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University of Arizona (1969)

Surface area and related properties of some irrigated Arizona soils

Monadjemi, Mehdi

Titre : Surface area and related properties of some irrigated Arizona soils

Auteur : Monadjemi, Mehdi,

Université de soutenance : University of Arizona

Grade : Master of Science (MS) 1969

The purpose of this research was to study the surface area characteristics of representative irrigated Arizona soils and soil clays and its relationship to cation exchange capacity and per cent clay content. The Glycerol retention method developed by Kinter and Diamond (1958a) was used for the determination of surface area. Total soil surface area ranged from 24 m2 /g for Vinton loamy sand (5.8$ clay) to 148 m2 /g for Cashion clay (40.0$ clay). Total surface area of the less than two micron clay fraction varied from 221 m2 /g to 385 /g for Gila and Cashion soils respectively. These variations were mostly due to the type of clay minerals present in the samples. Total soil and soil clay surface area values were closely related to the cation exchange capacities of these two fractions with correlation coefficient values of O .98 and 0.95 respectively. Cation exchange capacity data were better correlated with total soil surface area than with external or internal surface area. A 0.95 correlation coefficient value was found between soil surface area and per cent clay content. It was concluded that a close estimation of cation exchange capacity or per cent clay con tent can be made from total soil surface area values. The influence of the removal of amorphus material on the soil clay surface area measurement by the glycerol retention was studied. Total surface area of all ten soil clay samples was increased after the removal of amorphus material. It was theorized that boiling the clay samples 2.5 minutes in o.5 N NaOH probably altered the structure.of the crystalline clay minerals. The increase in surface area might also be due to extreme dispersion of clay by the sodium.

Mots clés : Irrigation — Research — Arizona. ; Soils, Irrigated — Arizona.


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