the

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