The thesis is done for solving principal issues on the improvement of certain elements of the growing potatoes technology, increasing the productivity and quality of the obtained yielding capacity.
According to research results, it is established that the growth and development of potato plants depended on the biological properties of the variety, the nutrition background, the method of fertilizers application and the mass of seed potato tubers.
The height of the stalk forming ability of potato plants has been the highest one in the version of the main fertilizer application N90P90К120 in combination with two-fold foliar feeding by micro fertilizer Intermag-Potato in a dose of 2 l/ha and as to varieties Dyvo, Lehenda, and Oksamyt-99 was 70.7, 66.8 and 58.7 cm respectively, and the vegetative mass of one bush - 568, 577, 470 grams respectively.
The highest yielding capacity of 41.7, 49.7 and 32.8 t/ha in middle-early variety Dyvo, middle-ripening variety Lehenda and middle-late variety Oksamyt-99 has been present in the version of the local application of N90P90К120 and two-fold foliar feeding by micro fertilizer Intermag-Potato in a dose of 2.0 l/ha. The maximal increase of the yielding capacity from the factor - the nutrition background amounted for 80.5% in the variety Dyvo, 99.6 % - in the variety Lehenda, 115.8 % - in the variety Oksamyt-99.
The highest content of dry matter and starch in potato tubers of the researched varieties was recorded in 2012. The content of dry matter and starch had been decreasing by 0.1-0.2 % due to the local application of fertilizers. Starch content of tubers had been decreasing by 1.9-2.0 % due to the increase of mineral fertilizers doses. The largest content of starch was as to the seeding of the mass of 81-100 g: in the variety Dyvo -17.3, in the variety Lehenda - 14.5 and in the variety Oksamyt-99 - 14.4 %. The vitamin C content had been increasing from 21.4 to 25.2 in the variety Dyvo, from 22.9 to 28.7 - in Lehenda, from 19 to 25.0 mg% - Oksamyt-99. The sum of indispensable amino acids in potato samples, grown on the nutrition background of N90P90К120 was lower by 2.3% than in potato samples, grown on the control (without fertilizers). The content of nitrates in the variety Dyvo grew by 2.0, Lehenda - 1.6 and Oksamyt-99 - 1.7 times due to the increasing of doses of fertilizers.
The highest levels of profitability - 203 % and 132 % were established in the version of the local application with the dose of N60P60К90 with two-fold foliar feeding by complex micro fertilizer Intermag-Potato in a dose of 2.0 l/ha in middle-early potato variety Dyvo and middle-late variety Oksamyt-99 respectively; 250 % - in middle-ripening potato variety Lehenda in the variant - N90P90К120 + foliar fertilization by micro fertilizer Intermag-Potato. The highest energy efficiency coefficient was in the version of the local application of N60P60К90 + foliar fertilization by micro fertilizer Intermag-Potato - 2.08.
Key words: potato, varieties, nutrition background, method of fertilizers application, mass of seed potato tubers, yielding capacity, quality, economic efficiency.
