Abstract
The aim of this study was to evaluate the yield of some herb species grown in a greenhouse during the early spring period. The effect of the sowing date and the usefulness of three types of pots for growing lemon balm, marjoram, and thyme were determined. The present study was carried out during the period from 29 February to 5 May 2008. The experiment was set up as a two-factor experiment, in 20 experimental units at each level. During the harvest, the plant height and the fresh herb yield were estimated. The following contents were determined in the fresh plant herb: reducing sugars and total sugars, L-ascorbic acid, chlorophyll a + b, dry weight, while the content of essential oil was established in air-dry herb. Seed sowing on 14 March contributed to the highest fresh herb yield with the highest proportion of dry weight (thyme), reducing sugars and total sugars (marjoram and thyme). On the other hand, the plant material obtained from the earlier sowing (7 March) was the richest in chlorophyll. Delayed sowing had the greatest negative effect on essential oil content in the lemon balm herb. An increase in the amount of the medium in the pot significantly increased the fresh weight yield in the plants studied.
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