Sirvi Autor "Olifir, Y." järgi
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Kirje The content of mobile aluminium compounds depending on the long-term use of various fertilizing and liming systems of Albic Pantostagnic Luvisol(Estonian University of Life Sciences, 2023) Olifir, Y.; Нabryel, A.; Partyka, T.; Havryshko, O.; Kozak, N.; Lykhochvor, V.Today, climate change is exacerbating the problems of efficient and environmentally friendly use of acidic soils, which are widespread in Ukraine. At the same time, the role of mobile aluminium compounds in acidity formation is also becoming increasingly important. In this regard, chemical amelioration remains a primary and very important factor in the system of resource-saving and environmentally friendly agricultural measures for the efficient and balanced use of acidic soils. Therefore, the main objective of the research is to establish scientifically sound doses of chemical ameliorant that reduce the content of mobile aluminium compounds and ensure environmental safety and high productivity of agrocenoses on Albic Pantostagnic Luvisol. The research was carried out in a long-term stationary experiment established in 1965 with different doses of mineral fertilisers, manure and lime on an Albic Stagnic Luvisol. It was found that with a prolonged application of mineral fertilisers and the use of this soil without fertilisers, the content of mobile aluminium compounds at the end of the X rotation at pHKCl 4.20 and 4.42 was 68.4 and 58.5 mg kg-1 respectively. Under the organo-mineral and mineral fertilisation systems with liming with 6.0 t ha-1 of CaCO3 calculated by hydrolytic acidity, the content of mobile aluminium compounds decreased to 7.2 and 6.7 mg kg-1 of soil respectively. Under identical fertilisation systems with a lime application by pH-buffering capacity (2.5 t ha-1 CaCO3), the content of mobile aluminium compounds is 10.8–10.0 mg kg-1 soil.Kirje Diagnosis of the functional state of transformed acid soils agroecosystems depending on long-term anthropogenic loads(2021) Olifir, Y.; Нabryel, A.; Partyka, T.; Havryshko, O.; Konyk, H.The main priority of agro-industrial production has always been and remains to provide the global population and its yearly increments with food. The issue of soil fertility improvement is still the most important task of agricultural science. The assessment of the agroecological condition of Albic Stagnic Luvisol using carbon dioxide emission, redox potential, and biotic activity was carried out, based on modern methodological approaches, such as soil quality evaluation via ecologically-related biological parameters. Carbone dioxide emission, redox, and biological processes in long-term stationary experiment depend on the degree of soil acidity reduction. Soil acidification can be minimized through chemical melioration with the combined application of different doses of mineral fertilizers and manure. It was found that carbon dioxide emission is optimal in an organo-mineral fertilizing system with application of 10 t of manure per 1 ha and N65Р68K68 with lime dose (2.5 t ha-1 ) calculated according to pH buffering capacity. It is due to oxidative and moderately oxidative conditions created. This organo-mineral fertilizing system also increases the number of aerobic bacteria and overall biological activity. The mineral fertilization and the use of Albic Stagnic Luvisol without fertilizers are accompanied by increased mineralization, growth of reductive processes, and the number of moulds. Studies have shown that it is advisable to include CO2 emission, redox potential and biological activity along with physicochemical and agrochemical soil properties to assess the influence of different anthropogenic loads on soil formation.Kirje False flax (Сamelina sativa L.) and oil flax (Linum usitatissimum L.) – an important source of deficient omega-3 fatty acids(Estonian University of Life Sciences, 2022) Lykhochvor, V.; Olifir, Y.; Panasiuk, R.; Tyrus, M.Spring false flax (Camelina sativa L.), oil flax (Linum usitatissimum L.), spring rape (Brassica napus oleifera annua Metzd.), white mustard (Sinapis alba L.), and blue mustard (Brassica juncea Czern) were studied in order to establish their yield, oil content and quality. It was found that the highest seed yield (2.82 t ha-1 ) was formed by spring rape. Yields were also high in spring false flax (2.68 t ha-1 ) and oil flax (2.34 t ha-1 ). It was found that the highest oil content was in oil flax (52.2%), blue mustard (45.8%) and false flax (45.0%). The highest oil yields were provided by spring rape, false flax and oil flax - 1.21–1.25 t ha-1 . It was found that the most physiologically valuable are oil flax and false flax, which have a high content of omega-3(ω-3) fatty acids. It is advisable to use it for therapeutic, prophylactic and dietary purposes. The cultivation of false flax and oil flax is economically feasible and provides an environmental effect due to the reduction of pesticides.Kirje Iron content and qualitative composition in a waterlogged agricultural soil under long-term agrogenic influence, Western Ukraine(Estonian University of Life Sciences, 2025) Olifir, Y.; Partyka, T.; Havryshko, O.; Konyk, H.; Panakhyd, H.; Kozak, N.; Ivaniuk, V.Iron, a typomorphic element of hydromorphic and semi-hydromorphic soils, significantly influences soil formation processes. Despite being relatively well studied, there is a lack of data on the content of its mobile compounds in Albic Pantostagnic Luvisol. Therefore, the study's main objective is to determine the amount, profile distribution, and seasonal dynamics of Fe compounds in a waterlogged agricultural soil subjected to different levels of long-term anthropogenic influence. Research conducted in a long-term stationary experiment shows that the composition of mobile forms of iron in Albic Pantostagnic Luvisol is dominated by the oxide form Fe3+. The highest Fe3+ content (160.6 mg kg-1) was found in the humus-eluvial layer of the control soil without fertilizer, while Fe2+ compounds reached 46.6 mg kg-1 at рНKCl 4.30. Long-term application of an organo-mineral fertilization system combined with liming by hydrolytic acidity reduced the content of mobile iron compounds to 128.0 mg kg-1, of which Fe2+ accounted for 12.64 mg kg-1 at рНKCl 5.45. Under an identical fertilization system with liming by pH buffering capacity, the Fe2+ content was 28.0 mg kg-1, with a total content of 118.0 mg kg-1 and рНKCl of 5.54. In the natural conditions of forest and fallow land, the highest contents of mobile iron were 231.7 and 383.1 mg kg-1 in the 0–20 cm horizon with a significant predominance of Fe3+ compounds, 210.1 and 366.3 mg kg-1, respectively.