The Effect of Biofertilizer, Azotobacter, and Different Levels of Nitrogen Application on Yield and Yield Components of Three Bread Wheat Varieties

In order to study the effects of different compounds of biofertilizer and Nitrogen on yield and yield components of three bread wheat varieties including Chamran, Pishtaz, and Bahar, an experiment was conducted at agricultural research station in Shirvanchardavol, Ilam province, 2007-2008. This experiment was arranged as split-plot in RCBD (Randomized Completely Block Design) with four replications. Chamran, Pishtaz, and Bahar cultivars were allocated to main plots and the compounds of biological and chemical fertilizers were arranged in sub-plots. The results of the studied characteristics variance analysis showed that the weight of 1000 seeds and protein content were not significantly affected by the variety, but other characteristics were significantly affected by the variety and different levels of fertilizer compounds. The results indicated that the compounds of fertilizer and Azotobacter compared to the application of the one by itself result in a higher yield. In addition, by applying Azotobacter, the amount of the applied Nitrogen would be reduced, but in the course of this experiment, high yield can only be achieved in the presence of the both. In the current research the 1000 seed weight, spike number per m2, and seed number per spike are significantly correlated with seed yield. The 25% Nitrogen and Azotobacter compound resulted in the highest yield, and the mere application of the biofertilizer resulted in the lowest yield.