Naslov
Comparison between methods for determining soil cation exchange capacity of soils with different pH reaction

Autori
Vladimir Zebec ; Domagoj Rastija ; Darko Kerovec ; Zoran Semialjac ; Zdenko Lončarić

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Book of abstracts 12 Congress of the Croatian Society of Soil Scienece / Milan Poljak - Zagreb, 2014, 49-49

ISBN
978-953-58241-0-7

Skup
Sustainable soil managment for food and environment safety

Mjesto i datum
Dubrovnik, Hrvatska, 22.09.2014. - 26.09.2014

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Nije recenziran

Ključne riječi
soil ; cation exchange capacity ; ammonium acetate ; barium chloride

Sažetak
The aim of this paper was to compare methods for determining cation exchange capacity (CEC) of soils with different pH reaction. Various methods have been proposed for assessing the CEC of soils. Soil testing laboratories do not usually provide a direct measure of CEC. Instead, a pH 7 buffered ammonium acetate (AA) solution and hydrolytic acidity determination are the most widely used methods. The results represents the total extracted calcium, magnesium, potassium, sodium and acid cations (expressed as c mol(+) kg-1 of soil). Ninety five soil samples (grouped in 2 pHKCl classes: <5-5 and >5, 5) were collected in eastern Croatia and used for two methods for determining CEC. The tested methods are the sum of cations displaced with ammonium acetate or barium chloride (exchangeable Ba after saturation with BaCl2 and replacement with MgSO4). Simple linear correlations were carried out to study the relationship between used methods. Analytical results of soil properties ranged as follows: pHKCl from 3, 27 to 7, 91 (average 5, 22) ; organic matter content from 0, 83% to 5, 28 % (average 2, 33 %), carbonate content (pH>5, 5) from 0, 85% to 16, 13% (average 4, 26%) and clay content range from 10, 7% to 58, 8 % (average 25, 43 %). The mean values of CEC was 17, 81 c mol(+) kg-1 (AA) and 21, 23 c mol(+) kg-1 (BaCl2). There was a highly significant correlation between the AA and BaCl2 methods for CEC with a coefficient of determination R2= 0, 82 (n=95). For the noncarbonated soils (pH <5, 5) determination coefficient was R2=0, 94 (n=65) while determination coefficient for carbonated soils (pH>5, 5) was R2=0, 61 (n=30). According to the obtained results, it could be concluded suitability of the method to be used depend on soil pH and soil carbonate content.

Izvorni jezik
Engleski

Znanstvena područja
Poljoprivreda (agronomija)

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