effect of biofertilizers on macro and micro nutrients uptake and essential oil content in dracocephalum moldavica l.

in order to investigation the effect of different fertilization treatments on nutrient and essential oil contents in dragonhead drug (dracocephalum moldavica l.), an experiment was conducted in the station of agricultural research in urmia on 2008. treatments (nitroxin, barvar phosphate biofertilizer, biosulfur, nitroxin+ barvar phosphate biofertilizer, barvar phosphate biofertilizer + biosulfur, nitroxin+ biosulfur, nitroxin+ barvar phosphate biofertilizer + biosulfur, chemical fertilizer, control) were arranged based on randomized complete block design with 4 replications. results indicated that uptake of nitrogen, phosphorus, potassium, iron, copper, manganese and essential oil content were affected by studied treatments significantly but uptake of zinc by plant was not affected. means comparison showed the highest values of nitrogen (3.55%), potassium (3.47%) and iron (4.56 ppm) in nitroxin treatment, phosphorus (0.26%) and copper (0.33 ppm) in barvar phosphate biofertilizer + biosulfur treatment, manganese (0.48 ppm) in chemical origin of nitrogen+phosphorus+ potassium treatment and essential oil content (0.48%) in nitroxin+ barvar phosphate biofertilizer + biosulfur treatment