Konovalova V. Seed productivity of oilseed flax varieties depending on moisture and fertilizer conditions in the south of Ukraine

Object of study – varieties of oil flax, doses of mineral fertilizers, soil moisture conditions, yield of conditioned seeds, its sowing qualities, economic efficiency. Aim – to determine the patterns of formation of the crop of conditioned seeds of new varieties of oilseed flax under different conditions of moisture and mineral nutrition in the south of Ukraine. Methods – field – to monitor the growth and development of plants; visual – to detect phenological changes of plants; measuring and weight - to determine the biometric parameters of growth and development of oil flax plants (establishment of photosynthetic activity of plants: leaf surface area, dynamics of accumulation of dry mass of plants, net productivity of photosynthesis, setting parameters of crop structure, yield); laboratory – to determine the quality of seed material; mathematical and statistical – for analysis of variance and statistical data processing to assess the reliability of the research results; calculation and comparison – to assess the economic efficiency of the elements of technology for growing oilseed flax. Results – it is established that to obtain high-quality conditioned seeds in the south of Ukraine it is necessary to sow on irrigated seeds of Eureka flax variety on the background of fertilizer dose N90 P60, which provides a yield of 2.36 t/ha, profit 18.20 thousand UAH/ha , in non-irrigated conditions, Vira variety with application of N60 P60, which provides a yield of 1.47 t/ha, a conditionally net profit of 9.72 thousand UAH/ha and a profitability of 140%. Novelty – for the first time scientifically substantiated regularities of formation of seed productivity of oil flax varieties depending on optimization of mineral nutrition under different conditions of soil moisture. The elements of the technology of growing new varieties of oilseed flax under different humidification conditions have been improved, which has provided opportunities to increase the yield, yield of conditioned seeds and increase the reproduction rate of quality seed adapted to the conditions of southern Ukraine. Scientific value – the best varieties of oilseed flax and economically feasible fertilizer system for different growing conditions, which will provide high yields, yield of conditioned seeds and high reproduction rate of promising varieties in the south of Ukraine. Developed a patent for a utility model. Sector – agriculture.