Weed species composition and quantitative parameters of weed infestation of winter wheat crops in the steppe zone of Krasnodar Territory

Abstract

The characteristics of the species composition of modern agrophytocenoses of winter wheat crops in the period of mass flowering and the beginning of fruiting of weeds is given, being the basis for the formation of weediness of crops cultivated after winter wheat in the rotation in the next field season. Of the 151 species of weeds recorded in winter wheat, only 3 species were present with high abundance in all fields during all the years of study. More than half of the winter wheat fields were constantly present with high abundance of 9 species and low abundance of 12 species of weeds. A complex of 102 accompanying species has been registered with low indicator abundance, a part of agricultural phytocenoses of winter wheat crops. The formation of different species composition of agrophytocenoses, with the dominance of different species, causes different initial contamination in the fields in the subsequent cultivated winter crops after wheat. We need a differentiated approach to each field where winter wheat was grown as a precursor, based not only on the operational monitoring data carried out in the spring, but also on the monitoring data of the year preceding this.