Table 2. Effect of treatment on exchangeable and water-soluble forms of Al (mg/kg; species: Al(X)1+, Al(Y)2+, Al3+; and Σ Al—all Al forms positively charged; total AlKCl and total AlH2O; mean ± SE) at the end of the experiment.
| Extracting reagent | Variable | Treatment | |||||
|---|---|---|---|---|---|---|---|
| LC | LCa | LP | MC | MCa | MP | ||
| KCl | Al(X)1+ ** | 5.5abc ± 0.1 | 11.8a ± 0.3 | 5.7abc ± 0.1 | 5.2c ± 0.04 | 7.5ab ± 0.1 | 5.4c ± 0.05 |
| Al(Y)2+ | <0.5 | <0.5 | <0.5 | <0.5 | <0.5 | <0.5 | |
| Al3+ | <0.5 | <0.5 | <0.5 | <0.5 | <0.5 | <0.5 | |
| Σ Al ** | 5.5abc ± 0.1 | 11.8a ± 0.3 | 5.7abc ± 0.1 | 5.2c ± 0.04 | 7.5ab ± 0.1 | 5.4c ± 0.05 | |
| AlKCl n.s. | 11a ± 0.1 | 9a ± 0.1 | 10a ± 2 | 10a ± 1 | 12a ± 1 | 11a ± 1 | |
| H2O | Al(X)1+ ** | 3.3ab ± 0.1 | 5.8a ± 0.3 | 3.5ab ± 0.1 | 2.8b ± 0.1 | 4.0a ± 0.04 | 3.2ab ± 0.1 |
| Al(Y)2+ * | <0.5 | 0.9a ± 0.1 | 0.6b ± 0.05 | <0.5 | <0.5 | <0.5 | |
| Al3+ n.s. | <0.5 | 0.7a ± 0.1 | 0.6a ± 0.1 | <0.5 | <0.5 | <0.5 | |
| Σ Al ** | 3.3abc ± 0.1 | 7.4a ± 0.4 | 4.8ab ± 0.1 | 2.8c ± 0.05 | 4.0abc ± 0.04 | 3.2bc ± 0.1 | |
| AlH2O ** | 81ab ± 3 | 70abc ± 2 | 106a ± 5 | 22bc ± 1 | 15c ± 1 | 21bc ± 1 | |
limit of detection (mg/kg): 0.5
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.
Calculated by Kruskal-Wallis test, differences between treatments were not statistically significant (n.s.) or were significant at 0.05 (*) and 0.01 (**) probability levels. According to the multiple comparisons of mean ranks, treatments with the same letter were not significantly different.