Pervachuk M. Harmfulness of weeds and measures for their control in soya crops forest-steppe of Ukraine

The structure of weed composition was investigated in agrocenoses of soya in the forest steppe zone of Ukraine. The critical period of harmfulness of weeds and optimum periods of their destruction were established. Taking into account high level of weed infestation and low competitive activity of soya plants, high-performance herbicides and their compositions were selected, for pre-emergence: trophy, 90 % c.e., reyser, 25 % c.e. and for post-emergence: galaxy top, 47,1% w.l.c., harmony, 75 %w.l.g., poast, 20 % c.e., select, 12 % c.e., shogun, 10 % c.e. application. These herbicides and their compositions have been proved to possess high selectivity to soya plants. Under condition of herbicides application, the favorable conditions for growth and development of soya were created, resulting in the increase of the yield by 0,65-1,05 tons/ha against control field. The use of the given preparations and their tank mixtures is economically and energetically expedient measure of weed control in soya crops.