Five Romanian and eight Serbian cultivars were evaluated in the conditions of South Bulgaria for nine agronomic traits. Hierarchical Cluster Analysis (HCA) permitted to group the cultivars in two main clusters divided each one in three sub-clusters. The most distant, according to the complex of studied characters, were the cultivars Gruia and Rusiya and the closest ones Gruia and Litera, Faur and Boema, Evropa 90 and Gora. A Principal Component Analysis (PCA) allowed identifying cultivars of potential interest as parental lines for further use in winter bread wheat breeding, as Boema (short stem, high number of grains per spike), Gora (high grain lysine content) and Rusiya (high number of spikelets per spike and thousand kernel weight).
The study was conducted during the period 2013-2014. Three Turkish (Denep, Efe, Gala) and four Italian (Baldo, Creso, Roma, Puma) rice variety used in the country are explored. During the growing season it is applied the standard agrotechnics of rice cultivation in Bulgaria.The samples were evaluated on morphological, biochemical and economic qualities according to international descriptors: vegetation period, paddy yield, length of panicle, weight of a panicle, mass of 1000 grains, total number grains in panicle, empty grains, crude protein, lysine. The indicators that are characterizing the productivity of varieties vary significantly at greater extent than those with quality. There are established positive correlations between the total number of grains in a panicle of rice production (r = 0.713), the weight of a panicle (r = 0.715) and the number of empty grains (r = 0.809) and negative with crude protein contents (r = -0.700). Radiated are varieties to be included in breeding programs as sources of valuable economics signs.
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.
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