Determining the effect of soil properties on the stability of scopoletin and its toxicity to target plants

The sorption of the allelochemical scopoletin (7-hydroxy-6-methoxycoumarin) was studied in eight agricultural soils and different model sorbents. We also determined its degradation selected related results to expression phytotoxicity soil towards two plant species, Eruca vesicaria Hordeum vulgaris. Scopoletin sorbed a greater extent acid than alkaline soils. Correlations with properties indicated that pH fine (silt/clay) fraction played primary role by Weak interactions controlled soils, whereas stronger interactions, probably mineral clay constituents, became more relevant Dissipation microbial-mediated occurred slowly As result, phytotoxic activity expressed but not soil. point influence are expected exert on natural ecosystems.