Nesterchuk V. Performance sunflower hybrids based on stand density and plant micronutrients in South of Ukraine

The object of research is the technological process of cultivating sunflower seeds in southern Ukraine depending on the hybrid composition, plant density and micronutrient fertilization Ristkontsentrat, Vuksal and Master in rearing. The purpose of the research is to study the productivity of sunflower hybrids, depending on the density of plant standing and microfertilizers in growing conditions in the conditions of the Southern Steppe of Ukraine. Research methods - field and laboratory: visual, measuring and weighing for observing the phases of development, establishing biometric indices of sunflower plants and their productivity, forming a photosynthetic apparatus; biochemical; statistical; computational and comparative. Research results - For the theory: For the first time, for conditions of southern Ukraine on dark chestnut medium sosil ground, processes of formation of productivity of sunflower plants, depending on the hybrid composition, plant density and application of microfertilizers, have been investigated. For practice: Based on the results of the research, scientifically grounded recommendations on sunflower cultivation technology on non-irrigated lands of the Southern Steppe of Ukraine were proposed. It is recommended to grow the production of the hybrid Megasan, which is capable of producing yields in the range of 2.5-3.0 t / ha for maximum economic and energy indices. It is proved that the plant density should be adjusted depending on the genetic potential of the hybrids - for the hybrids Megasan and Yason, the optimum standing density is 50 thousand / ha, and for the hybrid Darius - 40 thousand / ha. The processing of sunflower crops by microfertilizers provides a yield increase of 10-19%. Sphere of use - agricultural enterprises of the south of Ukraine.