[Experimental cultivation of Hypericum perforatum L. in Bratislava]. / Pokusy s pestovaním l'ubovníka bodkovaného (Hypericum perforatum L.) v Bratislave.

Experiments in small plots were performed to cultivate Hypericum perforatum L. var. angustifolium DC on light soil and at a sunny location in Bratislava. In the 1st year of vegetation the herb was not harvested. Harvests were made in the 2nd and 3rd years of vegetation and later plants died. In the course of the vegetation year it was possible to carry out three harvests on the rule. The 1st one was made just prior to blooming or at the stage of the onset of blooming, and only the blooming top parts were collected. The yield of the dry tops varied in dependence on the vegetation year, conditions of the location, age of the plants, and the date of the 1st harvest. From the two-years old plants, a whole-year yield of 8.12-14.87 kg. 10 m-2 of dry tops and from the three-years old plants, 8 kg.10 m-2, was obtained. The content of hypericin varied from 0.06 to 0.13%, and 60% ethanol extracted 21.7-27.9% of substances.

[Comparison of the quality of Melissa officinalis L. cultivar Citra with Mellissas of European origin]. / Porovnanie kvality Melissa officinalis L. cv. Citra s medovkami európskeho pôvodu.

Within two vegetation periods, melissas from 17 European regions and the inland cultivar Citra were examined. Melissas differed in height, foliage, and essential oil content. In the cultivating conditions under study, two collections were possible in one year. In both experimental years at the stage just before blooming, or at the onset of blooming, plants 60-80 cm in height prevailed in the set. The share of leaves in the tops was 35-70%. In the second repeated harvest, plants with newly formed sprouts reached a height of 15-35 cm and had the best foliage (60-95%). The essential oil content in the leaves at the stage just prior to blooming, or at the onset of blooming, ranged from 0.06 to 0.16% (V/m), and the maximal essential oil content was in the plants from the second harvest (0.09-0.45%). The cultivar Citra was characterized by medium height (75-80 cm), stable values of foliage (1st harvest 55-60%, 2nd harvest 70-80%), and essential oil content (1st harvest 0.13%, 2nd harvest 0.23-0.27%).