Vuhovanets V. The harmfulness of weed and the ways of protection the brassica napus oleifera crops in the conditions of the Precarpathian region of Ukarine

The thesis is based on the results of the three year research work devoted to studies of weeds harmfulness to the brassica napus oleifera crops in the period of vegetation and the basic evaluating criteria of biological efficiency of new soil and after sprout herbicides with different spectrum of action. The herbacritical period of competitive relations between brassica napus oleifera crops and weeds is established. The coo relational interdependence between the main weather elements of the territory and brassica napus oleifera seeds productivity, between the amount of weeds in crops and the brassica napus oleifera productivity. The influence of weeds on growth, development, productivity and quality of brassica napus oleifera is also studied. Taking into account the results of the research the ways of protection brassica napus oleifera crops from weeds are proposed. It is necessary to start the crop protection in the first period of growth and development, and also in spring after the beginning of vegetation. In the fields with the high amount of weeds it is necessary to use butizan (2l/h) before sowing and 0,3 l/h of galera in spring.