The aim of the research is to develop and substantiate measures to improve the competitiveness of grain crops, in particular, corn, aimed at improving the environmental friendliness of production and the level of farming culture in general. In the corn crops of the forest-steppe zone of the Chechen Republic, 23 species of weeds, representatives of 18 families, were found during the monitoring of the floristic composition of the weed component. In addition, a significant number of pathogens and pests of corn were recorded. Against the background of the use of a growth regulator in pre-sowing seed treatment, there was some improvement in the phytosanitary condition of crops. The type of weed in the experiments was mixed. Corn plants, the seeds of which were not treated with a growth regulator during sowing, have less pronounced competitiveness. The yield of the mid-late hybrid corn Krasnodar 507 AMV was 12.20-4.11 t / ha. Thus, with minimal weed infestation (3 pcs/m2), the yield was 10.91 t/ha or yield losses of 1.29 t/ha (10.05%). As the number of weeds per unit of sowing area increased, the yield decreased by 2.9 times and was 4.11 t/ha, therefore, yield losses were 8.09 t/ha or 66.31%. The use of growth regulators based on humic substances for pre-sowing seed treatment made it possible to reduce yield losses. Thus, during the control, the yield was 13.00 t/ha. With minimal weed infestation (3 pcs/m2), the yield was 12.21 t/ha or yield losses were only 0.79 t/ha (6.07%). Against the background of maximum weed infestation (384 pcs/m2), the yield decreased by 2.48 times and was 5.24 t/ha. The obtained results are necessary for improving measures of weed control in the agrocenosis of grain crops, in particular, corn in the Chechen Republic. The use of plant growth regulators in corn crops allows increasing the competitiveness and productivity of grain crops and the level of agricultural culture in general.