effect of biofertilizer, azocompost and nitrogen on oil yield and essential oil content of dracocephalum moldavica l.

to determine the effects of biofertilizers, nitrogen and azocompost on oil yield and essential oil content of dragonhead (dracocephalum moldavica l.), a field experiment was conducted as factorial in a randomized complete blocks design with 20 treatments and 3 replications. this study was performed at two locations during 2009-2010 on field in tarbiat modares university, and at the khoy agricultural research center. treatments were consisted of two genotypes (landrace and szk-1 cultivars), two seed inoculation (either (b1) with or without (b2) bacterial inoculation with azotobacter + azosprillum + pseudomonas) and five fertilization regimes (152 kg urea per hectare, f2: 114 kg urea per hectare + 85/3 tones azocompost per hectare, f3: 76 kg urea per hectare + 77/7 tones azocompost per hectare, f4: 38 kg urea per hectare + 55/11 tons azocompost per hectare and f5: 55/15 tons azocompost per hectare). f3 treatment had the highest geraniol and zhenya when genotypes were inoculated with bacterial in both regions and genotypes. integrated treatment with 50% urea + 50% azocompost with or without bacterial inoculation in land race population, improved performance of yield and essential oil components by reducing the amount of chemical nitrogen, which could be a substitute to chemical fertilizers.