Table 2.
V. negundo essential oil yields (%), climatic per annum and soil types of the study sites.
| States | * Essential Oil Yield (%w/w) | Coordinate | Rainfall Range (mm) | Temp. Range (°C) | Major Soil Texture |
|---|---|---|---|---|---|
| Kwara | 0.13 ± 0.01 | 8°30 N 5°00′ E | 50.8–2413.3 | 30–35 | Ferralsols and hydromorphic tropical soil |
| Kogi | 0.03 ± 0.01 | 7°30 N 6°42′ E | 1200.0–1300.0 | 15–38 | Sandy loamy |
| Benue | 0.29 ± 0.02 | 7°20 N 8°45′ E | 100.0–200.0 | 21–37 | Sandy loamy with sandy clay in the subsoil |
| Nasarawa | 0.15 ± 0.04 | 8°32 N 8°18′ E | 100.1–308.9 | 14–38 | Sandy clay loam and clay loam to clay subsurface. |
| Plateau | 0.18 ± 0.02 | 9°10 N 9°45′ E | 1317.5–1460 | 12–22 | Deep, poorly to very poorly drained sandy clay loam surfaces over clay subsurface |
| Niger | 0.48 ± 0.10 | 10°00 N 6°00′ E | 59.9–274.2 | 14–38 | Loamy sand surface horizons over sandy clay to clay subsurface horizons |
* Values are presented as mean of triplicate determination.