Effective Utilization of Agricultural Wastes from Olive (Olea Europaea L.) and Fig (Ficuscarical.) for Sustainable Environment
The rapid increase in the world’s population has engendered into an exponential increase in food demandwhich has, in turn, led to the production of large amounts of agricultural wastes. Whereas, this huge amountisobviously discarded and considered as environmentally hazardous material because of their high phytotoxicity against aquatic life and soil micro-organisms.Thus, several countries across the globe are reaching out to tackle the issue of agro-waste management through several methodsin order to be reused in industry or agriculture.Considering these aspects, the current study was conducted to gain insights into the specific effect of the discardedbiomass from olive and fig trees through testing theiraqueous and methanolleaves extracts on germination and seedling growth of weeds species. The results stated that all tested extracts displayed significant inhibitory effect, and the degree of phytotoxicity was appeared to be dependent on the concentration and target species. It was noted that the olive leaf aqueous extracts induced the highest phytotoxic effect on germination and seedling growth of target species with an inhibitionof100%,at the highest concentration,compared to the fig leafaqueous extracts (67.6%).However, the inhibitory effect caused by fig leaf methanol extract (90%) was found to be more toxic rather than the olive leaf methanol extract (55%). On the other side, the DPPHradical scavenging assay confirms that the olive leaf methanol extract possesses the highest antioxidant activitiy (EC50=145.2 µg/mL) compared to fig leaf methanol extract (EC50=160 µg/mL). Therefore, the potential effect of the fig and olive leaves extracts could be attributed to the variability of the polyphenolic amounts.In addition, negative correlation was depicted between the biological activities and the phenolic amounts, but a positive correlation was noted between the phytotoxic and antioxidant activities.Thus, the tested agri-horticultural wastes represent an inexpensive potential of naturalproducts which can be used to manage the weed growth and may help in achieving global food security sustainably.
Keywords - Olea Europaea, Ficuscarica, radical Scavenging Assay, Weeds, Agri-Horticultural Wastes.