Abstract
The productivity of sour cherry varieties and hybrids in the Republic of Tatarstan was assessed. There is a strong variability in productivity among sour cherry varieties and hybrids. A weak positive correlation was found between productivity and hydrothermal coefficient over the summer period. The share of influence on the variability of the genotype productivity, the conditions of the year and the interaction of the genotype with the conditions of the year is determined. The most productive varieties and sour cherry hybrids are distinguished. In the gardening of Tatarstan it is recommended to use varieties of cherry Zarya Tatarii, Sakharov's memory, abundant and elite forms Amorel Tenkovskaya, Gilfanovskaya and Zonal; In the selection for productivity - varieties of Zarya Tatarii, Sakharov's Memory, Abundant and promising forms 21-20, Amorel Tenkovsky.
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