The article presents the results of a study of the effect of Euro-Lightning, Proponit, Gezagard herbicides and the combined action of Proponit + Gezagard herbicides on weediness, yield and oil content of sunflower crops in the conditions of the mountainous zone of the Kabardino-Balkarian Republic. Research on improving the methods of cleaning from weeds with the use of modern chemical plant protection products was carried out in the conditions of the Zolsky district of the republic. In the course of the research, the species composition of weeds was studied. Eight species of weeds were found in the crops, among them the most numerous were white gauze, upturned amaranth, and ragweed. Revealed by accounting for weeds after certain periods of time, which is after the introduction of soil herbicides. the number of weeds decreased by 79 pcs/m2. The use of Euro-Lightning herbicide significantly reduced the number of weeds; its effectiveness by the harvesting period was at the level of 94%. The introduction of herbicides Proponit 3.0 l/ha and Gezagart 3.5 l/ha had an effect at the beginning of the growth and development of sunflower, and before harvesting, the effect of herbicides was no longer manifested. Accounting for the yield of sunflower revealed an increase in yield by 15.4 - 18.2 centners per hectare when using herbicides compared to the variant without herbicides. The highest on the variant Proponit + Gezagart 2.0 l/ha + 2.0 l/ha. An analysis of the oil content in sunflower seeds showed a slight difference in the experimental options. The introduction of herbicides did not affect the oil content in the direction of increase.It was found that in sunflower crops for weed control, the use of soil herbicides Proponit + Gezagart is more effective, and the insurance herbicide Euro Lightning is also effective.