The impact of soil herbicides on the yield and quality of lavender (Lavandula angustifolia Mill.) essential oil

Abstract

During the period 2014 – 2015 the herbicidal effect and the selectivity of isoxaflutole (Merlin 750 WG), oxadiargyl (Raft 400 SC), imazamox (Pulsar 40) and flumioxazine (Pledge 50 VP) were studied on lavender fields, Hemus and Jubilejna varieties. The present work focuses on the influence of low doses of the applied preparations on the yield and composition of the essential oil compared with untreated control. The results of two-year studies show that the treated variants have a higher yield on average of 0.7-1.6 kg / dka. The odoriferous ingredients range in the limits: linalyl acetate (20.0 - 38.6 %); linalool (20.6 - 46.2 %); lavandulyl acetate (1.9 - 5.9 %); 1,8 cineole (0,4 - 4,9 %) and camphor (0,2 - 0,6 %). Applying oxidiarigil results in greater changes in the composition of the Jubilejna variety, whereas the Hemus variety has the most influence by isoxaflutole.

Organic vs. Conventional Farming of Lavender: Effect on Yield, Phytochemicals and Essential Oil Composition

“…led to the conclusion that fertilization doses significantly affected the development of root length, stem and root neck thickness, as well as leaf chlorophyll concentration. The different mineral fertilizers used, types of pesticides and their relationship with volatile chemicals continue to be the subject of research [16], as well as the question of whether the type of agriculture, organo-mineral fertilization, has an effect on the amount and composition of lavender essential oil [12]. Organo-mineral fertilization with an appropriate harvest season has a noticeable effect on the chemical composition of lavender oil, especially on 1,8-cineole and phenone [17].…”