. 2015 Apr 16;10(4):e0123351. doi: 10.1371/journal.pone.0123351

Table 1. Effect of treatment on soil pH (CaCl2, AA, CA, and OA), pseudo-total (mg/kg; extracted by Aqua regia; AR), exchangeable (mg/kg; extracted by 0.5 mol/L KCl or by 0.01 mol/L CaCl2), water-soluble (mg/kg; extracted by deionised water; H2O), exchangeable and carbonate (mg/kg; extracted by 0.11 mol/L acetic acid; AA), and exchangeable, carbonate, and reducible (mg/kg; extracted by 0.11 mol/L citric acid; CA or by 0.11 mol/L oxalic acid; OA) concentration of Al (mean ± SE) at the end of the experiment.

Variable	Treatment
	LC	LCa	LP	MC	MCa	MP
pH_CaCl2 **	5.8^b ± 0.01	7.5^a ± 0.01	5.9^b ± 0.02	7.2^ab ± 0.03	7.6^a ± 0.02	7.2^ab ± 0.01
pH_AA **	3.9^b ± 0.01	4.3^ab ± 0.03	3.9^b ± 0.003	4.6^ab ± 0.03	5.0^a ± 0.02	4.6^ab ± 0.01
pH_CA **	2.3^b ± 0.01	2.5^abc ± 0.02	2.3^bc ± 0.01	2.5^ac ± 0.01	2.7^a ± 0.02	2.5^ac ± 0.02
pH_OA **	1.4^b ± 0.01	1.4^ab ± 0.01	1.4^b ± 0.02	1.4^ab ± 0.01	1.4^a ± 0.01	1.4^ab ± 0.01
Al_AR *	11067^b ± 317	-	-	13482^a ± 595	-	-
Al_KCl ^n.s.	11^a ± 0.1	9^a ± 0.1	10^a ± 2	10^a ± 1	12^a ± 1	11^a ± 1
Al_CaCl2 *	12^ab ± 1	9^b ± 1	15^ab ± 3	11^ab ± 1	18^a ± 1	13^ab ± 1
Al_H2O **	81^ab ± 3	70^abc ± 2	106^a ± 5	22^bc ± 1	15^c ± 1	21^bc ± 1
Al_AA *	113^a ± 11	102^ab ± 21	86^ab ± 8	59^a ± 3	80^ab ± 4	69^ab ± 6
Al_CA **	1188^ab ± 9	1197^ab ± 7	1149^b ± 5	1968^a ± 8	1896^ab ± 2	1974^a ± 4
Al_OA **	3070^ab ± 5	2940^b ± 42	2972^b ± 17	5119^a ± 35	4908^ab ± 8	5052^a ± 25

– indicates not determined

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.