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Seaweed extracts usually used in agriculture and horticulture as nutrient supplements, biostimulants, or biofertilizers to improve plant growth and yield. In this study, to explain these effects. GC-MS was used to measure the change in chemical composition of tomato plant that treated with liquid seaweed extracts (LSWE). The effect of LSWE isolated from Ulva lactuca (green algae) and Grateloupia filicina (red algae), on the chemical composition of tomato (Solanum lycopersicum) that ground under greenhouse condition. Were assessed LSWE was sprayed at concentration (1.5 %) on tomato seedlings seven times (one a week) at the end of seven weeks tomato leaves were collected from each treatment then extracted and subjected to GC-MS analysis. Our results indicate that seedlings treated with LSWE increased the percentage of terpenes in plant leaf extract compared to untreated plants that contained (17.15%), while in plants treated with Ulva lactuca and Grateloupia filicina extract it was (35.52%) and (35.87%) respectively. The terpenes content monoterpenes and sesquiterpenes. No pronounced differences were estimated in the aliphatic alcohols content between the treated and untreated plants. Moreover, treatment with Ulva lactuca extract was shown to have an effect in increasing the level of fatty acids 18% in tomato plant leaves, while there was no effect of treatment with Grateloupia filicina extract, (11%) compared with untreated plants (12%).

The Effect of Seaweed Extracts on Chemical Composition of Tomato Plant (Solanum lycopersicum)