بررسی تأثیر پیش تیمار بذر با نیترات پتاسیم بر جوانه زنی

Dryness is one of the most important stresses in “Carthamus tinctorius L” which decreases its growth and production, since influences plant from many metabolic and growth aspects. This stress reduces speed and percentage of germination and finally postpones establishment of plant. Potassium Nitrate is one of the most widely used chemicals for increasing seed germination. Probably one of the reasons for positive effect of chemical stimuli like Potassium Nitrate on germination of seeds is equilibrium in hormonal ratio in seed and reduction of growth preventing materials like Abscisic acid. Thus an experiment has done for investigating the effect of Pretreatment of Carthamus tinctorius L seeds with kno3 on their germination while they were in dryness stress state. This investigation has taken place on march 2014 (Esfand 92) in laboratory of faculty of agriculture, Zanjan university, with Factorial with 3 times repeat. The figure used for Carthamus tinctorius L was framan. Investigated factors include Pretreatment of seed with Potassium Nitrate (Kno3) in two observing levels (NT) and timar with potassium nitrate (T) and five dryness level with osmotic potential of 0, -3 bar, -6 bar , -9 bar and -12 bar. Results of variance analysis indicated that the main effect of. The effect of Seedling vigor and potential on each other on characteristics of plant weight, germination percentage and index was significant and in germination velocity factor, average germination time and germination speed was insignificant.