The forms of aluminium in Stagnosols in Serbia
2007
Mrvic, V.,Institute of Soil Science, Belgrade (Serbia) | Jakovljevic, M.,Faculty of Agriculture, Belgrade (Serbia) | Stevanovic, D.,Faculty of Agriculture, Belgrade (Serbia) | Cakmak, D.,Institute of Soil Science, Belgrade (Serbia)
The interactive relations of Al forms and the most important characteristics of Stagnosols were researched to diagnose which factors are the best to control the content of phytotoxic Al forms. Exchangeable Al (AlKCl) concentrations ranged from 0.0 to 560.7 mg/kg and increased with soil depth. This high variation depended on the changes of all forms of soil acidity and the degree of base cation saturation. Their relation was best described by a non-linear function. Concentrations of total Al and Al extracted by ammonium oxalate in dark (Al amorphous, Aloxa) increased with depth as well as the levels of clay particles. The values of Al extracted by sodium citrate/dithionite (Al crystalline, Aldit), 0.5M CuCl2 (AlCu) and 0.25M EDTA (AlEDTA) were in good correlation; they predominantly depended on soil acidity. The value of AlCu-AlKCl (in eluvial horizons) was best represented by organically bound Al. Effects of the reserves of Al Aldit, AlCu and AlEDTA on the changes of exchangeable Al were higher (medium and high correlation), while the effects of the total Al and Aloxa were lower.
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