M.A. Thesis:

The effect of time and amount of Putersin on yield and yield components of Cumin in rainfed condition

In order to investigate the effect of putrescine foliar application on yield and yield components of cumin under drought stress, a factorial experiment was conducted in Randomized Complete Block Design with three replications in Jaghat-e-Waqi city, Razavi Khorasan province. The studied factors included spraying time at three levels (spraying at vegetative, reproductive stage and vegetative + reproductive) and the amount of putrescine at four levels (0, 0.5, 1 and 1.5 mM). The results showed that the highest plant height and number of lateral branch had achieved with putrescine foliar application at vegetative time, the highest number of seeds per umbrella with foliar application at flowering time and the highest number of umbrellas per plant, grain yield, biological yield and harvest index with foliar application at vegetative stage+ Flowering. Increasing the concentration of putrescine to 1.5 mM compared to control increased 40.46% final plant height, 50.04% lateral branch number, 70.7% umbrella number per plant, 33.67% seed number per umbrella, 50.81% had grain yield, 31.48% had biological yield and 44.44% had 1000-grain weight. Most of the studied traits (except grain yield and number of lateral branches) showed no significant difference between foliar application with 1 and 1.5 mM concentration. Accordingly, two foliar application putrescine in vegetative + flowering stage with 1.5 mM concentration can be recommended to produce the highest seed yield. Key word: Biostimulant, Foliar application, medicinal plants, Putrescine,

Keywords: Key word: Biostimulant, Foliar application, medicinal plants, Putrescine,