| S/N | Sample | Depth/Number of Sample | ||
| Stages of Sample Collection | 0 - 15 | 15 - 30 | ||
| 1 | Soil | Immediately after land clearing | 3 | 3 |
| 2 | Soil | 2 weeks after fertilizer application | 3 | 3 |
| 3 | Soil and vegetable | 2 weeks after pesticide application | 3 | 3 |
| 4 | Soil and vegetable | 4 weeks after pesticide application | 3 | 3 |