Komar O. Optimization of the elements of the technology of growing parsnip in the Right-bank Forest-steppe of Ukraine

The dissertation deals with the results of research on optimization of elements and techniques of cultivation of parsnip in the conditions of Right-bank Forest-steppe of Ukraine. Morphological and physiological peculiarities of formation and realization of biological potential of productivity of varieties of parsnip depending on soil-climatic conditions and techniques of cultivation technology were investigated. It was proved that the highest yield in the conditions of the Right-bank Forest-steppe of Ukraine provided the Stymul and Pulse varieties with a total yield of 45.4 and 44.4 tons/hectare, and the commodity output of roots of 89 and 87 %, accordingly. The use of pre-sowing soaking of seeds with plant growth regulators Regoplant and Emistym C provided an increase in yields in comparison with control of 3.4 and 3.1 tons/hectare or 7.2 and 6.6 % accordingly. The optimal time to sowing is the first decade of April, which ensures the highest yield – 50.3 tons per hectare and marketability – 90 %. The high yields (49.8–53.0 tons/ha) were obtained at the stripe sowing method and to the plant placement schemes (50+20)×8 cm and for sowing in lines (70+10+10)×8 cm with plant density 357 and 417 thousand pcs/hectare accordingly. According to the results of the research, recommendations for the production of parsnips in the conditions of the Right Bank Forest-steppe of Ukraine on mediumpodzolic, roughly dusty, easy loamy soil with the usage of high-yielding varieties, effective plant growth regulators, optimal sowing terms, plant placement schemes and plant density, which enable yields at the level of 44.4–53.3 tons/hectare and marketability of roots at the level of 85–93 % with high economic figures have been developed.