EN
The studies were based on the results of two pot experiments with oats and maize respectively. In the expriment with oats Mg was applied on the background of differentiated nitrogen rates and in the experiment with maize three magnesium rates soil or foliar applied were compared. Magnesium fertilization increased yield of fresh matter of maize and slight decreased the oats yield. It was associated with increased uptake and utilization of magnesium and narrowing of the following ratios Ca.Mg, K:Mg and K:(Ca+Mg) in tested crops.