Effect of soil parameters on distribution of aluminium in soils of the Slovak Republic

Paper is focused on distribution of aluminium in soils as well as on testing of relationships between selected soil parametres and content of aluminium in individual fractions. A methodological process of selective sequential extraction according to Zeien and Brummer has been used for a file of 25 soil samples representing eight soil types (Haplic Chernozems, Mollic Fluvisols, Gleic Stagnosols, Eutric Fluvisols, Skeletic Leptosols, Haplic Luvisols, Dystric Cambisols, Haplic Podzols) to evaluate bonds of aluminium considering particular soil components. The distribution of aluminium was analysed in depth 0-10 cm, because the plant uptake is very active just in this depth. Seven fractions of aluminium were analysed: mobile (mob.), easily mobile (eas. mob.), occluded on Mn-oxides (occl. Mn), bound to organic matter (b.o.m.), bound by amorphous Fe-oxides (b.am. Fe), bound by crystallized Fe-oxides (b.cr. Fe) and residual fraction (res.). The Statgraphic 5.0 was used. The total content of aluminium was from 2957 to 23 773 mg.kg/1. The content in individual fractions increased in the order: occl. Mn (0.07 %) eas.mob. (0.09 %) mob. (1.37 %) b.o.m. (1.89 %) b.am. Fe (6.58 %) b.cr. Fe (9.96 %) res. (80.60 %). The mobile fraction is very important in the view of plant uptake. Average content of mobile aluminium was in range 1.25 - 925.30 mg per kg and increased in soil types in the order: Haplic Chernozems (1.98 mg per kg) Haplic Luvisols (2.20 mg per kg) Mollic Fluvisols (2.47 mg per kg) Eutric Fluvisols (4.00 mg per kg) Gleic Stagnosols (7.08 mg per kg) Skeletic Leptosols (67.00) Dystric Cambisols (138.15 mg per kg)v Haplic Podzols (925.3 mg per kg ). High rate of mobile aluminium is contained in Haplic Podzols, low rate is characteristic for Haplic Chernozems, Haplic Luvisols and Mollic Fluvisols. In the course of Spearmann regression of aluminium fractions and selected soil parametres testing, it was determined statistically important interaction between mobile aluminium and soil reaction (r