The effect of biofertilizers and chemical fertilizers on the quantitative and qualitative features of three cultivars of sunflower

In order to survey the effects of biofertilizers on the quantitative and qualitative featuresof three cultivars of oil-sunflower (Helianthus annus) this study was carried out during theyears of 2007-2008 in "Khoy". The experiment was done in factorial test based on complete randomized blocks design in four replications. the cultivars of sunflower as the first factor in 3 levels included Hisun 33, Alstar and Euroflor; and the secondary factor included compound of seeds inoculation with biofertilizers and chemical fertilizers in 8 levelsincluded 50% K2SO4 + Biosulfur, 100% K2SO4 + Biosulfur, 100% K2SO4, 50%Urea +Azotobacter, 50% Urea + Nitroxin, 50% Urea + Azotobacter + Nitroxin, 100% Urea, 100% Urea + 100% K2SO4. The results of the experiment showed that the effect of cultivar and fertilizer was significant on plant height, grain yield and oil yield. The interaction effect also was significant on plant height and oil yield. The comparison between the averages of cultivars showed that Hisun 33, concerning with the qualities studied, were better than other two cultivars. So that Hisun 33 produced diameter of tray 18.8 cm, the maximum grain yield and oil yield respectively with 3832 and 1705 Kg per hectare. Among different levels of fertilizers of seeds inoculation with Biosulfur + 100% K2SO4 and 50 % Urea + Azotobacter + Nitroxin had the outmost positive effect on the increasing of, grain yield and oil yield. Ultimately, the total results of two year research seeds inoculation of sunflower withbiofertilizers accompanied by decreased use of chemical fertilizers, like nitrogen fertilizerscan have benefit on the improving features of quantitative and qualitative oil – cultivars.