Response of Morphological Traits of Broad Bean (Vicia faba L.) to Use Different Amount and Time of Apply Gibberellin Acid

BACKGROUND: Gibberellins (GAs) are growth hormones strongly involved in a wide variety of physiological activities. Currently, gibberellins are commercially used to enhance phenotypic characteristics, earliness, and productivity of many vegetable and ornamental crops. OBJECTIVES: The current study was conducted to evaluate the effect different amount and time of apply Gibberellin acid on morphological characteristics and crop production of Broad bean. METHODS: This research was carried out via factorial experiment based on randomized complete blocks design with three replications along 2010 year. The treatments included different concentration of Gibberellin (nonuse of Gibberellin or control, 5 ppm, 50 ppm and 250 ppm) and time of application Gibberellin (Vegetative growth before flowering, flowering until pod emergence, Pod emergence until grain filing). RESULT: According result of analysis of variance effect of different amount, time of applies Gibberellin acid and interaction effects of treatments on all studied traits were significant. Evaluation mean comparison result of interaction effect of treatments on all measured traits revealed the highest amount of plant height (91.46 cm), node number (29.35), node length (4.98 cm), stem number (13.30), pod length (17.79 cm), seed yield (2899 kg.ha-1), Stem dry weight (1693 kg.ha-1) and Leaf dry weight (958 kg.ha-1) were noted for 50 ppm and vegetative growth before flowering and lowest amount of mentioned traits belonged to nonuse of Gibberellin acid and apply Gibberellin at pod emergence until grain filing. CONCLUSION: Finally according result of current study apply 50 ppm Gibberellin acid at vegetative growth before flowering had the highest amount of studied traits and it can be advice to producers in studied region.