In order to study the effect of foliar application of seaweed extract as a bio-stimulant agent on some quantitative and qualitative traits of tomato, a factorial experiment was conducted in a randomized complete block design with four replications in 2014 and was implemented in the greenhouse mechanized Gol Azin Maghsoud company located in Toos Industrial Township of Mashhad. The treatments consisted of seaweed extract at four levels (distilled water) of 1.2 and 3 ml/L (seaweed extract with Stimplex brand) and cultivars in three levels: Hungarian Mobil, Mobil\\\\\\\'s Dutch and Super Queen. The results of the experiment showed that the concentration of 2 ml/L had a significant difference in the number of panicles, number of internodes, date of flowering and number of fruits per panicle. In this research, there were no significant differences in other studied traits, but there was a significant difference between the cultivars.

Keywords