Abstract

Barley belongs to the leading grain crops. This is due to its good adaptive abilities to various climatic conditions, as well as its high nutritional and feed value. However, this crop, when developed in the field, is forced to compete with weeds, which inevitably leads to a decrease in yield. The relationship between clogging, weather and climatic conditions and crop yields has been observed. However, for the geographical region of Siberia, there are few similar works exploring this relationship. Therefore, study on the influence of weather conditions and weeds on the formation of the yield of spring barley in the southeast of Western Siberia is a prerequisite for the development of the protection of this crop from weeds. This research included the study of the species composition of weeds and hydrothermal characteristics and their influence on the formation of the yield of spring barley. The studies were carried out in the steppe zone of the Kuznetsk Basin and the Mariinsky forest-steppe of the West Siberian Plain of the Kemerovo Region (Russia) from 2014 to 2018. To characterize the dynamics of yield, sown areas and gross harvests of spring barley, data from statistical bulletins of the territorial body of the Federal State Statistics Service for the Kemerovo region were used. An increase in the yield of barley was observed. In 2018, compared to 2014, the difference was 0.19 t/ha and revealed a significant reduction in acreage and, due to this, a decrease in the gross yield of barley was noted. Thirtyfour species of weeds belonging to 16 families were recorded on the plot. The biological groups of weeds are represented by six types: ephemera, early spring, late spring, annual wintering, rhizome perennials, and root suckers. The yield of spring barley is greatly reduced by dicotyledonous biennial species of weeds from the Cabbage and Bluegrass families.