Two-factor field experiment was conducted in 2011-2014 and it was designed with split-plot method. The objective of the research was to assess the effect of undersown white clover and common serradella into single-cultivar and three-cultivar mixture of winter rye (Secale cereale L.) on selected physical soil properties. Under normal distribution of precipitation, but in the high annual temperatures, the presence of undersown species in rye significantly affected the decrease of soil moisture and the increase in soil compaction. In the remaining years, when more optimal distribution of precipitation and temperatures was noticed, the implementation of white clover and serradella did not affect soil moisture and soil compaction was significantly lower under both undersown species. The implementation of white clover and serradella into agricultural practices of rye did not affect bulk density, although its slight increase was observed. The presence of white clover and serradella in the rye stand significantly increased total and capillary porosity in a 5-10 cm layer. The similar tendency, although statistically not proved, was observed in a 15-20 cm layer.

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