Yaroshenko L. Ecological justification of weed control in spring barley agro-ecosystems of Forest-steppe zone of Ukraine.

The object of researches - process of transformation floristic complexes of cereal crops agro-ecosystem, influence of a weeding on productivity of spring barley. The purpose - to lead monitoring vegetation of ecotonic areas framing grain crops, to develop a method phytocenotic control of weeds over decrease in a weeding of agro-ecosystem and to improve chemical protection of crops of summer barley against weeds in Forest-steppe of Ukraine due to reduction in pesticide loading on agro-ecosystems. The methods of investigations are: observations, field experiments, a statistical method. Scientific novelty - for the first time it is established in Forest-steppe of Ukraine decrease phytodiversity on ecotonic areas around agrocenosis of grain crops owing to prompt distribution and the further domination invasive species Canadian goldenrod (Solidago canadensis L.). It is revealed high-constant species; rather steady against intrusion S. canadensis. Method phytocenotic control of number weeds at the edges of spring barley crops (eco-frame from legume-grasses mixtures), necessary the method is developed for protection of fields from invasive species. Features of seasonal dynamics segetal vegetation in crops of summer barley depending on weather conditions are investigated. Application of herbicide Granstar Pro 75 VG is advanced. Due to reduction in norm of application on 20 % (12 g/hectares) in tank mixtures in crops of summer barley of Forest-steppe of Ukraine that has allowed reduce pesticides influence by an environment. Branch - agriculture, plant ecology, protection of plants.