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.