Assessment Effect of Different Amount and Time of Apply Gibberellin Acid on Quantitative and Qualitative Traits of Broad Bean

Gibberellins (GAs) are essential endogenous hormones found in plants and fungi controlling plant development by regulating several physiological mechanisms.  This research was done to assess the effect of different amount and time of apply Gibberellin acid on quantitative and qualitative characteristics of Broad bean.  This research was conducted according 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 of analysis of variance revealed effects of different amount, time of apply Gibberellin acid and interaction effect of treatments on all studied traits was significant. Assess mean comparison result of interaction effect of treatments indicated maximum amount of number of pod per plant (17.34), number of seed per pod (7.48), seed weight (1320 gr), seed yield (2899 kg.ha-1), harvest index (48.50%), biologic yield (6140 kg.ha-1), leaf area index (2.61), protein content (30.00%) and nitrogen content (4.80%) was noted for 50 ppm and vegetative growth before flowering and lowest amount of mentioned traits belonged to nonuse of Gibberellin acid at pod emergence until grain filing.  Use 50 ppm Gibberellin acid at vegetative growth before flowering led to produce maximum amount of quantitative and qualitative studied traits and can proposed to farmers in studied region.