Plant and Soil Science

The results of the research are focused on the influence of growth regulators "Vermimag" and "Vermihidis" on presowing treatment of seeds and spraying sunflower seedlings of NK Rocky hybrid on growth and development of plants and seed productivity of crops. The research was carried out during 2013-2016 on the experimental field of the branch of the Department of Plant Production, Selection and Seed Production of the Podolsky State Agrarian and Technical University at PF "Bogdan and K" in the Snyatinsky District of Ivano-Frankivsk Oblast, which is located in the western part of the Forest Steppe. Soil on the experimental site turf, podzolenaya medium soup. The seeds were seeded at a rate of 70 thousand hectares per hectare of seedlings. The total area of the plot is 70 m2 , the registration area is 50 m2 . Placement of plots systematically for a fourfold repetition. The study is carried out in accordance with existing conventional methods. It was established that the growth regulators "Vermimag" and "Vermiodis" influenced the leaf surface and the photosynthetic activity of the sunflower agrocenoses of the hybrid studied and the productivity of the culture. The highest growth rates of the leaf surface were 53.7 thousand m2 / ha, or 15.0 thousand m2 / ha more control, in the flowering phase were observed in the variant of pre-seed treatment of the hybrid seeds with the growth regulator "Vermiodis" at a dose of 4 l / and spraying of plants during the period of vegetation by the same preparation twice in 4 l / ha. In this variant, the highest accumulation of dry substances was observed - 8.5 t / ha, which is 2.1 t / ha more than on the control. The photosynthetic potential of crops was 2.820 million cubic meters / hectare, or by 0717 million cubic meters / hectare more than control. On average, over 4 years of research, it was found that on the variants of joint application of pre-seed treatment of seeds and single spraying with the growth regulator "Vermiodis", the productivity of the sunflower of the HP Rocky hybrid increased compared with the control by 9.4-12.3%, for double spraying - by 14.2-16.1 %. The highest yield (3.6 t / ha) and oil yield of 2.03 t / ha were on the variant of joint application of pre-seed treatment of seeds and two-time spraying of plants during the vegetation period with the preparation "Vermigodis" at a dose of 4 l / ha. 

sunflower, regulators of growth and development of plants, productivity, quality