According to the results of the conducted studies, it was found that when using the plant growth stimulator β-indolyl-3-butyric acid (IBA) (50 mg/l), the pear varieties Feeria and Svetlyanka (сontrol) had the highest rooting result 77.8 and 70.1 %. Without the use of a plant growth stimulator, the most rooting ability was characterized by the varieties of pears Feeria and Svetlyanka – 65.3 and 60.8 % respectively. As a result of the conducted studies, it was found that the highest growth height using the plant growth stimulator was characterized by the varieties of pear Severyanka krasnoshhekaya and Svetlyanka – 16.0 and 16.7 cm respectively. When using a plant growth stimulator, the pear varieties Svetlyanka and Severyanka krasnoshhekaya had the largest number of roots, this indicator varied between 5.3 pcs. and 5.9 pcs. The best result of the diameter of the conditional root neck when using a plant growth stimulator was obtained by the pear varieties Svetlyanka and Severyanka krasnoschekaya, this indicator was 1.3 cm. Without the use of a plant growth stimulator, the highest plant height was characterized by the pear varieties Severyanka krasnoschekaya and Svetlyanka, this indicator was 15.0 and 15.5 cm respectively. The largest root length without the use of a plant growth stimulator was possessed by the pear varieties Severyanka krasnoschekaya and Svetlyanka, this indicator was 11.0 and 11.1 cm respectively. Without treatment with a plant growth stimulant, the pear varieties Svetlyanka and Severyanka krasnoschekaya had the largest number of roots, 4.5 and 4.1 pcs respectively. The largest diameter of the conditional root neck of 1.1 cm was possessed by pear varieties Svetlyanka and Severyanka krasnoschekaya.

Zatsepina Ilona V.

1. Puchkin I. A., Semeikina V. M., Deisling D. I. Prigodnost' plodov razlichnykh sortoobraztsov grushi k pererabotke [Suitability of fruits of various varieties of pears for processing]. Dostizheniya nauki i tekhniki APK. – Achievement of Science and Technology of the Agro-industrial complex, 2016; 30; 9: 102–104 (in Russ.).
2. Barabash I. P., Zheludkov I. A., Zheludkov A. I. Proizvodstvenno-biologicheskaya otsenka sortov grushi na podvoe VA-29 [Production and biological evaluation of pear varieties on the stock VA-29]. Vestnik APK Stavropol'ya. – Bulletin of Agroindustrial complex Stavropol, 2016; 1 (21): 159–162 (in Russ.).
3. Ermolenko V. G., Apolokhov F. F., Mozhar N. V. Perspektivy vyrashchivaniya grushi v tsentral'nom Predkavkaz'e [Prospects of pear cultivation in the Central Caucasus]. Plodovodstvo i vinogradarstvo Yuga Rossii. – Fruit growing and viticulture in the South of Russia, 2020; 66(6): 284–294 (in Russ.).
4. Zhao X., Zheng H., Li Sh. The rooting of poplar cuttings: a review. New Forests International Journal on the Biology, Biotechnology, and Management of Afforestation and Reforestation, 2014; 45 (1): 21–34.
5. Nigmatyanova S. E., Mursalimova G. R. Deistvie preparatov Tsirkon i Ribav-Ekstra na protsessy rizogeneza zelenykh cherenkov dekorativnykh kul'tur [The effect of Zircon and Ribav-Extra preparations on the processes of rhizogenesis of green cuttings of ornamental crops]. Plodovodstvo i yagodovodstvo Rossii. – Fruit and berry growing in Russia, 2017; XLIX:253–256 (in Russ.).
6. Kumar S., Sharma A., Sharma V. K., Rosin K. G., Kumar D. Enhancement of apple (malus domestica) productivity and soil health through organic fertilization and bio-inoculants under north-western himalayan region of India. Indian Journal of Agricultural Sciences, 2018; 88(9): 1463–1468.
7. Mursalimova G. R. Ekologo-fiziologicheskie aspekty vliyaniya gumatov na rost i razvitie sazhentsev yabloni [Ecological and physiological aspects of the influence of humates on the growth and development of apple seedlings]. Plodovodstvo i yagodovodstvo Rossii. – Fruit and berry growing in Russia, 2016; 46: 268–272 (in Russ.).
8. Okunlola A. I. Effect of growth promoting substances on selected three ornamental plants. Advances in Crop Science and Technology, 2016; 4 (3): 222.
9. Singh A., Naithani S., Balodi Kh. N. Effects of plant growth hormones on Populus deltoides Bartram ex Marshall. An important species having potential in agro-forestry. Journal of Studies in Dynamics and Change, 2015; 2 (2): 344–349.
10. Ereisli S., Esitken A., Orhan E. Rootstocks used for temperate fruit trees in Turkey: an overview. Sodininkyste ir Darzininkyste, 2006; 25; 3: 27–33.
11. Maarri K., Haddad S., Fallouh I. Al Selections of Pyrus syriaca as promising rootstocks for pear cultivars. Acta Horticulturae, 2007; 104: 217–220.
12. Kovalenko N. N. Vyrashchivanie posadochnogo materiala sadovykh kul'tur s ispol'zovaniem zelenogo cherenkovaniya: metodicheskie rekomendatsii [Cultivation of planting material of garden crops with the use of green cuttings: methodological recommendations], Krasnodar, Severo-Kavkazskij NII sadovodstva i vinogradarstva, 2011, 54 p. (in Russ.).