Document Type : Research Paper


1 M.Sc. Student, Dept. of Horticulture, faculty of plant product, Gorgan University of Agricultural Sciences and Natural Resources-Iran

2 Assistant Prof., Dept. of Horticulture, plant product faculty, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran.

3 Associate Prof., Dept. of Horticulture, plant product faculty, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran.


In order to study the effects of Humic acid levels and irrigation regimes on the some morphological and biochemical characteristics of Echinacea purpurea L., a pot experiment was conducted as factorial based on randomized complete block design with three replications and four experimental units at research farm of Gorgan University of Agricultural Sciences and Natural Resources, during growing season of 2014- 15. Treatments were four levels of irrigation regimes (40, 60, 80 and 100 percent field capacity) and humic acid including four levels: (0, 250, 500 and 1000 mg/kg). The results showed that irrigation regimes had significant effect on all measured properties except root length. Humic acid increased all of the growth caractristics and morphological traits in 5% level statistically, while had significant effect on total flavonoid and increased it. Interaction effect of humic acid and irrigation regimes was significant for wet and dry weight of root and shoot, total phenol and flavonoid. Therfore, the limited irrigation had negative effect on growth and plants increased their phenol and antioxidant components to stress coping. Humic acid increased growth and yield in plants that were faced with stress.


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