Evaluation of bio- chemical fertilizers on agronomical traits and oil percentage in sunflower

In order to assessment of the effects of dual inoculation of bio-and chemical fertilizers on agronomical traits and oil percentage in sunflower، a field experimentl was carried out as factorial based on complete randomized block design with three replicates in the research station of Islamic Azad University- Arak Branch، Iran in 2011. Experimental factors were Nitroxin in two levels of with and without seed inoculation، Barvar 2 in two levels of with and without seed inoculation N and P fertilizers in four levels of control (without application of fertilizer)، 150 kg ha-1 N +75 kg ha-1 P، 100 kg ha-1 N +50 kg ha-1 P، 50 kg ha-1 N +25 kg ha-1 P. Results showed that application of 100 kg ha-1 N +50 kg ha-1 P increased grain yield and oil percentage by 11 and 2. 8% as compared with control respectively. Seed inoculation with biofertilizers increased grain yield by 18% as compared with control. Maximum of oil percentage equal 46. 38% was obtained from interaction effects 100 kg ha-1 N +50 kg ha-1 P and seed inoculation with Nitroxin. the highest grain yield equal 4599. 71 kg ha-1 was obtained from 150 kg ha-1 N +75 kg ha-1 P along with biofertilizers، that with treatment of 100 kg ha-1 N +50 kg ha-1 P and seed inoculation of Nitroxin with grain yield equal 4371. 10 kg ha-1 was not significant. In general seems that application of 100 kg ha-1 N +50 kg ha-1 P along with Nitroxin and Barvar 2 can obtain acceptable yield.