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Relative allelopathic effect (RAE) on Lactuca sativa seed germination (a), L. sativa root growth (b), and Linum strictum root growth (c) according to the Pinus halepensis VOC source × substrate interaction (Table 2). Values are mean ± SE. Significant differences of RAE values between filter paper and natural soil are indicated with the respective symbols * for p < 0.05, ** for p < 0.01, *** for p < 0.001 and ns for p > 0.05. GN, green needle; NL, needle litter; SN, senescent needle
