Table 2.
Results of three‐way ANOVAs testing for the effects of Pinus halepensis VOC source (green needle, senescent needle, needle litter, and root), dose (low vs. high), substrate type (filter paper vs. natural soil), and their interactions on the relative allelopathic effect (RAE) on seed germination rate and root growth of the two target species (Lactuca sativa and Linum strictum)
| RAE on germination rate | RAE on root growth | |||||||
|---|---|---|---|---|---|---|---|---|
| df | % SS | F‐value | p‐value | df | % SS | F‐value | p‐value | |
| Lactuca sativa | ||||||||
| VOC source (V) | 3 | 36.7 | 16.8 | *** | 3 | 2.9 | 10.9 | *** |
| Dose (D) | 1 | 10.5 | 14.4 | *** | 1 | 12.7 | 143.4 | *** |
| Substrate (S) | 1 | 1.7 | 2.3 | 1 | 0.6 | 6.2 | * | |
| V × D | 3 | 0.6 | 0.3 | 3 | 1.6 | 6.0 | *** | |
| V × S | 3 | 11.6 | 5.3 | ** | 3 | 11.2 | 42.0 | *** |
| D × S | 1 | 2.6 | 3.6 | 1 | 0.8 | 9.5 | ** | |
| V × D × S | 3 | 1.3 | 0.6 | 3 | 1.5 | 5.6 | *** | |
| Residuals | 48 | 35.0 | 0.6 | 1,282 | 68.7 | 5.6 | *** | |
| Linum strictum | ||||||||
| VOC source (V) | 3 | 42.3 | 26.1 | *** | 3 | 31.7 | 75.4 | *** |
| Dose (D) | 1 | 7.1 | 13.2 | *** | 1 | 7.7 | 53.0 | *** |
| Substrate (S) | 1 | 19.7 | 36.4 | *** | 1 | 3.6 | 24.5 | *** |
| V × D | 3 | 0.8 | 0.5 | 3 | 2.7 | 6.2 | *** | |
| V × S | 3 | 3.1 | 1.9 | 3 | 5.2 | 11.8 | *** | |
| D × S | 1 | 0.4 | 0.8 | 1 | 0.0 | 0.0 | ||
| V × D × S | 3 | 0.6 | 0.4 | 3 | 0.6 | 1.3 | ||
| Residuals | 48 | 25.9 | 332 | 48.5 | ||||
F‐values and associated p‐values (* for p < 0.05, ** for p < 0.01 and *** for p < 0.001) are indicated.
Abbreviations: df, degrees of freedom; % SS, percentage of sums of squares.