Secondary plant biomolecules are the main agents in biochemical inter?actions between plants and the environment. It is possible to distinguish the role of secondary biomolecules in allelopathic (plant-plant) activity, plant-insect, plant-microbe, plant-herbivore and others. These interactions can significantly affect the productivity of agricultural crops. Application of allelochemicals into agricultural practice may reduce the use of herbicides. Effect of Salvia sclarea L. and Clinopodium menthifolium (Host) aqueous extracts on lipid peroxidation process, as well as the activity of antioxidant enzymes in leaves and roots of Jimson weed (Datura stramonium L.) and soybean (Glycine max L.) seedlings were examined 24 h, 72 h and 120 h after the treatment. The third aim was to evaluate effectiveness of aqueous extract as contact toxicant against Rhyzopertha dominica. Our results showed that S. sclarea aqueous extract induced lipid peroxidation in roots of Jimson weed seedlings 24 h after the treatment. Furthermore, both tested concentrations of C. menthifolium aqueous extract induced lipid peroxidation in Jimson weed roots 72 h and 120 h after the treatment. It was observed that S. sclarea aqueous extract showed toxic effect against R. dominica, with high mortality rate (above 95%).

Izvod Cilj rada je bio određivanje površinskog napona i suspenzibilnosti radnih tečnosti fungicida (Quadris i Dithane M-70), insekticida (Actara 25-WG i Cipkord 20-EC) i njihovih mešavina sa nepesticidnim supstancama (komleksno đubrivo-Mortonjic plus; ađuvant-Sillwet L-77), zavisno od kvaliteta vode (bunarska, česmenska ili površinska), koje se koriste u poljoprivredi (navodnjavanje i primena agrohemikalija). Sve ispitane vode su imale visok površinski napon (63,8-68,7 mJ/m²). Smanjenje istog za oko 50%, u odnosu na kontrolne vode, ostvareno je ađuvantom (Sillwet L-77) i preparatom formulisanim kao koncentrat za emulziju (Cipkord 20-EC) dodavanjem u radne tečnosti pesticida i nepesticidnih supstanci, a smanjenje za oko 2/3 je registrovano u vodi iz reke Save. Evidentno je smanjenje suspenzibilnosti upotrebom česmenske vode za razliku od ostalih voda, ali i u mešavinama koje sadrže Dithane M-70.