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Release of non exchangeable sodium from saline water irrigated vertic ustochrepts



Release of non exchangeable sodium from saline water irrigated vertic ustochrepts



Journal of the Indian Society of Soil Science 33(2): 297-303



Soils irrigated with different SAR [Na adsorption ratio] water were repeatedly extracted with normal potassium and magnesium acetate (KOAc and MgOAc) to find the release of non-exchangeable sodium and changes in its cationic bonding energy during leaching. The release of Na decreased rapidly with progressive extraction. KOAc extracted more sodium than MgOAc but the differences were small to detect significant amounts of non-exchangeable Na and zeolite. Quasicrystal formation and differences in hydration state seemed to cause partial immobilisation of sodium in case of MgOAc extraction. The CEC [cation exchange capacity] of K-saturated soil was slightly higher than the Mg-saturated one. The ESP [exhangeable Na percentage] determined by using these values differed slightly but correlated significantly (r = 0.99) with the routine method. The sodium was loosely bound with the clay in soils irrigated with waters having SAR of 19 and more. The bonding of sodium increased with repeated extractions. The results indicated that reclamation of soils irrigated with high SAR water would require more amendment.

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Accession: 006306161

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