The Effect of Nitrogen Biofertilizers on Yield and Yield Components of Two Wheat Cultivars (Chamran and Shiroodi)

A field experiment was carried out in order to investigate the effect of several types of nitrogen biofertilizer on yield and yield components of two wheat cultivars (Chamran and Shiroudi) as split plots based on randomized complete block design with three replications in Darab city. Wheat cultivars (spring type Chamran and Shiroudi) were considered as main plots and biological fertilizers (General Nitragin (A1) – Nitragin special Cereal (A2) –Nitrokara (A3) –Nitroxin (A4) – Nitrogy (A5) – Nitrogen biofarm (A6) – 100% pure Nitrogen (A7= 400 kg ha-1 as urea) – without Nitrogen application (A8)) as subplots. The measured indices included plant height, number of spikes per square meter, number of seeds per spike, 1000 grain weight and yield per unit area. According to the results, there was a significant difference between wheat cultivars (P ≤0.05) and fertilizers (P ≤ 0.01).  The treatment A4 (nitroxin + 60% pure nitrogen from urea source) obtained the highest values for the measured indices. The A2, A1, A3, A6 and A5 treatments were arranged in the next step, respectively. A7 treatment, which was exclusively urea, was arranged in the next step. Generally, the biofertilizers applied in this study containing nitrogen fixation bacteria (NFB) from Azotobacter and Azospirilum genuse, if accompanied with nitrogen fertilizer like Urea, could be a suitable and safe alternative for supplying a part of nitrogen chemical Fertilizers.