4. Conclusions
Roseroot fertilization with leonardite was the factor that affected
yielding and quality parameters of plants as well as increase in activity
of all studied enzymes catalyzing the transformation of the most important
processes of soil organic matter. It was especially effective on sandy
soil. In general, plants fromloess soil were better developed and produced higher yields of roots and above ground parts of plants. Thus, loess soil
was characterized by higher enzymatic activity than the sandy one. Better
plant growth and higher underground part yields of roseroot were also
observed in the objects with autumn seed sowing. However, our examination
of active substances showed that phenylpropanoid content varied
alongwith plant age (increasing in older plants) aswell as soil type (being
higher on sandy soil) and plantation establishment method (higher in the
case of spring seed sowing).