T HE presented materials deal with the topical problem of rhizogenesis induction and rooting of genus paulownia plants obtained by in vitro method. According to the research results, the optimal composition of the nutrient medium for the regenerants cultivation on the stage of rhizogenesis induction has been defined, the technologically optimal age of the regenerants for the in vitro -ex vitro transition, the depth of the seedlings, the number of post-septic nipples has been established. The obtained results allow to improve the technological process at the stages of rhizogenesis induction and plants rooting during the post-septic adaptation.
One of the main requirements of the new stone fruit varieties recommended for commercial cultivation is a compact crown shape that allows for greater plant density and easier crown maintenance. The aim of the research was to establish the growth processes of the above-ground parts of cherry trees in varieties of different ripening periods. The article presents the results of studies of the features of apical and lateral growth of sweet cherry trees. Biological and varietal features of tree growth strength, growth and total length of annual shoots are determined. The dependence of tree trunk growth on apical growth force is established. According to the results of research, sweet cherry varieties are grouped according to the strength of growth: the vigorous varieties are Amazonka, Dar Mliyeva, Zoryana, Mliyivska zhovta; the semi dwarf are Aboryhenka, Alyonushka, Drohana zhovta, Mirazh; the dwarfing are Biryuza, Donetskyy uholyok, Melitopolska krapchasta, Meotida. The smallest increase in trunk diameter was found for the dwarfing variety Biryuza, and the largest – for the variety Drohana zhovta. The highest yield load per unit cross-sectional area of the trunk was recorded for the variety Donetskyy uholyok, the lowest – for Drohana zhovta. The amount of growth in the trunk diameter was inversely dependent on a load of trees with the crop and the strength of apical growth of sweet cherry trees. The features of shoot-forming ability allow characterising the shape of the crown of cherry trees: round – Donetskyy uholyok, Amazonka; high-round – varieties of Aborigenka, Dar Mliyeva, Zoryana; wide-pyramidal – Alyonushka, Drohana zhovta, Melitopolska krap-chasta; pyramidal – Mliyivska zhovta, Mirazh; low – Meotida, Biryuza. Dar Mliyeva, Zoryana, Mirazh, Melitopolska krapchasta and Drohana zhovta varieties have high shootability; the Mliyivska zhovta, Aboryhenka, Meotida, Amazonka varieties have medium shootability; Alyonushka, Biryuza, Donetskyy uholyok varieties have low shootability
The article presents the research results on the efficiency of switchgrass seeds sorting by a set of characteristics – specifc gravity and aerodynamic properties in order to reduce the biological state of seeds dormancy and germination increase signifcantly. It is experimentally proved that sequential seeds sorting in two stages by a set of features – specifc weight on the pneumatic table and aerodynamic properties on the aspiration column provided a signifcant increase in its germination energy, germination and 1000 seeds weight. Sorting of Morozko variety seeds on the pneumatic table ensured obtaining seeds with germination energy and similarity in positions 1 and 2, respectively – 16–19 % and 20–22 %, while in positions 3–5 these indicators were, respectively – 5–13 % and 9–17 %. Re-sorting of these seeds by aerodynamic properties provided an increase in germination energy and seed similarity from the position of the pneumatic table "3", respectively – by 12 and 13 %, the intermediate fraction – by 14–16 %, and waste – by 19–21 % compared to these indicators to sorting, due to the selection of the lung and with lower seed similarity. Sorting seeds by a set of characteristics provided not only an increase in its quality, but also an increase in the yield of more similar seeds. The most effective way to prepare switchgrass seeds for sowing is to sort them by a set of features – specifc weight and aerodynamic properties, which reduces the biological dormancy of seeds, signifcantly increases its germination energy, similarity, 1000 seeds weight and quality seeds. But this measure does not provide a complete solution to reduce the biological state of dormancy of seeds. Key words: seeds yield, aerodynamic properties, specifc gravity, germination energy, similarity, 1000 seeds weight.
The nature of subjective positioning on the role of crop rotations in agriculture from many points of view, namely – agrochemical, biological, geological and energetic. This leads to the belief that crop rotation arose as a need for reasonable human interaction with nature, a careful attitude to it. However, a comprehensive ecological and biosphere approach to understanding the essence of crop rotation requires the resolution of certain contradictions that arise in the implementation of modern farming systems. Based on the data of long-term feld experiments, the main indicators of the biological cycle of humus carbon in black soil are calculated. The calculation is based on the balance of humus as the difference between the fnal and initial content and reserves in the soil under different crop rotations. We found that the joint application of organic and mineral fertilizers had a positive effect on the balance of humus and nitrogen in the soil and, ultimately, on crop yields and crop rotation productivity. Against this background, a positive balance of humus (+1.29 t/ha) and total nitrogen (+80 kg/ha) in the soil is observed. Strengthening the organic fertilizer system by using, in addition to manure, by-products of crops – cereal straw, peas, corn stalks contributed to the formation of a positive balance of humus and nitrogen in the soil: the annual accumulation of humus was 0.28 t/ha, nitrogen 14 kg/ha. Due to the humifcation of crop residues of cereals, peas and perennial legumes during the 7-year study period in the soil of control crop rotation 1 formed humus 2.85 t/ha, in crop rotation 14 with grasses – 7.0, the rest of crop rotations – from 3.4 up to 4.0 t/ha. In general, 5.5 % of the initial stock of humus or 8.9 t/ha was mineralized in the crop rotation without fertilizers during the specifed period. If we add to this about 3 t/ha of humus, the decomposition of which in the process of mineralization was compensated by plant residues, then during this period decomposed about 12 t/ha of humus. This value of mineralization characterizes the parameters of the biological cycle of humus in the control crop rotation. Key words: soil, fertilizers, crop rotations, crop yield, crop rotation productivity, plant residues, humifcation, humus, humus mineralization, humus balance.
А. А. PavlichenkoAssistant, Bila Tserkva National Agrarian University (Bila Tserkva), Ukraine E-mail: pavlichenkoaa@ukr.net CHANGE OF WEED-INFESTED ROTATION SYSTEMS FOR VARIOUS BASIC SOIL TILLAGE AND FERTILIZING Abstract. The article is devoted to the establishment of an optimal soil cultivation system to control the number of weed plants and to determine the potential for perturbation of arable land. The research has established that for all soil cultivations, there is a decrease in the potential
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