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In the years 2000-2002 a field experiment aiming comparison of production effects of direct sowing and seedlings produced in multi-cell transplanting trays of chosen medicinal plants (valerian, lemon balm, lovage, basil, thyme, sage and rue) was carried out. The ex­periment was led on silty (loess origin) soil. Transplants production in multi-cell trays resulted in growth period prolongation, which had positive effect on plant size and raw material yields from the area unit. However, an increase of essential oil content in raw material obtained from objects with direct sowing was noted. On the contrary, essential oil yields of all compared species were higher on plots with seedlings transplanting. Therefore, on silty, encrusted soil (loess type) herbs trans­plants produced in multi-cell trays should be recommended for plantation establishment.
Different methods of nettle cultivation were estimated in the experiment: vegetative prop­agation with runners planted in spring and generative propagation: autumn direct seed sowing in the field and transplant production in greenhouse (in multicell trays or plastic boxes) as well as nursery bed in the field. Seedlings were planted on 5 May. The plants were cultivated in spacing 45 x 15 cm, 45 x 25 cm and 45 x 35 cm. The best method of establishing nettle plantation was planting the seedlings produced in greenhouse: in mul­ticell trays and bare root transplants obtained in plastic boxes. The highest percentage of leaves in total yield of herb was observed in treatment with planting of seedling produced in multicell trays and with vegetative propagation by runners. Significant effect of spacing on total yield of herb and leaves was not observed.
In a 4-year field experiment the effect of plantation establishment methods (direct sow­ing in the field - control; direct sowing in the field with cover of polypropylene sheet; by seedlings from plastic house; by seedlings produced in multi-cell propagation trays) on the growth and development of marshmallow plants as well as the mucilage content in roots in the first and second year of vegetation were compared. It was found that cultivation from seedlings in the first year of vegetation contributed to increase in growth and devel­opment rate of marshmallow plants. As a consequence, higher fresh weight of the above- ground parts and roots were obtained when plants were propagated from transplants than from direct sowing in the field. The greatest height and number of stalks as well as the highest plant weight were observed on the plots with seedlings produced in multiplates. In the case of biennial plants, the method of plantation establishment slightly modified the growth and development of marshmallow. The highest mucilage content was found in roots obtained from cultivation under polypropylene sheet.
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