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The article reflects the results of many years of studying the peculiarities of the formation of the number of weeds in the agrophytocenosis of spring barley, depending on the previous culture.The general structure of weed species and their genus are estimated taking into account the features of the precursor. Species diversity has been assessed depending on the nature of the previous culture.A grouping of recorded weeds into biological groups was carried out, taking into account the type of the previous crop and the peculiarities of its cultivation technology. The general patterns of the formation of the structure of weeds are formulated taking into account typological predecessors and the dynamics of the formation of each biological group of weeds in the general structure of vegetation is evaluated.Peculiarities of the conjugate formation of weed are determined taking into account the duration of phenological phases of growth and development of spring barley, and an analysis is made of the features of increasing the total weediness of the field taking into account the competitive features of cultivated plants as precursors of spring barley.

ASSESSMENT OF THE HERBOLOGICAL SITUATION OF AGRO-PHYTOCENOSES OF SPRING BARLEY DURING THE USE OF VARIOUS PRECURSORS IN THE EXPERIMENTAL FIELD