Table 1 Soil sample collection states and geographical location
No | Sampling States | No. of soil samples | Geographical zone | Latitude and Longitude |
|---|---|---|---|---|
1 | Jos | 9 | North central | 9.929973978 and 8.890041055 |
2 | Nasarawa | 9 | North central | 8.490423603 and 8.5200378 |
3 | Abuja | 9 | North central | 9.083333149 and 7.533328002 |
4 | Bauchi | 9 | Northeast | 11.68040977 and 10.19001339 |
5 | Borno | 9 | Northeast | 10.62042279 and 12.18999467 |
6 | Gombe | 9 | Northeast | 10.29044293 and 11.16995357 |
7 | Kano | 9 | Northwest | 11.99997683 and 8.5200378 |
8 | Sokoto | 9 | Northwest | 13.06001548 and 5.240031289 |
9 | Port Harcourt | 9 | South–south | 4.810002257 and 7.010000772 |
10 | Ibadan | 9 | Southwest | 7.970016092 and 3.590002806 |
11 | Lagos | 9 | Southwest | 6.443261653 and 3.391531071 |