Methods for the determination of the form of aluminium: Pseudogley soils

Abstract

Exchangeable aluminium (AlKCl) and CaCl2-extractable aluminium (AlCaCl2) have approximately the same value in the prognosis of detrimental effect on plants. Additional, more in-depth research should show which of the two applied methods of exchangeable Al determination is more suitable (after Sokolov or using aluminon). The contents of total Al and amorphous Al increase with depth and percentage clay. Crystalline Al oxides and CuCl2-extractable aluminium (AlCaCl2) and EDTA-extractable aluminium (AlEDTA) represent the more mobile reserves of Al and they depend mostly on changes in the acidity parameters of the soil. Exchangeable Al is on average 4.3-4.7 times lower than the contents of AlCaCl2 and AlEDTA, 8 times lower than crystalline Al and 35 times lower than amorphous Al. Some methods are not sufficiently selective, hence further research is required to achieve more favorable methods for the determination of the different forms of Al.

Keywords

• exchangeable al
• al oxalate
• al dithionate
• cucl2 extractable al
• organic al