Effect of humic substances on the quality of essential oils of medicinal plants

摘要

Environmental factors cause changes in growth of medicinal plants as well as the quantity and quality of their essential oil composition. About the plant A .sieberi as its root was exposed to humic acid, the percentage of oxygenated terpeniod from the whole essential oil became 81.39%that in comparison with blank sample, an increase of 24.29% was observed. When the root got Sapropel rather than humic acid, we observed only 21.99% increase in the percentage of composition. As the root of plant Semenovia suffruticosa received extracted humic acid, the percentage of oxygenated terpeniod increased to 5.98%. While by adding the Sapropel, the increase was only 0.48%. Comparison of the percentage of essential oil composition, after addition of humic substances to their roots, in primary stage of growth depends on Factors such as physiological structure, the kind of the growing place soil, climate and the amount of sun-shine.