Table 2.
Effects of adding 440 mg·kg−1 Si on the pH values, CEC, and concentrations of available Ca and available Na of six soils.
| Soils | Treatments | pH | CEC | Ca | Na |
|---|---|---|---|---|---|
| Cmol(+) kg−1 | mg kg−1 | mg kg−1 | |||
| Soil 1 | Control | 5.88 ± 0.16b | 16.517 ± 0.34b | 564 ± 12b | 34.5 ± 6.1b |
| Soil 2 | MS | 6.68 ± 0.14a | 18.441 ± 0.78a | 512 ± 21c | 228 ± 36a |
| WS | 6.90 ± 0.15a | 18.502 ± 0.13a | 839 ± 20a | 31.5 ± 5.7b | |
| Control | 4.06 ± 0.02b | 11.222 ± 0.08b | 20.4 ± 0.8b | 32.1 ± 1.6b | |
| Soil 3 | MS | 4.98 ± 0.17a | 12.729 ± 0.46a | 26.2 ± 4.5b | 239 ± 43a |
| WS | 5.07 ± 0.08a | 13.108 ± 0.21a | 221 ± 15a | 39.5 ± 1.6b | |
| Control | 5.40 ± 0.12b | 9.9 ± 0.28c | 207 ± 19b | 42.4 ± 5.2b | |
| Soil 4 | MS | 5.87 ± 0.13a | 12.821 ± 0.38a | 149 ± 12c | 251 ± 25.7a |
| WS | 5.77 ± 0.17a | 12.180 ± 0.26b | 434 ± 35a | 34.8 ± 3.3b | |
| Control | 6.21 ± 0.07b | 7.6 ± 0.3c | 215 ± 20b | 20.2 ± 3.5b | |
| Soil 5 | MS | 7.08 ± 0.12a | 9.0 ± 0.42b | 205 ± 23b | 248 ± 40a |
| WS | 7.10 ± 0.14a | 9.8 ± 0.29a | 442 ± 44a | 22.9 ± 5b | |
| Control | 5.28 ± 0.19b | 2.8 ± 0.4b | 23.5 ± 2.6b | 23.4 ± 4.6b | |
| Soil 6 | MS | 6.35 ± 0.11a | 4.9 ± 0.44ab | 22.2 ± 1.6b | 288 ± 20.7a |
| WS | 6.57 ± 0.08a | 5.7 ± 0.17a | 274 ± 39a | 26.3 ± 1.6b | |
| Control | 7.24 ± 0.19a | 15.354 ± 1.79a | 1433 ± 47ab | 34.66 ± 4.9b | |
| MS | 7.47 ± 0.15a | 16.900 ± 0.24a | 1395 ± 32b | 307 ± 30a | |
| WS | 7.24 ± 0.16a | 15.568 ± 0.89a | 1537 ± 97a | 39 ± 7b |
Control, non-amendment control; MS, 4A molecular sieve; and WS, wollastonite. Data are means ± SE (n = 4). Same letters beside the means indicate no significant difference according to Tukey honestly significant difference test (p < 0.05).