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This work aimed to evaluate the production of fresh and dry mass of leaves, stems and aerial parts, and the contentand quality of lemon mint (Mentha x piperita var. citrata) essential oil as a result of four potassium (K)concentrations (276, 414, 552 and 690 mg.L-1) under hydroponic solutions. The experiment was carried out in thehydroponic NFT (Nutrient Film Technique) system. Leaves were separated and weighted to determine the freshmass and part of them was used to extract oil in a Clevenger apparatus. The analysis of the oil chemicalcomposition was performed in a gas chromatograph fitted with a mass spectrometer. The estimated concentrationfor the maximum fresh mass production of the leaves corresponded to 384 mg.L-1 K. The greatest K concentrationproportionated an increase in essential oil content and yield per plant, but decreased linalool and linalyl acetate inthe oil. Under the conditions the experiment was carried out, in order to obtain an adequate quantity of leaves for ahigher essential oil yield per plant and linalool and linalyl acetate accumulus, the K concentration of 414 mg.L-1 isrecommended in the hydroponic solution for the cultivation of lemon mint.Key-words: Mint, Lamiaceae, hydroponic cultivation, linalool, linalyl acetate, medicinal plant.

journal of biotechnology and biodiversity

Production and chemical composition of Mentha x piperita var. citrata (Ehrh.) Briq. essential oil regarding to different potassium concentrations in the hydroponic solution