This study aimed to investigate the effect of foliar spraying of seaweed extract as a bio-‎stimulant throughput on some quantitative and qualitative properties of tomato. The ‎experiment was carried out in factorial form within the format of complete randomized ‎block design with four replications during 2014 in a mechanized greenhouse belonging ‎to Gol Azin Maghsoud Company in Tus Industrial Estate in Mashhad. The study ‎treatments were as follows: seaweed extract in four (distilled water) levels of 1, 2, and ‎‎3 ml per 1000L (of seaweed extract under the trademark of Stimplex) and verities in ‎three levels of Hungarian Mobil, Dutch Mobil, and Super Queen. The results indicated ‎that the concentration “2 ml per 1000 L” had a significant effect on the performance, ‎antioxidant percentage, acidity, and vitamin C content of tomatoes. No significant ‎difference was evidenced in terms of the other studied traits but the differences were ‎considerably significant between the varieties‎.

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