Winter rapeseed requires boron throughout the entire growing period. Therefore, it is recommended to fertilize it with this element foliarly several times during critical phenological phases. In autumn, during the 4-6 leaf phase, Serhiy Adamenko, head of the product development and microfertilizer services department at Ukravit, advises fertilizing winter rapeseed with an easily assimilable boron fertilizer based on organic polyborates, Vanguard Bor (boron (B) — 150, nitrogen (N) — 65 g/l) at a rate of 1.0 l/ha.