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The purpose of the research was to determine the possibility of using reduced doses of mineral fertilizers by changing the method of application and their joint use with plant growth regulators when cultivating potatoes of the summer planting period. Three varieties were studied, such as the earlymaturing variety Tiras, the medium-early variety Zabava, and the mediummaturing variety Slavyanka. Three nutrition sources were used for the study, such as without fertilizers (control), N90P90K90 randomly and N45P45K45 locally in the 0-12 cm soil layer. In addition to mineral fertilizers, the scheme of the experiment included variants with treatment of plants in the budding phase with growth regulators «Diazophyte», «Adaptophyte» and «Agrostimulin». Field experiments were carried out during 2016-2018 yrs in the Educational, Scientific and Practical Center of the Mykolaiv NAU on the heavy loam residual-slightly saline Southern Chernozem. The arable soil layer contained on average 3.1% humus (by the Tyurin method), it contained 62 mg/kg of lightly hydrolyzed nitrogen, and it contained 25 mg/kg of nitrates (by Grandville–Lagou), it contained 38 mg/kg of mobile phosphorus (by Machigin), and it contained 340 mg/kg of exchangeable potassium (using a flame photometer), and the pH was of 6.9. Weather conditions in the years of research were somewhat different, but in general they were typical for the Southern Steppe of Ukraine. The average daily air temperature in the research area was 11.0 °C, relative humidity was 73 %, annual precipitation was 472 mm, SCC was 0.5 up to 0.7. Potatoes are the second bread for the population of Ukraine. Its tubers are eaten all year round. This crop is one of the most productive, the yield of tubers can reach 100 t/ha or higher. In terms of gross potato production in the

POTATO PRODUCTIVITY UNDER DRIP IRRIGATION DEPENDING ON NUTRITION OPTIMIZATION IN THE SOUTH OF UKRAINE