During the period 2020-2021 at the experimental field of the Institute for roses and aromatic plants - Kazanlak on meadow-cinnamon soil a field experiment was carried out in the oil-bearing rose plantation (Rosa damascena Mill.). The study was carried out on the herbicidal efficacy and selectivity of Centurion super (120g/l clethodim) and Cliofar 600 SL (600g/l clopyralid) applied in vegetation of the culture. High biological efficacy of 88-91% of clethodim has been reported against annual monocotyledon weeds and 90-92% against perennial weeds. Clopyralid has a high herbicidal effect on the annual and perennial dycotyledon weeds - 90-96%. During the study period, a higher yield of fresh blossom was obtained with the herbicides used compared to the control by 230 and 700kg/ha. With regard to the amount of essential oil obtained, it was found that the herbicides under study exceeded the control by an average of 285 and 425kg/ha. The results of the study show that in all herbicide-treated variants, visual symptoms of phytotoxicity were not observed.

Cotton fabrics have good water absorption properties, air permeability, non-toxicity, but microorganisms easily damage them. Collagen is a commonly used biomaterial that has properties such as biocompatibility, biodegradability, non-toxicity, but with poor mechanical properties. Glutaraldehyde is the main cross-linking agent for collagen and characterized by antimicrobial properties. ZnO nanoparticles exhibiting antibacterial, antifungal, anticorrosive and protective properties against UV, is widely applicable in medicine. The combination of all these components in one biocomposite with potential antimicrobial properties and healing effect can find application in medical practice. In this study, an attempt was made to improve the properties of cotton fabric by impregnating it with gelatin hydrogel cross-linked with glutaraldehyde and containing ZnO nanoparticles. Three methods of modification were applied, varying the mixing regimes of the components and the conditions. The composite materials were investigated by means of SEM, FTIR, and fluorescence analysis. The morphological analyzes of the samples modified by different methods show that the spherical particles of ZnO have changed into a flower-like structures; the particles are covered by the collagen film; and dispersed and agglomerated in certain places. FTIR analyzes prove interactions between the organic and inorganic components. This is also confirmed by the observed fluorescent properties, which are of different intensity. All these observations suggest good antibacterial properties that will be the subject of future research.

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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.