Klipakova Y. The productivity of winter wheat varieties under the influence of treaters and plant growth regulator in the conditions of the Southern Steppe of Ukraine

The dissertation is devoted to the substantiation of pre-sowing treatment of winter wheat varieties seeds by multicomponent fungicides and fungicideinsecticide mixture, both alone and in combination with AKM plant growth regulator on the processes of germination, growth, development, flow of oxidative processes in plant tissues and the formation of yields of winter wheat varieties with different biological features. The regularities of the process of peroxidation in seedlings and plants of winter wheat, depending on the treatment of seeds by multidirectional and multicomponent preparations, have been determined. The methods of using preparations for treatment of winter wheat seeds have been improved, which allows to obtain the best results in field germination and winter hardiness of plants, the biggest leaf surface area, the highest photosynthesis net productivity, as well as chlorophylls and carotenoids content in leaves of winter wheat, improved crop structure, the highest yield and quality of the grain in different agrometeorological conditions of the year. The highest productivity level for Antonovka and Shestopalivka varieties was noted under conditions of pre-sowing treatment by Lamardor and Gaucho mixture in combination with the anti-stress composition of AKM, which allowed to obtain average yields over the years of research at the level of 8.48 and 7.61 t/ha, respectively. At the same time Shestopalivka variety produced grain of Class 1 food grade A, which indicates high plasticity and stability of the plants of this variety in the conditions of insufficient and uneven rainfall of the Southern Steppe of Ukraine. Keywords: winter wheat, varieties, treaters, plant growth regulator, presowing treatment, oxidative process, yield, grain quality.