Purpose. To substantiate the features of the classification of morphobiological and economically valuable indicators of highbush blueberry varieties of Vaccinium corymbosum L. Methods. The studies were carried out during 2012–2019. Research methods: field (visual examination of the manifestation of morphological signs of vegetative and generative organs of blueberry plants), laboratory (determination of the content of vitamin C, total sugar, pectin, carotenes, anthocyanins, flavonoids, total acidity in berries), analytical, comparative, statistical (cluster analysis). Results. Over the years of research, varieties of highbush blueberries were characterized by a stable manifestation of homogeneous morphological traits and economically valuable performance indicators. In particular, the studied varieties are classified according to ripeness groups: very early: ‘Fiolent’; early: ‘Draper’, ‘Huron’, ‘Clockwork’, ‘Cargo’, ‘Laska’; medium: ‘Blue Ribbon’, ‘Top shelf’, ‘ZF08-070’, ‘Mavka’; late: ‘Liberti’, ‘Last Call’ and very late: ‘Aurora’, ‘Overtime’. It was determined that the quantitative morphological traits of highbush blueberry varieties that influenced the formation of plant productivity include such traits as growth vigor, leaf length, leaf width, inflorescences lengthwise, bunch density, fruit size. Economically valuable indicators of suitability of highbush blueberry varieties remained stable within the ripeness group. The highest yield (19.5 t/ha) was provided by the mid-season variety ‘Mavka’ of domestic selection. The yield of berries from the bush of this variety was also high and amounted to 7 kg. The studied performance indicators were low in the variety ‘Blue Ribbon’ – 10.2 t/ha and 2.4 kg, respectively. The minimum and maximum values of the manifestation of characteristics will serve to establish the limiting boundaries of its variation in the next modeling of economically valuable indicators of highbush blueberry varieties. Conclusions. Such morphobiological characteristics of highbush blueberry varieties, as plant growth vigor, leaf length, leaf width, inflorescences lengthwise, bunch density, fruit size are closely related to plant productivity, berry yield per bush, berry weight and yield. Therefore, they can be involved in the development and improvement of the model of suitability indicators of highbush blueberries for distribution in Ukraine.

Quality of Spring Soft Wheat varieties listed in the State Register of Varieties of Ukraine for 2008, according to the grain quality indices (protein content, flour vigor, bread volume). Over 86% of Winter Wheat varieties bred by Ukrainian breeders are classified according to their quality to the strong and valuable, in contrast to 14 % of foreign varieties. This is the evidence of the Ukrainian breeding varieties ability to compete.

Purpose. To study the effect of AKM plant growth regulator on growth, development and yield formation of sunflower (Helianthus annuus L.) hybrids in hybridization plots under the conditions of the Southern Steppe zone of Ukraine. Methods. Laboratory tests, field study, statistical evaluation. Results. The results of studies devoted to determining the optimal AKM concentration for the treatment of seeds of the maternal and paternal lines, the effect of AKM on field germination, biometric parameters of sunflower plants, seed quality (F1) and yield are presented. Three hybrids of the Ukrainian selection, such as ‘Alpha’, ‘Logos’ and ‘Persei’ were studied during 2014–2016. Optimal concentration of AKM (0.0015 g/l) was defined. The vigor of seeds processed by AKM was higher than in check variety by 0.8–12.8 р.р. (♂); 0.4–10.7 p.p. (♀), laboratory germination – by 2.3–6.1 p.p. (♂); 3.5–6.2 p.p. (♀). In 2016, the sunflower plant height for all variants exceeded this parameter to be obtained for other years of the study. This could be explained by the fact that HTC in 2016 for the BBCH 00–39 period was 1.4 times higher than in 2015. In general, hybrids as the studied factor considerably influenced sunflower yield, and the share of the hybrid (factor A) influence is 33%. This should be considered when selecting hybrids for sunflower cultivation technologies in the Steppe zone of Ukraine. Conclusions. Hydrothermal conditions of the year had the maximum impact on the formation of seed quality and yield of sunflower plants of the hybrids under study, but when using AKM growth regulator for presowing seed treatment, this negative impact was reduced by an average of 23%.