The paper presents the results of plor experimenrs on susceptibility of 4 culrivars of fiber flax: Alba, Bel inka, Nike and Wiko ro broad-leaved weed herbicides (chlorsulfuron, benrazon + MCPA) and graminicides (haloksylop-R, chizalofop P, and seroxidim), used as single or mixtures, The experiments were conducted on rwo soil suitability complexes in the years 1994--1996. The culrivars Alba and Wiko were more susceptible ro herbicides than Nike and Belinka. More susceptible Alba and Wiko showed faster phenological developmenr as compared to two other cultivars, especially in the first period of growing season (from germination ro the stage of fast growth). Herbicides had more phytotoxic effeet on flax planes on light soil than on other ones. The most phytotoxic effect on res red cultivars, leading ro a reduction of scurched fiber yield, was observed for the mixture of haloksylop-R + chlorsulfuron and benrazon + MCPA followed by setoxidim ar 7-day inrerval. Higher yields of most flax cultivars were observed when flax was sprayed with chlorsulfuron herbicides followed by one of the reseed graminicides (haloksylop-R, chizalofop P or setoxidim) after seven days from application of chlorsulfuron. The cultivar Nike has been found to be the most resistant to reseed herbicides. Application of chemical methods of weed conrrol for cultivation of this cultivar resuited in an increase of long yield of scurched fiber. The herbicides reseed in the experiment usually had a beneficial effect on the quality of flax scurched fiber, especially in case of Alba and Wiko culrivars.

Ultrasonic emulsifying processes of immiscible liquids can be used to obtain stable emulsions. The authors used an ultrasonic sandwich head with an energy concentrator to obtain a suitable value of the energy density necessary for the emerge of ultrasonic cavitation. Two piezoelectric ring (Dext = 50 mm) transducers of Pz-26 type produced by FERROPERM were used to design the ultrasonic sandwich head. The frequency of the ultrasonic wave was 18.4 kHz and the excitation time of the ultrasonic transducer exiting 5 minutes. Visible bubbles during the generation of ultrasonic waves appeared in the mixture after exceeding the cavitation threshold. The authors determined also the cavitation threshold by measuring the electrical voltage conducted to the transducers. To receive long-lasting emulsion, the electrical voltage attained 300 Vpeak. The dispersion dependence on the emulsifying time was determined. The emulsion of linseed oil and water was stable through some months without surfactants.