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bases of aromatic plant agrophytocenosis formation were first developed with
regard to their allelopathic properties, and a new scientific field of agroecology
was founded, i.e., agricultural allelopathy as the basis for alternative agriculture.
The analysis of scientific findings of the scientists distinguished basic areas
of her research work, and discovered the role of L.D. Yurchak’s achievements for
the development of agriculture on the following environmental bases: 1) co-
development of the first multi-purpose method in allelopathy, i.e., biological
sampling of seed sprouting that was subsequently used by many scientists, and
independent development of the methods to determine phytotoxic properties of soil
micromycetes in plant and microbial tests; 2) complex research of green-manure
lupin and evidencing the need to regulate winter crop seeding terms in green-
manure pairs to avoid adverse effects upon emergent intermediate lupin
disintegration products; 3) identification of nematode accumulation causes in soil
fatigue processes affected by the set of allelopathic, microbiological, agro and
biochemical factors, other biotic and abiotic phenomena; 4) study of intermediate
(forage) crops and determination of intervals when allelopathically active
substances of phytotoxic and phytostimulating nature are formed from putrid
residues and associate microflora; based on her personal findings, the scientist
provided a set of useful recommendations for agriculture in agroecological area to
introduce forage crops as green manure crops; 5) on the basis of flower crops, she
studied physiological processes in plants with different allelopathic activities: crops
more active allelopathically, had more intense microbiological processes than
those in less active plants, which affected the soil condition under these plants;
6) study results of bacillus types in soil fatigue of fruit plants evidenced them to be
one of the major factors for soil toxicosis development in fruit gardens; 7) complex
study of aromatic plants on allelopathic bases developed new crop rotation of clary
sage of grain-forage-essential oil class specific in the availability of not only one,
but two or three types of aromatic plants, which is economically relevant to
increase profitability of essential oil production; research of separate links in the
interacting plant-soil-microorganism system enabled examining physical and