The Effect of different fertilization systems (chemical, biological and combinatory) on different characteristics of winter barley

In order to evaluate the effect of the combined system of biological and chemical inputs on different characteristics of winter barley, the three-factor factorial experiment in a randomized complete block design with three replications was conducted at Sarableh Research Station of Ilam, during the 2014-2015 growing seasons. Treatments contain the application method of biofertilizer factor that include, Soil inoculation at the depth of 4 cm in the soil and Seeds inoculation, the second factor was phosphorus (P) fertilizer as triple super phosphate include three levels of P fertilizer (0, 50 and 100 kg P ha-1), the third factor involves the use of bio-fertilizers (1. Azotobacter 2. Pseudomonas 3. Azotobacter + Pseudomonas 4. Control (no inoculation)). Mean comparison of treatments showed highly significant differences between different levels of P fertilizer. The comparison of means showed that significant differences exist between different levels of bio-fertilizers and grain yield (4206 kg ha-1) of the third level (Azotobacter + Pseudomonas) achieved a 26% increase compared to the control. The results of this study showed that the use of biofertilizers potentially reducing dependence on chemical fertilizers and decreasing potential human, animal and environmental impact. Finally, according to the survey results, it seems that seed inoculation method with biological fertilizer is more effective than terrestrial insemination.