Ivankiv M. Peculiarities of migration and accumulation of organochlorine pesticides in the system of "soil-plant" under conditions of the Western forest-steppe of Ukraine

The thesis deals with the research on regulations of migration and accumulation of organochlorine pesticides in the system "soil-plant" and justification of agrotechnical measures to reduce contamination of dark gray podzolic soil in the Western forest-steppe of Ukraine. For the first time the agroecological assessment of soil in sanitary-protected zone of agrochemical stores is made, determining pollution with long-lived organochlorine pesticides. The research defines spatial boundaries of contamination, estimates level of chemical degradation of soils. It is proved that vertical migration of organochlorine pesticides in soil profile depends on peculiarities of genetic horizons. It is determined that quantitative and qualitative characteristics of vegetation within sanitary-protected zones of pesticides stores can serve as identifying indicators of the level of soil pollution with toxicants. It is found out that vegetation group changes relating to kinds, density of stand, number of botanic families and agrobiological groups, depending on soil pollution with toxic substances. The author has developed approaches to efficient application of the measures, favoring accelerated degradation of pesticides in agrobiocoenosis. The approaches anticipate scientifically argued soil cultivation and application of mineral and organic fertilizers. The research proposes a complex of agro-technical measures, in particular organo-mineral fertilization system in combination with lime under conditions of dark grey podzolic soils pollution with organochlorine pesticides and their derivatives, which reduce their penetration in different organs of spring barley and increase grain yield.