Late autumn observed a very high content of nitrogen, the lowest for the 60-90 cm layer (4.3 mg·kg^-1). In early spring, however, the highest content of nitrate nitrogen was recorded in soil sampled from the greatest depth. The content of ammonium nitrogen for each date was highest in the soil sampled from topsoil. Undersown oleiferous radish significantly decreased N-NO₃ content (by 19%) in the second half of September, as compared with faba bean in pure stand. Over an intensive growth of winter wheat, the content of mineral nitrogen due to mineralization of ploughed radish biomass was significantly higher after self-completing faba bean with the undersown crop as compared to no-faba bean combination.

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