Melnyk O. The use of carbonic acid gas and ozone for improvement of potato seed properties under conditions of the east Forest-Steppe of Ukraine.

Object: physiological-biochemical processes in tubers when using carbonic acid gas and ozone their aftereffect on growth and development of seed potato plants. Aim: to work out potato seed growing technology elements, based on the use of carbonic acid gas and ozone which would favour the optimal forming of high productive seed material with the regard for varietal peculiarities and physiological state of tubers. Methods: field, laboratory, statistic, measuring-weighing, morfometric, visual, biochemical, drop-serological, comparative-calculated. Novelty: for the first time under soil-climatic conditions of the East Forest-Steppe of Ukraine there is studied the influence of carbonic acid gas and ozone in productive qualities of potato seed tubers; determined character of the effect of treatment by gases (CO2 and O3) on physiological-biochemical processes passage in potato tubers, which stipulate forming of elite with high potential of seed productivity; worked out methods of reduction of potato affectionby the most wide spread in the region viruses; worked out economically substantiated re-gimes of seed potato treatment by the carbonic acid gas and ozone. Results: there have been worked out elements of the technology which are recommended for using in existing for conditions of the East Forest-Steppe of Ukraine schemes of seed growing. It allows to ob-tain up to 37-65 ths tubers of the seed fraction from 1 ha additionally and to reduce intensity of degeneration processes of varieties from different groups of ripeness. Reduction of the elite cost price in this case stipulates the profitableness in-crease of its production by 14-44%, depending on the gas kind and potato variety. Introduction extent: it is introduced un-der conditions of Kharkiv region and Kharkiv province. Field of use: seed growing.