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چکیده
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To investigate the effect of organic fertilizer foliar application on morphological and phytochemical traits of dragonhead, a split plot experiment was conducted in randomized complete block design with three replications during 2016 growing season. The main plots consisted of irrigation interval at three levels (3, 6 and 9 days) and subplots consisted of foliar application of BOMBARDIER as organic fertilizer at four levels (control, 2, 4 and 6 ml/L). Foliar application of organic fertilizer had a significant effect on all studied traits (except plant height, stem diameter and essential oil percentage). Increasing irrigation interval decreased plant height, number of lateral and flowering branchs, stem diameter, dry matter yield and essential oil content and yield. Interaction between foliar application and irrigation interval was significant on number of secondary and flowering branchs, stem diameter and essential oil yield. Foliar application with 6 ml/l concentration produced the maximum amount of photosynthesis pigments in dragonhead. The application of 4 ml/l of organic fertilizer in 6 and 9 days irrigation intervals produced the maximum essential oil yield (9.1 and 6.15 kg/ha) compared to the control. 6 ml/l of organic fertilizer in 3 days irrigation interval increased essential oil yield by 50% compared to control. In Totally results showed that in all irrigation intervals, foliar application with the organic fertilizer could significantly enhance the essential oil yield compared to control in the dragonhead plant. Therefore, this treatment can be introduced as the best treatment.
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