Table 1.
Properties of the investigated soils before and after 90 days treatment with various supplementations of Si. n = 5, ± SE. * indicates significant difference p < 0.05 from the untreated soil.
| Soil Type | Si-Treatment | pH | Conductivity | CEC | Org. Content | Clay | Sand |
|---|---|---|---|---|---|---|---|
| kg ha−1 | ms | mmol/gDW | % | % | % | ||
| Clayey | 0 | 6.52 ± 0.04 | 12.7 ± 0.4 | 0.12 ± 0.01 | 6.07 ± 0.29 | 17.9 ± 1.2 | 41.3 ± 2.4 |
| 80 | 6.52 ± 0.01 | 12.1 ± 0.6 | 0.12 ± 0.00 | 5.62 ± 0.33 | 19.4 ± 1.6 | 41.0 ± 2.0 | |
| 1000 | 6.95 ± 0.05* | 11.9 ± 0.7 | 0.13 ± 0.01 | 5.91 ± 0.23 | 17.3 ± 1.5 | 40.9 ± 1.7 | |
| Sandy | 0 | 7.12 ± 0.02 | 6.4 ± 0.6 | 0.08 ± 0.00 | 4.78 ± 0.43 | 0.2 ± 0.0 | 65.4 ± 4.1 |
| 80 | 7.20 ± 0.02 | 6.0 ± 0.2 | 0.08 ± 0.01 | 5.30 ± 0.36 | 0.2 ± 0.0 | 66.3 ± 4.7 | |
| 1000 | 7.41 ± 0.01* | 6.0 ± 0.4 | 0.09 ± 0.01 | 4.88 ± 0.13 | 0.2 ± 0.0 | 66.0 ± 4.0 | |
| Alum shale | 0 | 7.64 ± 0.03 | 18.8 ± 1.4 | 0.21 ± 0.00 | 10.28 ± 0.42 | 4.1 ± 0.2 | 50.4 ± 2.2 |
| 80 | 7.62 ± 0.07 | 16.9 ± 1.3 | 0.21 ± 0.48 | 9.64 ± 0.81 | 3.9 ± 0.1 | 51.4 ± 2.8 | |
| 1000 | 7.93 ± 0.06 * | 18.1 ± 0.7 | 0.21 ± 0.02 | 10.36 ± 0.03 | 4.1 ± 0.1 | 51.4 ± 3.1 | |
| Submerged | 0 | 6.84 ± 0.04 | 17.5 ± 1.5 | 0.17 ± 0.00 | 6.53 ± 0.49 | 3.2 ± 0.3 | 55.1 ± 4.0 |
| 80 | 6.80 ± 0.05 | 16.8 ± 0.1 | 0.16 ± 0.00 | 5.81 ± 0.44 | 3.3 ± 0.2 | 54.9 ± 4.6 | |
| 1000 | 7.31 ± 0.04 * | 18.0 ± 1.3 | 0.17 ± 0.79 | 5.81 ± 0.31 | 2.8 ± 0.1 | 55.6 ± 4.6 |