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A field experiment has been conducted in the region of Dobrudja with the aim to investigate the essential oil yield and its chemical composition by four lavender varieties: Hemus, Sevtopolis, Yubileyna and Druzhba. The experiment has been arranged according to the Randomized Complete- Block Design in four replications and a plot size of 10 m2. The essential oil yields varied from 90 l ha-1 by the variety Hemus to 131 l ha-1 by the variety Sevtopolis. The major constituents of the essential oil were linalyl acetate (25.5-39.7%) and linalool (27.6- 38.9%). The content of linalyl acetate was the highest by the variety Hemus, as only by this variety the ratio between linalyl acetate and linalool is 1:0.7, which defined the essential oil as high qualitative.

With relation to the present issue about the influence of the periodic water deficit on the content and yield of the main chemical components, summarized annual data have been used including years of different characteristics, with droughts in different vegetation phenophases of soybean: very dry, averagely dry and average. The experiment was conducted at the Agricultural University of Plovdiv. The experiment was set in 4 repetitions with a size of experimental plots - 30 m 2 , and the crop plots - 10 m 2 . Criteria for watering performance was pre-watering moisture of soil at option 5-80% under-soil moisture for the layer 0-60 cm. The irrigation norm for all options was 50 mm. The irrigation norm for option 5 was 150 mm, and for options 2, 3 and 4-100 mm. Irrigation was performed gravitative along short closed furrows. After the completion of all experimental options, there were established the content and yield of the main chemical components in soybean grains - raw fat content, raw protein, raw fibres, raw ash and non-nitrogen extracted substances. Watering cancellations in the period of seed filling decrease the raw protein content. Watering cancellation in the bean formation period has a negative influence on protein content in soybean or does not influence it at all. Watering cancellation during the reproductive period decreases raw protein yield, which leads to a decrease in grain yield. Regarding raw fats, the most favourable is the water cancellation in the period of seed filling which favours growth in their content. Watering cancellation in the period of seed filling leads to a more significant decrease in lysine content. Despite the watering cancellation in a particular phase, the application of the other two waterings increases carbohydrate content in soybean grains compared to that obtained in non-watering conditions.

During the period from 2014 to 2017 year in the region of Dobrich, Bulgaria, a field experiment has been conducted with the aim to determine some agricultural characteristics of lavender varieties. The following characters have been investigated: number of flowers/plant, length of the flowering stem, number of flower clusters/plant, weight of flowers/plant (g), yield of flowers (kg ha -1 ), essential oil content %, extraction essential oil yield (kg). The experiment has been carried out according the randomized block design in four replications and plot size of 10 m 2 . Four lavender varieties have been used-Hemus, Yubileyna, Druzhba and Sevtopolis. From the performed analyzes, it was established, that the variety Druzhba distinguished from the other varieties in term of yield of fresh flowers, not only by years, but also on average for the study period, as the higher productivity of this variety is due to the higher values of the structural elements of the yield. The highest percentage of essential oil content for the three-year period with 2.1% was realized from the variety Sevtopolis, and the lowest with 1.6% from the variety Hemus.