Study of nitrogen rates effects and seed biopriming with PGPR on quantitative and qualitative yield of Safflower (Carthamus tinctorius L.)

In order Study of nitrogen rates effects and seed biopriming with PGPR on quantitative and qualitative yield of Safflower (Carthamus tinctorius L.), a split plot experiment based on randomized complete block design with three replications was conducted in 2011 at the Research Farm of Islamic Azad Univewrsity, Ardabili branch. Treatments were: seed biopriming with PGPR at four levels (without seed inoculation as control, seed biopriming with Azotobacter chroococcum strain 5, Azosprilium lipoferum strain OF, Pseudomonas strain 186 ) in the sub plots and nitrogen fertilizer rates as urea in four levels (zero as control, 60, 120 and 180 kg/ha) in the main plots. Means comparison showed that maximum grain yield (1940.4 kg/ha) was obtained in seed bio priming with Pseudomonas strain 186× application of 180 kg/ha and minimum of it was obtained in non application of fertilizer × seed inoculation with PGPR. Increasing of nitrogen rates up 120 kg/ha increased content oil but it decreased in application of 180 kg N/ha. Thus, it can be suggested that in order to increasing of grain yield and yield attribute, seed inoculation with Pseudomonas strain 186 should be applied in application of 180 kg /ha in conditions of Ardabil Plain.