Research Article

Extractable Al and Soil Solution Ionic Concentrations in Strongly Leached Soils from Northwest Iberia: Effects of Liming

Table 6

Total concentration of iron (Fe+3), aluminium (Al+3), manganese (Mn+2), zinc (Zn+2), sulfate ( S O 4 2 ), and phosphate ( P O 4 3 ) ions (μM L−1) in unlimed (control) and limed studied soil solutions, as determined by inductively coupled plasma atomic emission spectrometry Symbol: DL: detection limit (Al+3 = 0.25, Mn+2 = 0.03, Zn+2 = 0.06, S O 4 2 = 0.002, and P O 4 3 = 0.006 μM L−1, resp.). Means in the same horizon followed by different letters in column are significant at 𝑃 < 0 . 0 5 by the Tukey test.

PedonHorizonCaCO3 addedFe+3Al+3Mn+4Zn+2Cu+2 S O 4 2 P O 4 3
(t ha−1)(μM L−1)

Umbrisols
1Ah1022a104630a3a0.34041a
26b<DL2b0.9b<DL<DL0.8b
45b<DL1b0.6b<DL<DL0.7b
63b<DL0.4b0.5b<DL<DL0.3b

3Ah10202a44413a2a0.25102
22b<DL1b2a<DL<DL<DL
42b<DL0.4b0.9b<DL<DL<DL
61b<DL<DL<DL<DL<DL<DL

4Ah1030a7853a2a0.788310a
22b<DL0.4b0.6b<DL<DL1.0b
41b<DL<DL0.6b<DL<DL0.7b
61b<DL<DL<DL<DL<DL<DL

Cambisols
5Ah05a13454a2a0.264253a
22b<DL1b0.6b<DL<DL0.5b
42b<DL1b0.5b<DL<DL0.3b
61b<DL0.4b<DL<DL<DL<DL

6Ah109a28032a40.244662a
23b<DL1b1<DL<DL0.1b
42b<DL<DL<DL<DL<DL0.1b
62b<DL<DL<DL<DL<DL<DL

Luvisols
7Ah023a17823a2a0.37943
213b<DL0.4b0.6b<DL<DL0.4
412b<DL<DL<DL<DL<DL<DL
69b<DL<DL<DL<DL<DL<DL

8Bt011a1015a2a0.13987a
24b<DL3b1a<DL<DL1b
43b<DL2b0.6<DL<DL0.9b
62b<DL<DL<DL<DL<DL0.7b

Regosols
10Ah0162a111650a110a1.359920.4a
24b<DL6b8b<DL<DL0.3a
43b<DL0.7b0.6c<DL<DL0.1a
62b<DL0.4b0.6c<DL<DL<DL

11Ah023a50138a1a0.24891a
218b<DL2b0.6b<DL<DL0.4b
411b<DL1b<DL<DL<DL0.4b
65b<DL0.4b<DL<DL<DL0.2b