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Characteristics and genesis of some sodic soils in the indo gangetic alluvial plains of haryana and uttar pradesh india



Characteristics and genesis of some sodic soils in the indo gangetic alluvial plains of haryana and uttar pradesh india



Journal of the Indian Society of Soil Science 29(1): 61-70



Sodic soils in the states of Haryana and Uttar Pradesh forming a part of the Indo-Gangetic alluvial plain begin to appear on the soilscape surfaces of the Pleistocene age. These soils generally occupy micro-depressions of about 20-30 cm depth. Release of salts in the Siwalik/piedmont zone and the plains through alkali hydrolysis during the weathering of aluminosilicate minerals and their repeated convergence into micro-depressions lead to the genesis of these sodic soils at the surface, where good quality ground water occurs in the substratum. Sodic environment favors degradation of aluminosilicate minerals resulting in accumulation of amorphous silica, alumina, K and Fe. Degradation is maximum at the surface and decreases with depth as does the degree of sodicity. Weathering of mica present in these soils yields finer constituents of clay which preferentially move downwards in highly deflocculated form and give rise to an illuvial B horizon.

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