Phytotoxic Activity and Growth Inhibitory Substances from Albizia richardiana (Voigt.) King & Prain

Albizia richardiana, a fast-growing, large deciduous tree belonging to the Fabaceae family, grows well in hot and humid areas but mainly tropics of Old World. The medicinal other uses richardiana are documented, phytotoxic effects this have not yet been investigated. We conducted study investigate activity leaves identify growth inhibitory substances for controlling weeds sustainable way. Aqueous methanol extracts greatly suppressed cress barnyard grass seedlings concentration- species-dependent manner. Two were separated using several purification steps characterized through spectral analysis as dehydrovomifoliol loliolide. Dehydrovomifoliol loliolide significantly arrested seedling concentrations 0.1 0.01 mM, respectively. extract needed 50% inhibition (I50 values) 3.16–3.01 mM 0.03–0.02 results suggest that these two allelopathic might play vital role phytotoxicity leaves.