The study’s goal was to ascertain the impact of a combination of herbicidal and agronomic practices on the structure of the segetal flora, the distribution of resistant biotypes and the productivity of the cereal agrocenosis. The study employed field, weighing, morphometric, soil analysis and computational methods, with statistical analysis of the results. It was found that a comparison of the five treatments revealed varying degrees of restructuring of the weed community – ranging from the untreated control to the standard treatment, the active ingredient rotation, the herbicide + agronomic practices treatment as well as the entire solution. The overall population of species dropped from 15 in the control to 11 in the standard treatment, 9 in the active ingredient rotation treatment, 8 in the herbicide + agronomic techniques treatment, and 6 in the integrated system. The number of dominant species fell from 5 to 2, whilst weed density during the tillering stage decreased from 126.4 to 42.6 plants/m². The Shannon index decreased from 2.31 to 1.36, reflecting a change in the diversity of the floristic structure. In the multiple herbicide resistance block, the standard treatment only partially suppressed resistant biotypes; active ingredient rotation enhanced this effect, whilst the herbicide + agronomic practices treatment and the integrated system reduced their contribution to the weed biomass structure. The proportion of biotypes resistant to acetolactate synthase inhibitors decreased from 60.8% to 36.1%, whilst the post-treatment survival rate of resistant plants fell from 100% to 11.9%. The reproductive component was characterised by a reduction in seed productivity from 15.8 to 1.9 thousand seeds/m² and a decrease in the potential number of seedlings emerging from the soil seed bank from 84.6 to 24.1 per m². Against this backdrop, the crop’s yield response improved from the standard treatment to the active ingredient rotation treatment, the herbicide + agronomic practices treatment and the integrated system: biological grain yield increased from 4.08 to 6.14 t/ha, whilst yield potential realisation rose from 58.3% to 87.7%. The practical significance of the research resides in the application of its results by agronomists, farms and grain producers in cereal cultivation techniques and weed control schemes
post-treatment survival; weed community; proportion of biotypes; coenotic pressure; biological grain yield