On the smonitoza of weak acid reaction, well provided with phosphorus, nitrogen and potassium with low content of boron and low to medium content of zinc, an investigation was carried out into the effect of zinc and boron (applied by fertilization) on the yield of maize grain and sugar beet root. On the basis of the results obtained, the following can be concluded: 1) Zn in the amount of 10 kg/ha of zinc sulphate in the soil with high content of accessible phosphorus increases the yield of maize grain in the fertilization variant NPK + Zn by 3.1% while in the variant NPK + Zn + B by 4.7%; 2) Boron has no effect upon the increase of maize grain yield; 3) Zn has no effect upon the increase of yield of sugar beet root; 4) Boron in the form of borax, in the amount of 15 kg/ha and the fertilization variant NPK + Zn + B increases the yield of sugar beet by 6.3%.