Ardalan Ghilavizadeh - Department of Agronomy, College of Agriculture, Takestan Branch, Islamic Azad University, Takestan, Iran
Esmaeil Hadidi Masouleh - Takestan Branch, Islamic Azad University, Takestan, Iran
Hamid Reza Zakerin - Takestan Branch, Islamic Azad University, Takestan, Iran
Seyed Ali Reza Valadabadi - Takestan Branch, Islamic Azad University, Takestan, Iran
Saeid Sayfzadeh - Takestan Branch, Islamic Azad University, Takestan, Iran
Mohsen Yousefi - Department of Agronomy, College of Agriculture, Takestan Branch, Islamic Azad University, Takestan, Iran

The present study was conducted in order to investigate the effect of salicylic acid on growth, yield and macro-elements absorption of fennel in split-plot as base on randomized complete block design (RCBD) with three replications in Tehran, Iran. Irrigation regime as main plot was undergone in ۵ levels that included: I۱: full irrigation, I۲: cut off irrigation at stem elongation stage, I۳: cut off at budding stage, I۴: cut off irrigation at ۵۰% flowering stage and I۵: cut off irrigation at grain filling stage. Foliar application of SA (۰, ۳, ۶, and ۸ mM) as sub plot was applied at stem elongation, budding and ۵۰% flowering stages. Result indicated application of SA was resulted to increase biological yield in all irrigation regimes. However, application of ۶ mM SA had the most biomass under water stress at grain filling stage. Interaction of water stress and SA demonstrated that application of ۳ mM SA had the most grain yield under full irrigation, water stress at stemming and water stress at grain filling stages, while application of ۹ mM SA had the highest grain yield under water stress at budding and ۵۰% flowering stages.

Grain yield, Macro-elements, Medicinal herb, salicylic acid, Water stress