Document Type : Research Paper
Authors
1 Department of Agriculture, Payamenoor University, Po. Box 3697-19395, Tehran, Iran
2 instructor, Department of Agriculture and Environment, Payam Noor University, Tehran, Iran
Abstract
In order to investigate the effects of foliar application of humic acid fertilization and mycorrhizal fungi symbiosis on quantitative and qualitative characteristics of Thymus vulgaris L., a factorial layout has been conducted, based on a randomized complete block design with three replications at the field of the research farm of Azad University, Takestan Branch during 2020-2021 and 2021-2022 years. Experimental factors included three species of mycorrhiza fungi (control, Glomus mosseae, G.etunicatum and G.intradices) and humic acid fertilizer levels included (control, 150 and 300 mg.lit-1). The results showed that the Interaction effect of humic acid and mycorrhiza on the percentage and yield of essential oil and yield was significant. The highest yield of essential oil was obtained from the treatment of 150 mg of humic acid and the application of mycorrhiza G. mosseae, which showed a difference and increase of 154% with the control. Also, the highest amounts of p-cymene and -terpinene which are the most important essential oil compounds in thyme, were obtained from the treatment of 300 mg of humic acid, which showed an increase of 23 and 11%, respectively, compared to the control. The highest amounts of p-cymene and -terpinene were obtained from the treatment of mycorrhiza G.mosseae, which showed an increase of 21 and 26%, respectively, compared to the control. With the obtained results, it can be said that by providing suitable growth conditions for thyme medicinal plant using humic acid and mycorrhizal, it is possible to influence their performance and reduce the use of chemical fertilizers.
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