Field experiment with winter oilseed rape cultivation was carried out in 2007-2009. The subject of this study was analysis of weed infestation of winter oilseed rape canopy and seed yield depending on the rate of soil NPK fertilization and foliar application (autumn spraying with solution): 100% and 75% NPK and urea + nickel chelate + MgSO4H2O; 100% and 75% NPK, as well as urea + Plonvit R + MgSO4H2O). The control was plots without foliar fertilization (only 100% NPK). Foliar sprayings were carried out as a single rate in autumn between 10^th and 20^th of October. The second experimental factor was seed sowing rate (2.5 kg·ha^-1 – row spacing 30 cm; 4 kg·ha^-1 – row spacing 18 cm). It was found that foliar fertilization of winter oilseed rape in the autumn period contributes to a reduction in quantitative indexes of weed infestation and an increase in seed yield. Application of foliar fertilizers allows for reduction in rates of the basic mineral fertilizers NPK by.¼ From the point of view of production it is justified to reduce the seed sowing rate (2.5 kg·ha^-1), since the weed infestation and yield of winter oilseed rape did not differ significantly from the parameters observed under conditions of larger sowing density.

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