STUDYING BIOLOGICAL FEATURES OF GROWTH AND DEVELOPMENTOF THEINTRODUCED WINTERAPPLE CULTIVARS IN ORDER TO REPLENISH APPLE GENE POOL
- The authors:
- Zagirov N. G.
- Page numbers:
- 25 - 33
- apple tree culture, introduced cultivars, climate change, air temperature, tree height, crown diameter, stem circumference.
The aim of the research is to study the biometric indicators of trees and identify the most promising apple cultivars for replenishing the gene pool in the conditions of the southern lowland subzone in Dagestan. New information on the biology of flowering was obtained, the parameters of tree crowns and the growth activity of the introduced winter apple cultivars were determined. The height of trees tends to increase, so in the control cultivar ‘Renet Simirenko’ it was – 3.5 m in 2017, while in 2018 it made up 3.7 m, in 2019 – 4.1 m, and in 2020 – 4.3 m, on the rootstock M4. ‘Zimniy shafran’ cultivar took the middle position in terms of tree height, the lower one was observed in the ‘Starkrimson’ cultivar (3.5 m and 2.8 m). It was found that crown diameter varied from 1.7 m to 4.0 m for 2017–2020 on average for three cultivars, stem circumference was higher in the cultivars ‘Zimniy shafran’ (52.7 cm) and ‘Renet Simirenko’ (65.6 cm), the lowest indicators were observed in the spur cultivar ‘Starkrimson’, on the rootstock M4. Studies have shown that the intensity of growth and development depends on the environmental conditions and biological characteristics of the cultivars. In this regard, the advantage should be given to the cultivars that are resistant to low temperatures and other adverse environmental factors, as well as contributing to the fullest realization of the modern cultivation technologies. The results of the research can be used to create highly adaptive apple orchards in order to expand the assortment in the conditions of the south of Russia.