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Research results were used to systemically analyze the development of
science on chemical interaction between plants. Several basic stages were
distinguished: origination of initial knowledge on chemical interaction between
plants (about II thousand BCE – mid-18th century); establishment of allelopathy
based on summarized theoretical and first experimental data on interaction
between agricultural plants (second half of 18th – early 19th cent.); summarized
experimental data on physical and biological effects between plants, i.e., final
establishment of allelopathy science as a separate scientific area (late 19th – early
20th cent.); improvement of allelopathy research methods and relation between
allelopathy and phytocenology, soil science, microbiology etc. (second half of 20th
cent. till now). Systemic analysis helped discovering basic allelopathy evolution
milestones in detail and conditions of its development in Ukraine in the second half
of 20th century through scientific schools, educational and scientific centers, and
separate institutions.
One of the basic tasks of the thesis was the development of L.D. Yurchak’s
stages as a scientist. Three evolution periods in her professional activities were
named, and major milestones in the scientist’s life were chronologically tracked.
Analysis of
the first period
(1955‒1960) demonstrated that the family of
L.D. Yurchak (Pylypenko, pre-marriage), and professional teaching structure of
T.H. Shevchenko Kyiv State University where the future scientist studied formed
primary basis for her scientific achievements.
Second period
(1960‒1971) in the professional path of L.D. Yurchak
coincided with the initial period of allelopathy establishment as a scientific area in
Ukraine. It was founded by the Academician А.М. Hrodzynskyi. In 1965, when he
was selected as the Director of the Central Republican Botanic Garden of the
Academy of Science of the USSR (the CRBG), the allelopathy group was also
transferred to this institution, where L.D. Yurchak started her research works of
microorganism role in interspecies relations between phytocenoses, and in 1971,
she defended her thesis for a Candidate Degree in Biology named “Physiologically
Active Substances of Green-Manure Lupin and Associated Microflora”.