Misievych O. Production of high-quality conditioned seeds of annual sweet clover depending on agronomic measures in the south of Ukraine

Object of study – processes of formation of high-quality conditioned seeds of white annual clover in the conditions of the South of Ukraine. Aim – generalization of theoretical provisions and substantiation of practical recommendations on the peculiarities of productivity and yield formation of conditioned seeds of white annual clover Pivdenny variety depending on the biological potential of the studied genotype, sowing dates, sowing rates using herbicides Treflan 480 and Pulsar 40 in different conditions of their introduction in Ukraine. Methods – system approach (to determine the peculiarities of the development of white annual clover varieties depending on sowing dates and seeding rates); field and laboratory (to determine the influence of the studied factors on the biometric parameters of plants, the formation of aboveground mass and leaf surface area, their productivity); settlement and comparative (to assess the economic efficiency of growing this crop); statistical (to substantiate the reliability of the results of research and to establish a relationship between the studied factors). Results – scientific and methodical recommendations It is established that in order to increase seed productivity and obtain conditioned seeds of white annual cucumber variety Pivdenny 840–876 kg / ha with a reproduction rate of 168–175 on dark chestnut soils in the conditions of the Southern Steppe of Ukraine it is necessary to sow seeds in the first decade of April at sowing rates 2 , 5 million pcs / ha. Before sowing, carry out chemical treatment of the soil with pre-emergence herbicide Treflan 480 using the application rate of 3.0 l / ha, or apply in crops post-emergence herbicide Pulsar 40 using 1.0 l / ha in phase (cereal 1-3 leaves and dicotyledonous weeds 2–4 leaves). Chemical protection of white annual clover crops should be carried out once during the growing season. Novelty – for the first time in the south of Ukraine the generalization of theoretical positions and substantiation of practical recommendations for establishing the peculiarities of growth and development of a new variety of white annual clover Pivdenny and its seed productivity at different sowing dates, seeding rates and herbicides Treflan 480 and Pulsar 40 at different rates. The scientific value – theoretical and practical results of scientific research provided an opportunity to develop scientific and practical recommendations on the technology of growing white annual clover for seed in the South of Ukraine. Sector – agriculture.