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CLAY MINERALOGY INFLUENCE ON THE PHYSICAL AND CHEMICAL PROPERTIES OF VERTISOLS FROM ROMANIA

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Author(s): Victoria Mocanu | C. Craciun | M. Eftene | Sorina Dumitru | Valentina Cotet

Journal: Soil Forming Factors and Processes from the Temperate Zone
ISSN 1582-4616

Volume: 7;
Issue: 1;
Start page: 107;
Date: 2008;
Original page

Keywords: vertosol | clay minerals

ABSTRACT
The mineralogical investigation of the 33 profiles of vertisol from Romania indicated that there are two principal geographical zones with vertisols (West and South) which present some quantitative mineralogical differences at the colloidal level. In spite of the fact that in all investigated profiles, the quantitative mineralogical composition of the clay fraction (below 2μ) was the same, (smectite, illite and kaolinite) the vertisols from the western zone show a higher content of smectite (montmorillonite) and a lower content of illite in comparison with vertisols from southern zone. The correlations between some physical indices of soil and smectite quantity indicated that an increase of soil smectite content determines an increase of bulk density and compaction degree, concomitantly with a decrease of total porosity and air porosity. The established relationships between some chemical indices and mineralogical parameters indicated that cation exchange properties and reaction of these soils appear more closely related to the quality (mineralogical composition) than to the quantity of clay fraction. The empirical relationships established between physical and chemical indices of vertisols and mineralogical parameters suggest that in some cases, considered favorable, the clay mineral information could allow some predictions on the physical and chemical properties, in spite of the fact that such of predictions have a limited value from quantitative point of view.
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