Table 2. Means for the chemical and physical soil properties across all sites where RVF mortalities were reported or not reported [21] during the 2009–2010 RVF outbreak (calculated using the mean values per site of the first three soil layers).
Significance was determined using the non-parametric van der Waerden test, and is given as the p-value.
| Group (RVF mortalities) | |||
|---|---|---|---|
| Variable | Reported | Not reported | p-value |
| Soluble Ca2+ (cmolc kg-1) | 0.17 | 0.49 | 0.0005 |
| Soluble Mg2+ (cmolc kg-1) | 0.17 | 0.14 | 0.9212 |
| Soluble K+ (cmolc kg-1) | 0.01 | 0.01 | 0.3013 |
| Soluble Na+ (cmolc kg-1) | 2.95 | 1.44 | 0.4845 |
| Exch. Ca2+ (cmolc kg-1) | 25.5 | 45.5 | 0.0016 |
| Exch. Mg2+ (cmolc kg-1) | 7.27 | 11.2 | 0.0231 |
| Exch. K+ (cmolc kg-1) | 1.69 | 3.01 | 0.0033 |
| Exch. Na+ (cmolc kg-1) | 2.09 | 7.65 | 0.7162 |
| CEC (cmolc kg-1) | 16.7 | 28.1 | 0.0065 |
| Organic carbon (mg kg-1) | 28825 | 26926 | 0.9909 |
| Total nitrogen (mg kg-1) | 1465 | 1478 | 0.8049 |
| Electrical resistance (Ω) | 1465 | 14778 | 0.8049 |
| pHKCl | 7.27 | 7.19 | 0.9087 |
| pHWater | 8.26 | 8.14 | 0.7173 |
| Coarse sand (%) | 3.6 | 4.98 | 0.4089 |
| Medium sand (%) | 4.71 | 7.20 | 0.0349 |
| Fine sand (%) | 21.9 | 26.3 | 0.1695 |
| Very fine sand (%) | 13.1 | 13.3 | 0.3809 |
| Coarse silt (%) | 6.65 | 6.72 | 0.7192 |
| Fine silt (%) | 14.6 | 13.4 | 0.8343 |
| Clay (%) | 33.1 | 24.0 | 0.1683 |
| Residual silt and clay (%) | 1.72 | 2.11 | 0.1725 |
Values in bold-type differ significantly at p<0.1