Fig 2. Effect of method of determination (HPLC/IC and ICP-OES) on mean concentration of exchangeable and water-soluble forms of Al (total AlKCl and total AlH2O; and Σ Al, all Al forms positively charged) at the end of the experiment.

Treatment abbreviations: LC—Litavka control soil without any additive, LCa—Litavka soil with lime, LP—Litavka soil with superphosphate, MC—Malín control soil without any additive, MCa—Malín soil with lime, and MP—Malín soil with superphosphate. Error bars represent SE. Based on Kruskal-Wallis test, differences between methods of determination were significant at 0.05 (*) and 0.01 (**) probability levels. Using multiple comparisons of mean ranks, methods of determination with the same letter were not significantly different.