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The article presents data on the study of influence of planting dates, planting schemes and doses of mineral fertilizers on the formation of yield of seed and product fractions of potato varieties of Smolensk selection Zabava and Smolyanochka. he research was carried out on the basis of FSBSI FSC LK (former FSBSI Smolensk GOSHOZ) on sod-podzolic medium loamy soil. Observations of the growth and development of potato plants in the studied varieties showed that the maximum number of stems was observed with the placement scheme of 70x25 cm against the background of mineral fertilizers N60P72K90. For the Zabava variety, the optimal planting time was May, 8, for the Smolyanochka variety-May, 14. In General, the Zabava variety had a higher stem-forming ability. The maximum yield of both varieties was obtained on a mineral ground N60Р72К90. The highest yield of tubers of seed fraction was noted at 70x25cm scheme and the planting date of May, 14. The maximum yield of food potatoes in the Zabava variety was obtained when the planting date was May, 8, and in the Smolyanochka variety-May, 14. It was established that the variety Zabava, regardless of plantig time, was affected by tubers with scab and foot rot. In the Smolyanochka variety, only scab was observed from diseases.

INFLUENCE OF MINERAL FERTILIZER DOSES, TERMS AND PLANTING SCHEMES ON THE YIELD OF SEED AND FOOD POTATOES OF NEW VARIETIES ZABAVA AND SMOLYANOCHKA