Also we observed that high application of phosphorus fertilizer (300 kg ha1) had negative effects on yield of chamomile which this plant growth disorder is maybe because of interaction between P and Zn. In general, the results suggest that irrigation based on 50% of field capacity with application of 150 kg phosphorus fertilizer ha1 and 30 kg zinc fertilizer ha1 can improve essential oil yield and medicine components of German chamomile essential oil.