Adaptability of clonal rootstockes to the conditions of the southern Irkutsk oblast

The introduction of a new crop into agricultural production should be preceded by a long-term study of its compliance with the soil and climatic conditions of the region. The use of clonal rootstocks will significantly reduce the time from cultivating rootstock to harvest, change the habitus of a fruit tree (it is easier to care for dwarf trees), improve yields by increasing the number of plants per unit area, and reduce the time of entry into fruiting due to scion-rootstock relationships. The characteristic of phenological phases is very important for understanding the adaptability of a particular culture to the climate of the region under study. We have shown that favorable climatic conditions contribute to the complete passage of the phenological phases of development by all rootstock genotypes. Laboratory experiments on the study of winter hardiness confirmed the conclusions of field tests. Most varieties of clonal rootstocks have high and medium winter hardiness in our region and appear promising for further study. The genotypes E56, Ural5 and a clone of the Siberian berry apple tree are the most valuable for selection of clonal rootstocks in the conditions of Southern Cisbaikalia.