Kornilova N. Agroecological peculiarities of phytocomplexes formation with the use of medicinal plants

The dissertation is devoted to the investigation of mutual influence of medicinal and decorative plants. The interaction between plants in the natural environment starts with seed germination. Accumulated substances in the seeds are able to inhibit or stimulate seed germination of other types and growth of roots and stems. Therefore, allelopathic impact of water-soluble substances that released during seeds germination of the 21st species of medicinal plants on the germination activity of Echinacea purpurea in order to find the most favorable combinations during the formation of stable and productive phytocomplex with the participation of Echinacea purpurea L. was studied in the dissertation. It was conducted a research concerning the influence of vegetative mass extracts of Melissa officinalis L., Salvia sclarea L., Papaver thoeas L., Artemisia absinthium L., Sorbus aucuparia L., Betula pendula L., Thuja occidentalis L., Juniperus Sabina L., Buxus sempervirens L. on seeds germination of the 21st species of medical plants. To study the accumulation of physiologically active substances in the soil under the crops of 5 species of medicinal plants it was selected samples and investigated the 21st species of medicinal plants. It has been established that the highest phytotoxic effect have aqueous extracts of creeping juniper, common box tree and drooping birch. It is found that all examined plants have an inhibitory effect on the seeds germination of Echinacea purpurea L. Extracts, obtained from medicinal plants, have preferably negative effect on seed germination of medicinal plants; it was found that good predecessors for the majority of medical species are Ocimum basilicum L., Lophanthus anisatus Benht., Hyssopus officinalis L., Melissa officinalis L. It was detected an allelopathic toxicity of soil where the following species of medicinal plants grew up: Lophanthus anisatus Benht., Salvia sclarea L., Salvia officinalis L., Echinacea purpurea L., Ocimum basilicum L.