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biochemical mechanisms of adverse effects, and developed optimal conditions for
growth of aromatic substances; the subject of aromatic substances interacting with
other organisms was first studied; the causes of soil fatigue under aromatic plants
were determined, and elimination methods were suggested; 8) environmental
issues of allelopathy and environmental protection, i.e., the study of biological
potential of aromatic substances with high allelopathic activity; 9) general issues of
allelopathy, particularly, its history, current state and perspectives.
Scientific findings of L.D. Yurchak were arranged for the first time. They
include more than 150 works of scientific value and reflecting basic areas of the
scientist’s research work, and are still relevant for the modern science, including
her three monographs, manufacturing recommendations, two patents to inventions.
Practical value of L.D. Yurchak’s scientific achievements was determined.
Together with producers of the Zolotoniskyi Liqueur and Spirits Plant, she
developed new formulations for alcoholic drinks (Tsilushchyi balm, Shavlia
liqueur) launched in production and brining in UAH 1.5 million net income for the
country in 2001.
The sources examined evidenced L.D. Yurchak’s contribution into
preparation of high qualification specialists. Three theses were defended under her
academic supervision (including one after her death).
Organization and popularization activities of L.D. Yurchak in allelopathy
were also examined. It was established that in 1962‒2009, the scientist actively
participated in the work of more than 40 domestic and foreign symposia,
conferences, seminars.
Expedition activities of the scientist were also studied. L.D. Yurchak leaded
expeditions to state owned farms of the Crimea on multiple occasions (4 farms); of
the Zaporizhzhia, Odesa, Chernihiv, Poltava, Lviv, Khmelnytskyi, Cherkasy
regions of Ukraine; Moldova (3 farms); Russia (4 farms) that grown essential oil
crops, in order to study adverse factors of allelopathy.
Therefore, the analysis of scientific sources evidencing L.D. Yurchak’s
contribution into development of domestic allelopathic science confirms theoretic