Table 4.
Inhibitory effect of the EOs on root growth (cm) of Lolium rigidum, Sinapis arvensis and Trifolium campestre.
| Weeds | Doses (µL/mL) | Essential Oils | ||
|---|---|---|---|---|
| E. occidentalis | E. stricklandii | E. striaticalyx | ||
| L. rigidum | Control (water) | 5.5 ± 0.3 a | 5.5 ± 0.3 a | 5.5 ± 0.3 a |
| 0 | 5.7 ± 0.3 a | 5.7 ± 0.3 a | 5.7 ± 0.3 a | |
| 0.75 | 5.3 ± 0.3 a | 4.9 ± 0.2 a | 3.7 ± 0.2 b | |
| 1.50 | 3.2 ± 0.2 b | 3.5 ± 0.3 b | 2.2 ± 0.1 c | |
| 2.25 | 1.3 ± 0.1 c | 2.3 ± 0.3 c | 2.2 ± 0.1 c | |
| 3.00 | 0.5 ± 0.2 d | 1.4 ± 0.1 d | 0.3 ± 0.1 d | |
| S. arvensis | Control (water) | 6.9 ± 0.4 a | 6.9 ± 0.4 a | 6.9 ± 0.4 a |
| 0 | 6.8 ± 0.32 a | 6.8 ± 0.32 a | 6.8 ± 0.32 a | |
| 0.75 | 6.5 ± 0.3 a | 4.1 ± 0.1 b | 5.0 ± 0.2 b | |
| 1.50 | 4.7 ± 0.4 b | 2.3 ± 0.2 c | 2.4 ± 0.2 c | |
| 2.25 | 2.9 ± 0.2 c | 1.5 ± 0.2 d | 2 ± 0.1 c | |
| 3.00 | 0.1 ± 0.1 d | 0 ± 0 e | 0 ± 0 d | |
| T. campestre | Control (water) | 6 ± 0.2 a | 6 ± 0.2 a | 6 ± 0.2 a |
| 0 | 5.6 ± 0.3 a | 5.6 ± 0.3 a | 5.6 ± 0.3 a | |
| 0.75 | 5.1 ± 0.2 a | 4.9 ± 0.1 b | 3.7 ± 0.5 b | |
| 1.50 | 3.2 ± 0.2 b | 2.7 ± 0.3 c | 1.8 ± 0.2 c | |
| 2.25 | 2.3 ± 0.4 c | 2.5 ± 0.2 c | 1.3 ± 0.1 c | |
| 3.00 | 1.4 ± 0.1 d | 0 ± 0 d | 0 ± 0 d | |
Results are reported as the mean ± SD of three experiments. The superscripts are used to compare the dose effect for each oil and on each weed. Means followed by the same letter are not significantly different by the Student–Newman–Keuls test (p ≤ 0.05). Data are expressed in cm.