عنوان مقاله [English]
نویسندگان [English]چکیده [English]
In order to study the interaction of nitrogen and biofertilizers on yield, grain growth of wheat and fertilizer use efficiency, a factorial experiment was conducted based on randomized complete block design by three replications in field experimental University of Mohaghegh Ardabili in 2012. Factors were as follows: nitrogen rates in four levels (0, 60, 120 and 180 kg N ha-1 from Urea source) and seed inoculation with biofertilizers in five levels containing: (seed inoculation with Azotobacter chroococcum strain 5, Azospirillum lipoferum strain OF, Psedomunas putida strains of 4 and 11, control). The results showed that there was a significant difference between nitrogen rates, biofertilizers and their interaction on yield, yield components, rate and grain filling period at P ≤0.01. Comparison of means showed that the maximum yield, yield components, rate and grain filling period belonged to application of 180 kg N ha-1 whenseed inoculated with Azotobacter. Theminimum of it was observed in control treatment. The highest nitrogen use efficiency (32.1 kg/kg) was observed in 60 kg N treatment when seed inoculated with Azotobacter and the lowest of it (19.5 kg/kg) was found in 180 kg N treatment without inoculation. Grain yield and grain filling period were affected by when seeds inoculated with Azotobacter and 180 kg N was applied.