Asian Journal of Microbiology, Biotechnology & Environmental Sciences Paper

Vol.13, Issue 3, 2011; Page No.(557-560)

ENVIRONMENT OF WATER SOLUBLE SALTS IN SOILS UNDER DIFFERENT LAND USE SYSTEMS

H.V. RUDRAMURTHY, Y.P. SHILPASHREE AND E.T. PUTTAIAH

Abstract

Irrespective of the land use systems soluble salts concentration (EC) was comparatively more in the surface horizons than in the immediate subsurface horizons and however in sub-soil Solum water extractable ions showed more or less increasing trend with depth. Soils under cultivated land use systems recorded higher EC values especially at the surface than in that of mixed forest land use ecosystem. Among the water extractable cations calcium was the dominant ion in the soils under current follow, mixed forest, paddy and sugarcane land use systems, whereas in that of tobacco and areca nut land use systems magnesium was the dominant ion. While sodium ion was the dominant in the Solum of areca nut and in the lowest horizons of mixed forest land use systems. Among the water extractable anions, bicarbonates and carbonates were the dominant in the solum and sub-soil solum of the soils under areca nut and mixed forest land use systems respectively and in the soils under remaining land use systems chlorides and sulphates were the dominant ions. Soils under all the land use systems were found to be non-saline as the values of sodium adsorption ratio and EC were less than 13 and 0.4 dS m-1 respectively. Both soluble salts concentration and sodium adsorption ratio were positively and significantly correlated with pH and water extractable sodium, magnesium and bicarbonates. Silt was positively and significantly correlated with sodium adsorption ratio while chlorides and sulphates were positively and significantly correlated with soluble salt concentration.

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