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Sirvi Autor "Vasylkovska, K." järgi

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  • Pisipilt
    Kirje
    Analysis of effective sunflower cultivation zones using the example of Ukraine
    (Estonian University of Life Sciences, 2024) Vasylkovska, K.; Andriienko, O.; Malakhovska, V.; Vasylkovskyi, O.; Andriienko, A.; Shepilova, T.
    The article provides a comparative analysis of the area of sunflower cultivation from 2000 to 2023 broken down by regions of Ukraine for two conditional periods of 2000–2010 and 2011–2021, and 2022–2023 war years. Thus, during the period under research the average area of sunflower seed cultivation increased from 2.84 million ha in 2000 to 6.66 million ha in 2021 i.e. by 2.34 times. The increase of these areas occurred due to the reduction of the area allocated for the cultivation of other crop rotations. During the first conditional period (2000–2010) Dnipropetrovsk and Zaporizhzhia regions which geographically belong to the steppe zone of Ukraine became the leaders with an area of sunflower cultivation of more than 500,000 ha (on average 469.8 and 487.8 thousand ha of sunflower). During the second conditional period (2011–2021) Dnipropetrovsk and Zaporizhzhia regions maintained their leadership (573.5 and 564.7 thousand ha). The zone of effective sunflower cultivation has expanded due to the expansion of cultivated areas in Kirovohrad region (550.6 thousand ha) which is situated on the border of the northern part of steppe and forest steppe. The occupation of a part of Ukraine pushed back Zaporizhzhia region from leading positions in sunflower cultivation while Dnipropetrovsk and Kirovohrad regions had more than 600,000 ha in 2022–2023. The further increase of cultivation areas at the expense of other crops contradicts the laws of agriculture and the zonal recommendations of scientific institutions. Therefore, an increase in the gross harvest of sunflower seeds is possible only due to the improvement and adaptation of cultivation technology, a balanced selection of sunflower hybrids better adapted to climate changes.
  • Pisipilt
    Kirje
    The impact of predecessors on yield and sunflower hybrids’ seed in the steppe of Ukraine
    (Estonian University of Life Sciences, 2026) Andriienko, A.; Andriienko, O.; Vasylkovska, K.; Semeniaka, I.
    Predecessors have a significant impact on the growth and development of the following crop. Depending on the predecessor crop there is different amount of nutrients, moisture left in the arable soil layer as well as phytosanitary conditions of fields differ. The research programme included the study of peculiarities of growth, development and yield formation of the new sunflower hybrids (LG59580, LG50609SX, PR64LE25, Suzuka), which belong to various ripeness groups, depending on predecessors in the north Steppe of Ukraine in order to improve major zonal energy-efficiency technology of sunflower cultivation. In terms of phytosanitary, cultivation of sunflower after sunflower had negative effect. During the cultivation the number of affected plants was twice fewer after other better predecessors. The Suzuka hybrid showed higher resistance. All of the hybrids formed higher productivity in case of their cultivation after winter wheat as a predecessor with 3.45–3.72 t ha-1 and after corn as their predecessor with 3.34–3.61 t ha-1. Sunflower re-seeding caused yield reduction by almost 1 t ha-1. The thousandkernel weight in all hybrids under research was higher in case of their cultivation after winter wheat as a predecessor. After winter wheat and grain corn this parameter fluctuated within the range of 71.5–74.5 and 69.3–72.5 g respectively, depending on the hybrid, while the parameter was much lower after sunflower and only reached 60 g in LG50609SX hybrids. The highest oil content in all the hybrids was measured after winter wheat and grain corn as predecessors. The highest oil content indications of 50.8–51.0% were defined in LG59580 and Suzuka hybrids. Thus, the cultivation of the hybrids under research after winter wheat and grain corn as predecessors contributed to the formation of healthy and productive plants, while growing sunflower in re-seeding conditions led to impaired phytosanitary conditions, reduced yield and decreased quality of seeds.
  • Pisipilt
    Kirje
    Productivity of winter wheat in the northern Steppe of Ukraine depending on weather conditions in the early spring period
    (2021) Mostipan, M.; Vasylkovska, K.; Andriienko, O.; Kovalov, M.; Umrykhin, N.
    The objective of the research was to develop scientific and methodological bases for adapting the technology of growing winter wheat depending on weather conditions in early spring. Winter wheat was grown at different sowing dates. It is established that the reserves of productive moisture in the soil at the time of renewal of spring vegetation are crucial for the formation of winter wheat harvest. After worse forecrop, the impact of moisture on productivity reaches 49.7–66.4%. The later the renewal of spring vegetation of winter wheat is, the lower the productivity of the crops. The shorter the period from the date of transition of the average daily air temperature above 0 °C to the beginning of active vegetation of plants is, the higher the productivity of winter wheat crops. Therefore, depending on weather conditions of early spring period and the time of renewal of spring vegetation of plants, it is necessary to adjust the technology of growing winter wheat during the spring-summer period.