Özet:

This study was carried out to determine the quality characteristics of some medicinal and aromatic plants grown under conventional and organic farming conditions. In the study, Anatolian sage (Salvia fruticosa Mill.), Turkish oregano (Origanum onites L.), lavandin (Lavandula x intermedia Emeric ex Loisel.), lavander (Lavandula angustifolia Mill.), spearmint (Mentha spicata L.) and pepermint (Mentha x piperita L.) species are used as a plant material. Plants were harvested in full bloom, dried in an oven, and their essential oils were extracted by water distillation. The chemical composition of the essential oils obtained was analyzed by GC/MS. Essential oil yield in organic and conventional farming conditions varied between, 2.8-3.2% in Anatolian sage, 3.5-3.8% in Turkish oregano, 5.4-6.3% in lavandin, 3.1-3.4%, in lavander, 1.7-2.2% in spearmint and 2.1-2.4% in pepermint respectively. The main components and ratios of essential oils in samples obtained from organic and conventional farming; 1,8-cineole 40.92-44.52% in Anatolian sage, 43.84-48.47% carvacrol in Turkish oregano, linalool 32.84-34.69% in lavandin, linalyl-acetate 33.03-36.28% in lavander, carvone 53.64-59.01% in spearmint and menthone 40.86-45.32% in peppermint respectively. As a result, it was determined that the essential oil yields of all the species studied were decreased in organic farming conditions. However, no significant change occurred in the proportions of the main components in essential oils in organic and conventional farming conditions.