The aim of the presented study was to prepare the phosphate sorption isotherms of 20 European volcanic soil profiles and some other Hungarian and German volcanic soils (n = 114) used in the experiment and to establish the soil characteristics determining the phosphate sorption capacity of these soils. The Langmuir isotherm well describes the phosphate sorption of European volcanic soils at bright concentration interval 0–600 mg·dm -3 P. The calculated phosphate adsorption maximum (P max ) is an excellent soil property for characterizing the surface activity of soils developed on volcanic parent material. The calculated phosphate sorption maxima of soils included in the experiment ranged from 0 to 10.000 mg P·kg -1 . Some of the volcanic soils sorbed a high ratio of the added phosphate at low concentrations, while others sorbed somewhat less. The difference in the phosphate binding affinity of soils caused the differences in the shape of the Langmuir adsorption isotherms. P retention % is a WRB diagnostic requirement of andic soil horizon. It was supposed that the phosphate sorption maximum (P max ) gives a better characterization of the surface reactivity of volcanic soils. As it was predicted, oxalate soluble Al is the most important soil property, which dominantly (in 73%) explained the phosphate sorption ability of European volcanic soils.
Balkovic, J. & Slivkova, K., 2002. Phosphorus retention in volcanic soils of Slovakia. Phytopedon. (Bratislava) 1. 78–85.
Buurman, P. et al., 2007. The physico-chemical data base. In: Soils of Volcanic Regions in Europe (Eds: Arnalds, O. et al.) 29–42. Springer Verlag. Berlin–Heidelberg.
Espino-Mesa, A., Arbelo, C. D. & Hernandez-Moreno, J. M., 1993. Predicting value of diagnostic soil properties on actual and potential cation exchange capacity (CEC) in andisols and andic soils. Commun. Soil Sci. Plant Anal. 24. (19–20) 2569–2584.
Füleky, Gy. & Jakab, S., 2007. Phosphate adsorption on soils in the Gurghiu and Harghita Mountains, Romania. Carpathian Journal of Earth and Environmental Sci. (North University of Baia Mare, Romania) 2. (1) 25–32.
ISSS–ISRIC–FAO, 1998. World Reference Base for Soil Resources. World Soil Res. Report No. 84. FAO. Rome.
Mizota, C. & van Reewirjk, P., 1989. Clay Mineralogy and Chemistry of Soils Formed in Volcanic Material in Diverse Climatic Regions. ISRIC. Wageningen.
van Ranst, E. et al., 2004. Surface reactivity of andisols on volcanic ash along the Sunda arc crossing Java Island, Indonesia. Geoderma. 123. (3–4) 193–203.